* sysdeps/i386/dl-machine.h (RTLD_START): Set __libc_stack_end before

calling _dl_start, using GOTOFF access. * configure.in (libc_cv_z_execstack): New check. * configure: Regenerated. * config.make.in (have-z-execstack): New variable set by it. * elf/tst-execstack.c: New file. * elf/tst-execstack-mod.c: New file. * elf/tst-execstack-needed.c: New file. * elf/Makefile (tests-execstack-yes, modules-execstack-yes): New variables. (tests, modules-names): Conditionally include them. (distribute): Add tst-execstack-mod.c here. ($(objpfx)tst-execstack, $(objpfx)tst-execstack.out): New targets. (LDFLAGS-tst-execstack, LDFLAGS-tst-execstack-mod): New variables. ($(objpfx)tst-execstack-needed): New target. (LDFLAGS-tst-execstack-needed): New variable. * sysdeps/generic/ldsodefs.h (struct rtld_global): Add _dl_stack_flags and _dl_make_stack_executable_hook. Declare _dl_make_stack_executable. * elf/rtld.c (_rtld_global): Add initializer for _dl_stack_flags. (dl_main): Reset _dl_stack_flags according to PT_GNU_STACK phdr. Initialize _dl_make_stack_executable_hook. * elf/dl-support.c: Define those new variables. (_dl_non_dynamic_init): Scan phdrs for PT_GNU_STACK. (_dl_phdr): Fix type. * elf/dl-load.c (_dl_map_object_from_fd): Grok PT_GNU_STACK phdr and enable execute permission for the stack if necessary. * sysdeps/generic/dl-execstack.c: New file. * elf/Makefile (dl-routines): Add it. * elf/Versions (ld: GLIBC_PRIVATE): Add _dl_make_stack_executable. * sysdeps/unix/sysv/linux/dl-execstack.c: New file.
author: Roland McGrath <roland@gnu.org> 2003-09-23 12:07:26 +0000
committer: Roland McGrath <roland@gnu.org> 2003-09-23 12:07:26 +0000
commit: 2abf9ff11384a47dc456c138a8faf6b1469aac2b (patch)
tree: d0ccba6b9bf3096c8d1d2d209984bf4d28597408
parent: ecdeaac05f73c29eca92eecd55ad4fb8513c7771 (diff)
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9 files changed, 683 insertions, 146 deletions
diff --git a/ChangeLog b/ChangeLog
index c05bc4ebe2..528df36a49 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,38 @@
+2003-09-23  Roland McGrath  <roland@redhat.com>
+
+	* sysdeps/i386/dl-machine.h (RTLD_START): Set __libc_stack_end before
+	calling _dl_start, using GOTOFF access.
+
+	* configure.in (libc_cv_z_execstack): New check.
+	* configure: Regenerated.
+	* config.make.in (have-z-execstack): New variable set by it.
+	* elf/tst-execstack.c: New file.
+	* elf/tst-execstack-mod.c: New file.
+	* elf/tst-execstack-needed.c: New file.
+	* elf/Makefile (tests-execstack-yes, modules-execstack-yes): New
+	variables.
+	(tests, modules-names): Conditionally include them.
+	(distribute): Add tst-execstack-mod.c here.
+	($(objpfx)tst-execstack, $(objpfx)tst-execstack.out): New targets.
+	(LDFLAGS-tst-execstack, LDFLAGS-tst-execstack-mod): New variables.
+	($(objpfx)tst-execstack-needed): New target.
+	(LDFLAGS-tst-execstack-needed): New variable.
+
+	* sysdeps/generic/ldsodefs.h (struct rtld_global): Add _dl_stack_flags
+	and _dl_make_stack_executable_hook.  Declare _dl_make_stack_executable.
+	* elf/rtld.c (_rtld_global): Add initializer for _dl_stack_flags.
+	(dl_main): Reset _dl_stack_flags according to PT_GNU_STACK phdr.
+	Initialize _dl_make_stack_executable_hook.
+	* elf/dl-support.c: Define those new variables.
+	(_dl_non_dynamic_init): Scan phdrs for PT_GNU_STACK.
+	(_dl_phdr): Fix type.
+	* elf/dl-load.c (_dl_map_object_from_fd): Grok PT_GNU_STACK phdr and
+	enable execute permission for the stack if necessary.
+	* sysdeps/generic/dl-execstack.c: New file.
+	* elf/Makefile (dl-routines): Add it.
+	* elf/Versions (ld: GLIBC_PRIVATE): Add _dl_make_stack_executable.
+	* sysdeps/unix/sysv/linux/dl-execstack.c: New file.
+
 2003-09-23  Ulrich Drepper  <drepper@redhat.com>
 
 	* sysdeps/posix/sprofil.c (pc_to_index): Remove inline marker.
diff --git a/config.make.in b/config.make.in
index 71ccf7131a..21d01f9bc6 100644
--- a/config.make.in
+++ b/config.make.in
@@ -42,6 +42,7 @@ have-z-nodelete = @libc_cv_z_nodelete@
 have-z-nodlopen = @libc_cv_z_nodlopen@
 have-z-initfirst = @libc_cv_z_initfirst@
 have-z-combreloc = @libc_cv_z_combreloc@
+have-z-execstack = @libc_cv_z_execstack@
 have-initfini = @libc_cv_have_initfini@
 have-Bgroup = @libc_cv_Bgroup@
 need-nopic-initfini = @nopic_initfini@
diff --git a/configure b/configure
index 2087db5046..6f8d6c8dce 100755
--- a/configure
+++ b/configure
@@ -1,7 +1,7 @@
 #! /bin/sh
 # From configure.in CVSid.
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.54 for GNU C Library (see version.h).
+# Generated by GNU Autoconf 2.57 for GNU C Library (see version.h).
 #
 # Report bugs to <glibc>.
 #
@@ -39,7 +39,10 @@ PS2='> '
 PS4='+ '
 
 # NLS nuisances.
-for as_var in LANG LANGUAGE LC_ALL LC_COLLATE LC_CTYPE LC_NUMERIC LC_MESSAGES LC_TIME
+for as_var in \
+  LANG LANGUAGE LC_ADDRESS LC_ALL LC_COLLATE LC_CTYPE LC_IDENTIFICATION \
+  LC_MEASUREMENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER \
+  LC_TELEPHONE LC_TIME
 do
   if (set +x; test -n "`(eval $as_var=C; export $as_var) 2>&1`"); then
     eval $as_var=C; export $as_var
@@ -85,15 +88,15 @@ as_cr_alnum=$as_cr_Letters$as_cr_digits
 
 # The user is always right.
 if test "${PATH_SEPARATOR+set}" != set; then
-  echo "#! /bin/sh" >conftest.sh
-  echo  "exit 0"   >>conftest.sh
-  chmod +x conftest.sh
-  if (PATH="/nonexistent;."; conftest.sh) >/dev/null 2>&1; then
+  echo "#! /bin/sh" >conf$$.sh
+  echo  "exit 0"   >>conf$$.sh
+  chmod +x conf$$.sh
+  if (PATH="/nonexistent;."; conf$$.sh) >/dev/null 2>&1; then
     PATH_SEPARATOR=';'
   else
     PATH_SEPARATOR=:
   fi
-  rm -f conftest.sh
+  rm -f conf$$.sh
 fi
 
 
@@ -309,7 +312,7 @@ ac_includes_default="\
 # include <unistd.h>
 #endif"
 
-ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS with_fp with_cvs enable_check_abi oldest_abi subdirs force_install all_warnings build build_cpu build_vendor build_os host host_cpu host_vendor host_os base_machine sysnames INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA LN_S CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC OBJEXT BUILD_CC cross_compiling CPP CXX CXXFLAGS ac_ct_CXX AR OBJDUMP RANLIB ac_ct_RANLIB MIG AS LD PWD_P MAKE MSGFMT MAKEINFO SED AUTOCONF CCVERSION SYSINCLUDES libc_cv_gcc_static_libgcc BASH libc_cv_have_bash2 KSH libc_cv_have_ksh AWK PERL INSTALL_INFO OLD_DEBIAN_INSTALL_INFO BISON VERSIONING libc_cv_asm_protected_directive libc_cv_initfinit_array libc_cv_z_nodelete libc_cv_z_nodlopen libc_cv_z_initfirst libc_cv_Bgroup ASFLAGS_config libc_cv_z_combreloc libc_cv_have_initfini libc_cv_cpp_asm_debuginfo no_whole_archive exceptions LIBGD EGREP sizeof_long_double libc_cv_gcc_unwind_find_fde uname_sysname uname_release uname_version old_glibc_headers libc_cv_slibdir libc_cv_localedir libc_cv_sysconfdir libc_cv_rootsbindir libc_cv_forced_unwind use_ldconfig ldd_rewrite_script gnu_ld gnu_as elf xcoff static shared pic_default profile omitfp bounded static_nss nopic_initfini DEFINES linux_doors mach_interface_list VERSION RELEASE LIBOBJS LTLIBOBJS'
+ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS with_fp with_cvs enable_check_abi oldest_abi subdirs force_install all_warnings build build_cpu build_vendor build_os host host_cpu host_vendor host_os base_machine sysnames INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA LN_S CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC OBJEXT BUILD_CC cross_compiling CPP CXX CXXFLAGS ac_ct_CXX AR OBJDUMP RANLIB ac_ct_RANLIB MIG AS LD PWD_P MAKE MSGFMT MAKEINFO SED AUTOCONF CCVERSION SYSINCLUDES libc_cv_gcc_static_libgcc BASH libc_cv_have_bash2 KSH libc_cv_have_ksh AWK PERL INSTALL_INFO OLD_DEBIAN_INSTALL_INFO BISON VERSIONING libc_cv_asm_protected_directive libc_cv_initfinit_array libc_cv_z_nodelete libc_cv_z_nodlopen libc_cv_z_initfirst libc_cv_Bgroup ASFLAGS_config libc_cv_z_combreloc libc_cv_z_execstack libc_cv_have_initfini libc_cv_cpp_asm_debuginfo no_whole_archive exceptions LIBGD EGREP sizeof_long_double libc_cv_gcc_unwind_find_fde uname_sysname uname_release uname_version old_glibc_headers libc_cv_slibdir libc_cv_localedir libc_cv_sysconfdir libc_cv_rootsbindir libc_cv_forced_unwind use_ldconfig ldd_rewrite_script gnu_ld gnu_as elf xcoff static shared pic_default profile omitfp bounded static_nss nopic_initfini DEFINES linux_doors mach_interface_list VERSION RELEASE LIBOBJS LTLIBOBJS'
 ac_subst_files=''
 
 # Initialize some variables set by options.
@@ -976,7 +979,7 @@ test -n "$ac_init_help" && exit 0
 if $ac_init_version; then
   cat <<\_ACEOF
 GNU C Library configure (see version.h)
-generated by GNU Autoconf 2.54
+generated by GNU Autoconf 2.57
 
 Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002
 Free Software Foundation, Inc.
@@ -991,7 +994,7 @@ This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
 It was created by GNU C Library $as_me (see version.h), which was
-generated by GNU Autoconf 2.54.  Invocation command line was
+generated by GNU Autoconf 2.57.  Invocation command line was
 
   $ $0 $@
 
@@ -1043,24 +1046,54 @@ _ACEOF
 
 # Keep a trace of the command line.
 # Strip out --no-create and --no-recursion so they do not pile up.
+# Strip out --silent because we don't want to record it for future runs.
 # Also quote any args containing shell meta-characters.
+# Make two passes to allow for proper duplicate-argument suppression.
 ac_configure_args=
+ac_configure_args0=
+ac_configure_args1=
 ac_sep=
-for ac_arg
+ac_must_keep_next=false
+for ac_pass in 1 2
 do
-  case $ac_arg in
-  -no-create | --no-create | --no-creat | --no-crea | --no-cre \
-  | --no-cr | --no-c | -n ) continue ;;
-  -no-recursion | --no-recursion | --no-recursio | --no-recursi \
-  | --no-recurs | --no-recur | --no-recu | --no-rec | --no-re | --no-r)
-    continue ;;
-  *" "*|*"	"*|*[\[\]\~\#\$\^\&\*\(\)\{\}\\\|\;\<\>\?\"\']*)
-    ac_arg=`echo "$ac_arg" | sed "s/'/'\\\\\\\\''/g"` ;;
-  esac
-  ac_configure_args="$ac_configure_args$ac_sep'$ac_arg'"
-  # Get rid of the leading space.
-  ac_sep=" "
+  for ac_arg
+  do
+    case $ac_arg in
+    -no-create | --no-c* | -n | -no-recursion | --no-r*) continue ;;
+    -q | -quiet | --quiet | --quie | --qui | --qu | --q \
+    | -silent | --silent | --silen | --sile | --sil)
+      continue ;;
+    *" "*|*"	"*|*[\[\]\~\#\$\^\&\*\(\)\{\}\\\|\;\<\>\?\"\']*)
+      ac_arg=`echo "$ac_arg" | sed "s/'/'\\\\\\\\''/g"` ;;
+    esac
+    case $ac_pass in
+    1) ac_configure_args0="$ac_configure_args0 '$ac_arg'" ;;
+    2)
+      ac_configure_args1="$ac_configure_args1 '$ac_arg'"
+      if test $ac_must_keep_next = true; then
+        ac_must_keep_next=false # Got value, back to normal.
+      else
+        case $ac_arg in
+          *=* | --config-cache | -C | -disable-* | --disable-* \
+          | -enable-* | --enable-* | -gas | --g* | -nfp | --nf* \
+          | -q | -quiet | --q* | -silent | --sil* | -v | -verb* \
+          | -with-* | --with-* | -without-* | --without-* | --x)
+            case "$ac_configure_args0 " in
+              "$ac_configure_args1"*" '$ac_arg' "* ) continue ;;
+            esac
+            ;;
+          -* ) ac_must_keep_next=true ;;
+        esac
+      fi
+      ac_configure_args="$ac_configure_args$ac_sep'$ac_arg'"
+      # Get rid of the leading space.
+      ac_sep=" "
+      ;;
+    esac
+  done
 done
+$as_unset ac_configure_args0 || test "${ac_configure_args0+set}" != set || { ac_configure_args0=; export ac_configure_args0; }
+$as_unset ac_configure_args1 || test "${ac_configure_args1+set}" != set || { ac_configure_args1=; export ac_configure_args1; }
 
 # When interrupted or exit'd, cleanup temporary files, and complete
 # config.log.  We remove comments because anyway the quotes in there
@@ -2492,8 +2525,10 @@ fi
 fi
 
 
-test -z "$CC" && { { echo "$as_me:$LINENO: error: no acceptable C compiler found in \$PATH" >&5
-echo "$as_me: error: no acceptable C compiler found in \$PATH" >&2;}
+test -z "$CC" && { { echo "$as_me:$LINENO: error: no acceptable C compiler found in \$PATH
+See \`config.log' for more details." >&5
+echo "$as_me: error: no acceptable C compiler found in \$PATH
+See \`config.log' for more details." >&2;}
    { (exit 1); exit 1; }; }
 
 # Provide some information about the compiler.
@@ -2524,7 +2559,11 @@ if test "${ac_cv_objext+set}" = set; then
 else
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 
 int
 main ()
@@ -2549,9 +2588,12 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
 done
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
-{ { echo "$as_me:$LINENO: error: cannot compute suffix of object files: cannot compile" >&5
-echo "$as_me: error: cannot compute suffix of object files: cannot compile" >&2;}
+sed 's/^/| /' conftest.$ac_ext >&5
+
+{ { echo "$as_me:$LINENO: error: cannot compute suffix of object files: cannot compile
+See \`config.log' for more details." >&5
+echo "$as_me: error: cannot compute suffix of object files: cannot compile
+See \`config.log' for more details." >&2;}
    { (exit 1); exit 1; }; }
 fi
 
@@ -2568,7 +2610,11 @@ if test "${ac_cv_c_compiler_gnu+set}" = set; then
 else
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 
 int
 main ()
@@ -2596,7 +2642,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   ac_compiler_gnu=yes
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 ac_compiler_gnu=no
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
@@ -2616,7 +2663,11 @@ if test "${ac_cv_prog_cc_g+set}" = set; then
 else
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 
 int
 main ()
@@ -2641,7 +2692,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   ac_cv_prog_cc_g=yes
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 ac_cv_prog_cc_g=no
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
@@ -2672,7 +2724,11 @@ else
 ac_save_CC=$CC
 cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 #include <stdarg.h>
 #include <stdio.h>
 #include <sys/types.h>
@@ -2735,7 +2791,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
 break
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 fi
 rm -f conftest.$ac_objext
 done
@@ -2786,7 +2843,11 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
 do
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 #include <stdlib.h>
 $ac_declaration
 int
@@ -2812,13 +2873,18 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   :
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 continue
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 $ac_declaration
 int
 main ()
@@ -2843,7 +2909,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   break
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
 done
@@ -2856,7 +2923,8 @@ fi
 
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
 ac_ext=c
@@ -2931,12 +2999,22 @@ for ac_c_preproc_warn_flag in '' yes
 do
   # Use a header file that comes with gcc, so configuring glibc
   # with a fresh cross-compiler works.
+  # Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+  # <limits.h> exists even on freestanding compilers.
   # On the NeXT, cc -E runs the code through the compiler's parser,
   # not just through cpp. "Syntax error" is here to catch this case.
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
-#include <assert.h>
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
                      Syntax error
 _ACEOF
 if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5
@@ -2959,7 +3037,8 @@ if test -z "$ac_cpp_err"; then
   :
 else
   echo "$as_me: failed program was:" >&5
-  cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
   # Broken: fails on valid input.
 continue
 fi
@@ -2969,7 +3048,11 @@ rm -f conftest.err conftest.$ac_ext
   # can be detected and how.
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 #include <ac_nonexistent.h>
 _ACEOF
 if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5
@@ -2993,7 +3076,8 @@ if test -z "$ac_cpp_err"; then
 continue
 else
   echo "$as_me: failed program was:" >&5
-  cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
   # Passes both tests.
 ac_preproc_ok=:
 break
@@ -3022,12 +3106,22 @@ for ac_c_preproc_warn_flag in '' yes
 do
   # Use a header file that comes with gcc, so configuring glibc
   # with a fresh cross-compiler works.
+  # Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+  # <limits.h> exists even on freestanding compilers.
   # On the NeXT, cc -E runs the code through the compiler's parser,
   # not just through cpp. "Syntax error" is here to catch this case.
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
-#include <assert.h>
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
                      Syntax error
 _ACEOF
 if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5
@@ -3050,7 +3144,8 @@ if test -z "$ac_cpp_err"; then
   :
 else
   echo "$as_me: failed program was:" >&5
-  cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
   # Broken: fails on valid input.
 continue
 fi
@@ -3060,7 +3155,11 @@ rm -f conftest.err conftest.$ac_ext
   # can be detected and how.
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 #include <ac_nonexistent.h>
 _ACEOF
 if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5
@@ -3084,7 +3183,8 @@ if test -z "$ac_cpp_err"; then
 continue
 else
   echo "$as_me: failed program was:" >&5
-  cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
   # Passes both tests.
 ac_preproc_ok=:
 break
@@ -3097,8 +3197,10 @@ rm -f conftest.err conftest.$ac_ext
 if $ac_preproc_ok; then
   :
 else
-  { { echo "$as_me:$LINENO: error: C preprocessor \"$CPP\" fails sanity check" >&5
-echo "$as_me: error: C preprocessor \"$CPP\" fails sanity check" >&2;}
+  { { echo "$as_me:$LINENO: error: C preprocessor \"$CPP\" fails sanity check
+See \`config.log' for more details." >&5
+echo "$as_me: error: C preprocessor \"$CPP\" fails sanity check
+See \`config.log' for more details." >&2;}
    { (exit 1); exit 1; }; }
 fi
 
@@ -3229,7 +3331,11 @@ if test "${ac_cv_cxx_compiler_gnu+set}" = set; then
 else
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 
 int
 main ()
@@ -3257,7 +3363,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   ac_compiler_gnu=yes
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 ac_compiler_gnu=no
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
@@ -3277,7 +3384,11 @@ if test "${ac_cv_prog_cxx_g+set}" = set; then
 else
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 
 int
 main ()
@@ -3302,7 +3413,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   ac_cv_prog_cxx_g=yes
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 ac_cv_prog_cxx_g=no
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
@@ -3335,7 +3447,11 @@ for ac_declaration in \
 do
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 #include <stdlib.h>
 $ac_declaration
 int
@@ -3361,13 +3477,18 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   :
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 continue
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 $ac_declaration
 int
 main ()
@@ -3392,7 +3513,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   break
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
 done
@@ -4540,7 +4662,11 @@ if test "${libc_cv_friendly_stddef+set}" = set; then
 else
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 #define __need_size_t
 #define __need_wchar_t
 #include <stddef.h>
@@ -4573,7 +4699,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   libc_cv_friendly_stddef=yes
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 libc_cv_friendly_stddef=no
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
@@ -5260,6 +5387,7 @@ echo "${ECHO_T}$libc_cv_as_noexecstack" >&6
     ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
   fi
 
+
   echo "$as_me:$LINENO: checking for -z combreloc" >&5
 echo $ECHO_N "checking for -z combreloc... $ECHO_C" >&6
 if test "${libc_cv_z_combreloc+set}" = set; then
@@ -5298,8 +5426,36 @@ echo "${ECHO_T}$libc_cv_z_combreloc" >&6
 _ACEOF
 
   fi
+
+
+  echo "$as_me:$LINENO: checking for -z execstack" >&5
+echo $ECHO_N "checking for -z execstack... $ECHO_C" >&6
+if test "${libc_cv_z_execstack+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+    cat > conftest.c <<EOF
+int _start (void) { return 42; }
+EOF
+  if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
+			      -shared -o conftest.so conftest.c
+			      -Wl,-z,execstack -nostdlib
+			      1>&5'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }
+  then
+    libc_cv_z_execstack=yes
+  else
+    libc_cv_z_execstack=no
+  fi
+  rm -f conftest*
 fi
+echo "$as_me:$LINENO: result: $libc_cv_z_execstack" >&5
+echo "${ECHO_T}$libc_cv_z_execstack" >&6
 
+fi
 
 if test $elf != yes; then
   echo "$as_me:$LINENO: checking for .init and .fini sections" >&5
@@ -5309,7 +5465,11 @@ if test "${libc_cv_have_initfini+set}" = set; then
 else
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 
 int
 main ()
@@ -5336,7 +5496,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   libc_cv_have_initfini=yes
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 libc_cv_have_initfini=no
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
@@ -5396,7 +5557,11 @@ if test "${libc_cv_asm_underscores+set}" = set; then
 else
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 asm ("_glibc_foobar:");
 int
 main ()
@@ -5421,7 +5586,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   libc_cv_asm_underscores=yes
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 libc_cv_asm_underscores=no
 fi
 rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext
@@ -5745,7 +5911,11 @@ if test "${libc_cv_c_asmcr0_bug+set}" = set; then
 else
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 int tester(int x) { asm ("" : : : "cc"); return x & 123; }
 int
 main ()
@@ -5770,7 +5940,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   libc_cv_c_asmcr0_bug='no'
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 libc_cv_c_asmcr0_bug='yes'
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
@@ -6098,7 +6269,11 @@ if test "$with_gd" != "no"; then
   LIBS="$LIBS -lgd -lpng -lz -lm"
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 #include <gd.h>
 int
 main ()
@@ -6123,7 +6298,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
   LIBGD=yes
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 LIBGD=no
 fi
 rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext
@@ -6160,43 +6336,54 @@ if test "${ac_cv_header_stdc+set}" = set; then
 else
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 #include <stdlib.h>
 #include <stdarg.h>
 #include <string.h>
 #include <float.h>
 
+int
+main ()
+{
+
+  ;
+  return 0;
+}
 _ACEOF
-if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5
-  (eval $ac_cpp conftest.$ac_ext) 2>conftest.er1
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>&5
   ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } >/dev/null; then
-  if test -s conftest.err; then
-    ac_cpp_err=$ac_c_preproc_warn_flag
-  else
-    ac_cpp_err=
-  fi
-else
-  ac_cpp_err=yes
-fi
-if test -z "$ac_cpp_err"; then
+  (exit $ac_status); } &&
+         { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
   ac_cv_header_stdc=yes
 else
   echo "$as_me: failed program was:" >&5
-  cat conftest.$ac_ext >&5
-  ac_cv_header_stdc=no
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_cv_header_stdc=no
 fi
-rm -f conftest.err conftest.$ac_ext
+rm -f conftest.$ac_objext conftest.$ac_ext
 
 if test $ac_cv_header_stdc = yes; then
   # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 #include <string.h>
 
 _ACEOF
@@ -6214,7 +6401,11 @@ if test $ac_cv_header_stdc = yes; then
   # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 #include <stdlib.h>
 
 _ACEOF
@@ -6235,13 +6426,18 @@ if test $ac_cv_header_stdc = yes; then
 else
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 #include <ctype.h>
 #if ((' ' & 0x0FF) == 0x020)
 # define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
 # define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
 #else
-# define ISLOWER(c) (('a' <= (c) && (c) <= 'i') \
+# define ISLOWER(c) \
+                   (('a' <= (c) && (c) <= 'i') \
                      || ('j' <= (c) && (c) <= 'r') \
                      || ('s' <= (c) && (c) <= 'z'))
 # define TOUPPER(c) (ISLOWER(c) ? ((c) | 0x40) : (c))
@@ -6274,7 +6470,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
 else
   echo "$as_me: program exited with status $ac_status" >&5
 echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 ( exit $ac_status )
 ac_cv_header_stdc=no
 fi
@@ -6313,7 +6510,11 @@ if eval "test \"\${$as_ac_Header+set}\" = set"; then
 else
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 $ac_includes_default
 
 #include <$ac_header>
@@ -6333,7 +6534,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   eval "$as_ac_Header=yes"
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 eval "$as_ac_Header=no"
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
@@ -6357,7 +6559,11 @@ if test "${ac_cv_type_long_double+set}" = set; then
 else
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 $ac_includes_default
 int
 main ()
@@ -6385,7 +6591,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   ac_cv_type_long_double=yes
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 ac_cv_type_long_double=no
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
@@ -6407,7 +6614,11 @@ else
   # Depending upon the size, compute the lo and hi bounds.
 cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 $ac_includes_default
 int
 main ()
@@ -6435,7 +6646,11 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   while :; do
     cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 $ac_includes_default
 int
 main ()
@@ -6462,7 +6677,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   ac_hi=$ac_mid; break
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 ac_lo=`expr $ac_mid + 1`
                     if test $ac_lo -le $ac_mid; then
                       ac_lo= ac_hi=
@@ -6474,10 +6690,15 @@ rm -f conftest.$ac_objext conftest.$ac_ext
   done
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 $ac_includes_default
 int
 main ()
@@ -6505,7 +6726,11 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   while :; do
     cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 $ac_includes_default
 int
 main ()
@@ -6532,7 +6757,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   ac_lo=$ac_mid; break
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 ac_hi=`expr '(' $ac_mid ')' - 1`
                        if test $ac_mid -le $ac_hi; then
                          ac_lo= ac_hi=
@@ -6544,7 +6770,8 @@ rm -f conftest.$ac_objext conftest.$ac_ext
   done
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 ac_lo= ac_hi=
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
@@ -6555,7 +6782,11 @@ while test "x$ac_lo" != "x$ac_hi"; do
   ac_mid=`expr '(' $ac_hi - $ac_lo ')' / 2 + $ac_lo`
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 $ac_includes_default
 int
 main ()
@@ -6582,26 +6813,35 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   ac_hi=$ac_mid
 else
   echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 ac_lo=`expr '(' $ac_mid ')' + 1`
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
 done
 case $ac_lo in
 ?*) ac_cv_sizeof_long_double=$ac_lo;;
-'') { { echo "$as_me:$LINENO: error: cannot compute sizeof (long double), 77" >&5
-echo "$as_me: error: cannot compute sizeof (long double), 77" >&2;}
+'') { { echo "$as_me:$LINENO: error: cannot compute sizeof (long double), 77
+See \`config.log' for more details." >&5
+echo "$as_me: error: cannot compute sizeof (long double), 77
+See \`config.log' for more details." >&2;}
    { (exit 1); exit 1; }; } ;;
 esac
 else
   if test "$cross_compiling" = yes; then
-  { { echo "$as_me:$LINENO: error: cannot run test program while cross compiling" >&5
-echo "$as_me: error: cannot run test program while cross compiling" >&2;}
+  { { echo "$as_me:$LINENO: error: cannot run test program while cross compiling
+See \`config.log' for more details." >&5
+echo "$as_me: error: cannot run test program while cross compiling
+See \`config.log' for more details." >&2;}
    { (exit 1); exit 1; }; }
 else
   cat >conftest.$ac_ext <<_ACEOF
 #line $LINENO "configure"
-#include "confdefs.h"
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
 $ac_includes_default
 long longval () { return (long) (sizeof (long double)); }
 unsigned long ulongval () { return (long) (sizeof (long double)); }
@@ -6649,10 +6889,13 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
 else
   echo "$as_me: program exited with status $ac_status" >&5
 echo "$as_me: failed program was:" >&5
-cat conftest.$ac_ext >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
 ( exit $ac_status )
-{ { echo "$as_me:$LINENO: error: cannot compute sizeof (long double), 77" >&5
-echo "$as_me: error: cannot compute sizeof (long double), 77" >&2;}
+{ { echo "$as_me:$LINENO: error: cannot compute sizeof (long double), 77
+See \`config.log' for more details." >&5
+echo "$as_me: error: cannot compute sizeof (long double), 77
+See \`config.log' for more details." >&2;}
    { (exit 1); exit 1; }; }
 fi
 rm -f core core.* *.core gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
@@ -6951,7 +7194,7 @@ _ACEOF
      t end
      /^ac_cv_env/!s/^\([^=]*\)=\(.*\)$/\1=${\1=\2}/
      : end' >>confcache
-if cmp -s $cache_file confcache; then :; else
+if diff $cache_file confcache >/dev/null 2>&1; then :; else
   if test -w $cache_file; then
     test "x$cache_file" != "x/dev/null" && echo "updating cache $cache_file"
     cat confcache >$cache_file
@@ -7011,6 +7254,8 @@ cat >$CONFIG_STATUS <<_ACEOF
 # configure, is in config.log if it exists.
 
 debug=false
+ac_cs_recheck=false
+ac_cs_silent=false
 SHELL=\${CONFIG_SHELL-$SHELL}
 _ACEOF
 
@@ -7045,7 +7290,10 @@ PS2='> '
 PS4='+ '
 
 # NLS nuisances.
-for as_var in LANG LANGUAGE LC_ALL LC_COLLATE LC_CTYPE LC_NUMERIC LC_MESSAGES LC_TIME
+for as_var in \
+  LANG LANGUAGE LC_ADDRESS LC_ALL LC_COLLATE LC_CTYPE LC_IDENTIFICATION \
+  LC_MEASUREMENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER \
+  LC_TELEPHONE LC_TIME
 do
   if (set +x; test -n "`(eval $as_var=C; export $as_var) 2>&1`"); then
     eval $as_var=C; export $as_var
@@ -7091,15 +7339,15 @@ as_cr_alnum=$as_cr_Letters$as_cr_digits
 
 # The user is always right.
 if test "${PATH_SEPARATOR+set}" != set; then
-  echo "#! /bin/sh" >conftest.sh
-  echo  "exit 0"   >>conftest.sh
-  chmod +x conftest.sh
-  if (PATH="/nonexistent;."; conftest.sh) >/dev/null 2>&1; then
+  echo "#! /bin/sh" >conf$$.sh
+  echo  "exit 0"   >>conf$$.sh
+  chmod +x conf$$.sh
+  if (PATH="/nonexistent;."; conf$$.sh) >/dev/null 2>&1; then
     PATH_SEPARATOR=';'
   else
     PATH_SEPARATOR=:
   fi
-  rm -f conftest.sh
+  rm -f conf$$.sh
 fi
 
 
@@ -7262,7 +7510,7 @@ _ASBOX
 cat >&5 <<_CSEOF
 
 This file was extended by GNU C Library $as_me (see version.h), which was
-generated by GNU Autoconf 2.54.  Invocation command line was
+generated by GNU Autoconf 2.57.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
   CONFIG_HEADERS  = $CONFIG_HEADERS
@@ -7302,6 +7550,7 @@ Usage: $0 [OPTIONS] [FILE]...
 
   -h, --help       print this help, then exit
   -V, --version    print version number, then exit
+  -q, --quiet      do not print progress messages
   -d, --debug      don't remove temporary files
       --recheck    update $as_me by reconfiguring in the same conditions
   --file=FILE[:TEMPLATE]
@@ -7324,7 +7573,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF
 ac_cs_version="\\
 GNU C Library config.status (see version.h)
-configured by $0, generated by GNU Autoconf 2.54,
+configured by $0, generated by GNU Autoconf 2.57,
   with options \\"`echo "$ac_configure_args" | sed 's/[\\""\`\$]/\\\\&/g'`\\"
 
 Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001
@@ -7361,12 +7610,9 @@ do
   case $ac_option in
   # Handling of the options.
 _ACEOF
-cat >>$CONFIG_STATUS <<_ACEOF
-  -recheck | --recheck | --rechec | --reche | --rech | --rec | --re | --r)
-    echo "running $SHELL $0 " $ac_configure_args " --no-create --no-recursion"
-    exec $SHELL $0 $ac_configure_args --no-create --no-recursion ;;
-_ACEOF
 cat >>$CONFIG_STATUS <<\_ACEOF
+  -recheck | --recheck | --rechec | --reche | --rech | --rec | --re | --r)
+    ac_cs_recheck=: ;;
   --version | --vers* | -V )
     echo "$ac_cs_version"; exit 0 ;;
   --he | --h)
@@ -7388,6 +7634,9 @@ Try \`$0 --help' for more information." >&2;}
     $ac_shift
     CONFIG_HEADERS="$CONFIG_HEADERS $ac_optarg"
     ac_need_defaults=false;;
+  -q | -quiet | --quiet | --quie | --qui | --qu | --q \
+  | -silent | --silent | --silen | --sile | --sil | --si | --s)
+    ac_cs_silent=: ;;
 
   # This is an error.
   -*) { { echo "$as_me:$LINENO: error: unrecognized option: $1
@@ -7402,6 +7651,20 @@ Try \`$0 --help' for more information." >&2;}
   shift
 done
 
+ac_configure_extra_args=
+
+if $ac_cs_silent; then
+  exec 6>/dev/null
+  ac_configure_extra_args="$ac_configure_extra_args --silent"
+fi
+
+_ACEOF
+cat >>$CONFIG_STATUS <<_ACEOF
+if \$ac_cs_recheck; then
+  echo "running $SHELL $0 " $ac_configure_args \$ac_configure_extra_args " --no-create --no-recursion" >&6
+  exec $SHELL $0 $ac_configure_args \$ac_configure_extra_args --no-create --no-recursion
+fi
+
 _ACEOF
 
 cat >>$CONFIG_STATUS <<_ACEOF
@@ -7442,6 +7705,9 @@ if $ac_need_defaults; then
   test "${CONFIG_COMMANDS+set}" = set || CONFIG_COMMANDS=$config_commands
 fi
 
+# Have a temporary directory for convenience.  Make it in the build tree
+# simply because there is no reason to put it here, and in addition,
+# creating and moving files from /tmp can sometimes cause problems.
 # Create a temporary directory, and hook for its removal unless debugging.
 $debug ||
 {
@@ -7450,17 +7716,17 @@ $debug ||
 }
 
 # Create a (secure) tmp directory for tmp files.
-: ${TMPDIR=/tmp}
+
 {
-  tmp=`(umask 077 && mktemp -d -q "$TMPDIR/csXXXXXX") 2>/dev/null` &&
+  tmp=`(umask 077 && mktemp -d -q "./confstatXXXXXX") 2>/dev/null` &&
   test -n "$tmp" && test -d "$tmp"
 }  ||
 {
-  tmp=$TMPDIR/cs$$-$RANDOM
+  tmp=./confstat$$-$RANDOM
   (umask 077 && mkdir $tmp)
 } ||
 {
-   echo "$me: cannot create a temporary directory in $TMPDIR" >&2
+   echo "$me: cannot create a temporary directory in ." >&2
    { (exit 1); exit 1; }
 }
 
@@ -7575,6 +7841,7 @@ s,@libc_cv_z_initfirst@,$libc_cv_z_initfirst,;t t
 s,@libc_cv_Bgroup@,$libc_cv_Bgroup,;t t
 s,@ASFLAGS_config@,$ASFLAGS_config,;t t
 s,@libc_cv_z_combreloc@,$libc_cv_z_combreloc,;t t
+s,@libc_cv_z_execstack@,$libc_cv_z_execstack,;t t
 s,@libc_cv_have_initfini@,$libc_cv_have_initfini,;t t
 s,@libc_cv_cpp_asm_debuginfo@,$libc_cv_cpp_asm_debuginfo,;t t
 s,@no_whole_archive@,$no_whole_archive,;t t
@@ -7990,7 +8257,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF
   cat $tmp/in >>$tmp/config.h
   rm -f $tmp/in
   if test x"$ac_file" != x-; then
-    if cmp -s $ac_file $tmp/config.h 2>/dev/null; then
+    if diff $ac_file $tmp/config.h >/dev/null 2>&1; then
       { echo "$as_me:$LINENO: $ac_file is unchanged" >&5
 echo "$as_me: $ac_file is unchanged" >&6;}
     else
@@ -8123,8 +8390,11 @@ ac_clean_files=$ac_clean_files_save
 # need to make the FD available again.
 if test "$no_create" != yes; then
   ac_cs_success=:
+  ac_config_status_args=
+  test "$silent" = yes &&
+    ac_config_status_args="$ac_config_status_args --quiet"
   exec 5>/dev/null
-  $SHELL $CONFIG_STATUS || ac_cs_success=false
+  $SHELL $CONFIG_STATUS $ac_config_status_args || ac_cs_success=false
   exec 5>>config.log
   # Use ||, not &&, to avoid exiting from the if with $? = 1, which
   # would make configure fail if this is the last instruction.
diff --git a/configure.in b/configure.in
index 91d903f591..c3f4adb89d 100644
--- a/configure.in
+++ b/configure.in
@@ -1334,6 +1334,7 @@ EOF
     ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
   fi
   AC_SUBST(ASFLAGS_config)
+
   AC_CACHE_CHECK(for -z combreloc,
 		 libc_cv_z_combreloc, [dnl
   cat > conftest.c <<EOF
@@ -1363,8 +1364,25 @@ dnl look for a section named .rel.dyn.
   if test "$libc_cv_z_combreloc" = yes; then
     AC_DEFINE(HAVE_Z_COMBRELOC)
   fi
+  AC_SUBST(libc_cv_z_combreloc)
+
+  AC_CACHE_CHECK(for -z execstack,
+		 libc_cv_z_execstack, [dnl
+  cat > conftest.c <<EOF
+int _start (void) { return 42; }
+EOF
+  if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
+			      -shared -o conftest.so conftest.c
+			      -Wl,-z,execstack -nostdlib
+			      1>&AS_MESSAGE_LOG_FD])
+  then
+    libc_cv_z_execstack=yes
+  else
+    libc_cv_z_execstack=no
+  fi
+  rm -f conftest*])
+  AC_SUBST(libc_cv_z_execstack)
 fi
-AC_SUBST(libc_cv_z_combreloc)
 
 if test $elf != yes; then
   AC_CACHE_CHECK(for .init and .fini sections, libc_cv_have_initfini,
diff --git a/elf/Makefile b/elf/Makefile
index d5a1c3de34..36f205abb2 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -29,7 +29,8 @@ routines	= $(dl-routines) dl-open dl-close dl-support dl-iteratephdr \
 # profiled libraries.
 dl-routines	= $(addprefix dl-,load cache lookup object reloc deps \
 			          runtime error init fini debug misc \
-				  version profile conflict tls origin)
+				  version profile conflict tls origin \
+				  execstack)
 all-dl-routines = $(dl-routines) $(sysdep-dl-routines)
 # But they are absent from the shared libc, because that code is in ld.so.
 elide-routines.os = $(all-dl-routines) dl-support enbl-secure \
@@ -80,6 +81,7 @@ distribute	:= rtld-Rules \
 		   reldep9.c reldep9mod1.c reldep9mod2.c reldep9mod3.c \
 		   tst-array1.exp tst-array2.exp tst-array4.exp \
 		   tst-array2dep.c \
+		   tst-execstack-mod.c \
 		   check-textrel.c dl-sysdep.h
 
 CFLAGS-dl-runtime.c = -fexceptions -fasynchronous-unwind-tables
@@ -150,12 +152,14 @@ tests += loadtest restest1 preloadtest loadfail multiload origtest resolvfail \
 	 neededtest3 neededtest4 unload2 lateglobal initfirst global \
 	 restest2 next dblload dblunload reldep5 reldep6 reldep7 reldep8 \
 	 circleload1 tst-tls3 tst-tls4 tst-tls5 tst-tls6 tst-tls7 tst-tls8 \
-	 tst-tls10 tst-tls11 tst-tls12 tst-tls13 tst-tls14 tst-align
+	 tst-tls10 tst-tls11 tst-tls12 tst-tls13 tst-tls14 tst-align \
+	 $(tests-execstack-$(have-z-execstack))
 #	 reldep9
 test-srcs = tst-pathopt
 tests-vis-yes = vismain
 tests-nodelete-yes = nodelete nodelete2
 tests-nodlopen-yes = nodlopen nodlopen2
+tests-execstack-yes = tst-execstack tst-execstack-needed
 endif
 modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
 		testobj1_1 failobj constload2 constload3 unloadmod \
@@ -178,7 +182,7 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
 		circlemod3 circlemod3a \
 		reldep8mod1 reldep8mod2 reldep8mod3 \
 		reldep9mod1 reldep9mod2 reldep9mod3 \
-		tst-alignmod
+		tst-alignmod $(modules-execstack-$(have-z-execstack))
 ifeq (yes,$(have-initfini-array))
 modules-names += tst-array2dep
 endif
@@ -186,6 +190,7 @@ modules-vis-yes = vismod1 vismod2 vismod3
 modules-nodelete-yes = nodelmod1 nodelmod2 nodelmod3 nodelmod4 \
 		       nodel2mod1 nodel2mod2 nodel2mod3
 modules-nodlopen-yes = nodlopenmod nodlopenmod2
+modules-execstack-yes = tst-execstack-mod
 extra-objs += $(addsuffix .os,$(strip $(modules-names)))
 # We need this variable to be sure the test modules get the right CPPFLAGS.
 test-extras += $(modules-names)
@@ -660,6 +665,16 @@ $(objpfx)tst-tls9-static: $(common-objpfx)dlfcn/libdl.a
 $(objpfx)tst-tls9-static.out: $(objpfx)tst-tlsmod5.so $(objpfx)tst-tlsmod6.so
 endif
 
+ifeq ($(have-z-execstack),yes)
+$(objpfx)tst-execstack: $(libdl)
+$(objpfx)tst-execstack.out: $(objpfx)tst-execstack-mod.so
+LDFLAGS-tst-execstack = -Wl,-z,noexecstack
+LDFLAGS-tst-execstack-mod = -Wl,-z,execstack
+
+$(objpfx)tst-execstack-needed: $(objpfx)tst-execstack-mod.so
+LDFLAGS-tst-execstack-needed = -Wl,-z,noexecstack
+endif
+
 $(objpfx)tst-array1.out: $(objpfx)tst-array1
 	$(elf-objpfx)$(rtld-installed-name) \
 	  --library-path $(rpath-link)$(patsubst %,:%,$(sysdep-library-path)) \
diff --git a/elf/tst-execstack-mod.c b/elf/tst-execstack-mod.c
new file mode 100644
index 0000000000..038e6550b5
--- /dev/null
+++ b/elf/tst-execstack-mod.c
@@ -0,0 +1,30 @@
+/* Test module for making nonexecutable stacks executable
+   on load of a DSO that requires executable stacks.  */
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void callme (void (*callback) (void));
+
+/* This is a function that makes use of executable stack by
+   using a local function trampoline.  */
+void
+tryme (void)
+{
+  bool ok = false;
+  void callback (void) { ok = true; }
+
+  callme (&callback);
+
+  if (ok)
+    printf ("DSO called ok (local %p, trampoline %p)\n", &ok, &callback);
+  else
+    abort ();
+}
+
+void
+callme (void (*callback) (void))
+{
+  (*callback) ();
+}
diff --git a/elf/tst-execstack-needed.c b/elf/tst-execstack-needed.c
new file mode 100644
index 0000000000..03090f7dd6
--- /dev/null
+++ b/elf/tst-execstack-needed.c
@@ -0,0 +1,36 @@
+/* Test program for making nonexecutable stacks executable
+   on DT_NEEDED load of a DSO that requires executable stacks.  */
+
+#include <dlfcn.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <error.h>
+
+extern void tryme (void);	/* from tst-execstack-mod.so */
+
+static void deeper (void (*f) (void));
+
+static int
+do_test (void)
+{
+  tryme ();
+
+  /* Test that growing the stack region gets new executable pages too.  */
+  deeper (&tryme);
+
+  return 0;
+}
+
+static void
+deeper (void (*f) (void))
+{
+  char stack[1100 * 1024];
+  memfrob (stack, sizeof stack);
+  (*f) ();
+  memfrob (stack, sizeof stack);
+}
+
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
diff --git a/elf/tst-execstack.c b/elf/tst-execstack.c
new file mode 100644
index 0000000000..21eaa9bc90
--- /dev/null
+++ b/elf/tst-execstack.c
@@ -0,0 +1,133 @@
+/* Test program for making nonexecutable stacks executable
+   on load of a DSO that requires executable stacks.  */
+
+#include <dlfcn.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <error.h>
+
+static void
+print_maps (void)
+{
+#if 0
+  char *cmd = NULL;
+  asprintf (&cmd, "cat /proc/%d/maps", getpid ());
+  system (cmd);
+  free (cmd);
+#endif
+}
+
+static void deeper (void (*f) (void));
+
+#if USE_PTHREADS
+# include <pthread.h>
+
+static void *
+tryme_thread (void *f)
+{
+  (*((void (*) (void)) f)) ();
+
+  return 0;
+}
+
+static pthread_barrier_t startup_barrier, go_barrier;
+static void *
+waiter_thread (void *arg)
+{
+  void **f = arg;
+  pthread_barrier_wait (&startup_barrier);
+  pthread_barrier_wait (&go_barrier);
+
+  (*((void (*) (void)) *f)) ();
+
+  return 0;
+}
+#endif
+
+static int
+do_test (void)
+{
+  void *f;
+
+#if USE_PTHREADS
+  /* Create some threads while stacks are nonexecutable.  */
+  #define N 5
+  pthread_t thr[N];
+
+  pthread_barrier_init (&startup_barrier, NULL, N + 1);
+  pthread_barrier_init (&go_barrier, NULL, N + 1);
+
+  for (int i = 0; i < N; ++i)
+    {
+      int rc = pthread_create (&thr[i], NULL, &waiter_thread, &f);
+      if (rc)
+	error (1, rc, "pthread_create");
+    }
+
+  /* Make sure they are all there using their stacks.  */
+  pthread_barrier_wait (&startup_barrier);
+  puts ("threads waiting");
+#endif
+
+  print_maps ();
+
+  /* Loading this module should force stacks to become executable.  */
+  void *h = dlopen ("tst-execstack-mod.so", RTLD_LAZY);
+  if (h == NULL)
+    {
+      printf ("cannot load: %s\n", dlerror ());
+      return 1;
+    }
+
+  f = dlsym (h, "tryme");
+  if (f == NULL)
+    {
+      printf ("symbol not found: %s\n", dlerror ());
+      return 1;
+    }
+
+  /* Test if that really made our stack executable.
+     The `tryme' function should crash if not.  */
+
+  (*((void (*) (void)) f)) ();
+
+  print_maps ();
+
+  /* Test that growing the stack region gets new executable pages too.  */
+  deeper ((void (*) (void)) f);
+
+  print_maps ();
+
+#if USE_PTHREADS
+  /* Test that a fresh thread now gets an executable stack.  */
+  {
+    pthread_t th;
+    int rc = pthread_create (&th, NULL, &tryme_thread, f);
+    if (rc)
+      error (1, rc, "pthread_create");
+  }
+
+  puts ("threads go");
+  /* The existing threads' stacks should have been changed.
+     Let them run to test it.  */
+  pthread_barrier_wait (&go_barrier);
+
+  pthread_exit (0);
+#endif
+
+  return 0;
+}
+
+static void
+deeper (void (*f) (void))
+{
+  char stack[1100 * 1024];
+  memfrob (stack, sizeof stack);
+  (*f) ();
+  memfrob (stack, sizeof stack);
+}
+
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
diff --git a/sysdeps/i386/dl-machine.h b/sysdeps/i386/dl-machine.h
index 34019b89bb..9e84e2c059 100644
--- a/sysdeps/i386/dl-machine.h
+++ b/sysdeps/i386/dl-machine.h
@@ -276,18 +276,17 @@ _dl_runtime_profile:\n\
 .globl _start\n\
 .globl _dl_start_user\n\
 _start:\n\
+	# Point %ebx at the GOT.\n\
+	call 0b\n\
+	addl $_GLOBAL_OFFSET_TABLE_, %ebx\n\
 	# Note that _dl_start gets the parameter in %eax.\n\
 	movl %esp, %eax\n\
+	# Store the highest stack address\n\
+	movl %eax, __libc_stack_end@GOTOFF(%ebx)\n\
 	call _dl_start\n\
 _dl_start_user:\n\
 	# Save the user entry point address in %edi.\n\
 	movl %eax, %edi\n\
-	# Point %ebx at the GOT.\n\
-	call 0b\n\
-	addl $_GLOBAL_OFFSET_TABLE_, %ebx\n\
-	# Store the highest stack address\n\
-	movl __libc_stack_end@GOT(%ebx), %eax\n\
-	movl %esp, (%eax)\n\
 	# See if we were run as a command with the executable file\n\
 	# name as an extra leading argument.\n\
 	movl _dl_skip_args@GOTOFF(%ebx), %eax\n\
author	Roland McGrath <roland@gnu.org>	2003-09-23 12:07:26 +0000
committer	Roland McGrath <roland@gnu.org>	2003-09-23 12:07:26 +0000
commit	2abf9ff11384a47dc456c138a8faf6b1469aac2b (patch)
tree	d0ccba6b9bf3096c8d1d2d209984bf4d28597408
parent	ecdeaac05f73c29eca92eecd55ad4fb8513c7771 (diff)
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