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authorCarlos O'Donell <carlos@systemhalted.org>2016-12-02 15:39:09 -0500
committerCarlos O'Donell <carlos@systemhalted.org>2016-12-02 15:39:09 -0500
commit84aa75162cd5ba73caa76864496fadd2551a5caa (patch)
tree0840bcbc833f69aeaf450a49a2f4bf5048386b45
parent01b23a30b42a90b1ebd882a0d81110a1542e504a (diff)
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Bug 20918 - Building with --enable-nss-crypt fails tst-linkall-static
Some configurations may use NSS cryptographic routines but have no static library for those routines. The following changes allow glibc to be built and tested with --enable-nss-crypt, but without having a static NSS library. At a high level the change does two things: (1) Detect at configure time if static NSS crypto libraries are available. Assumes libfreebl3.a (instead of the existing Fedora libfreebl.a which is incomplete) which matches libfreebl3.so. (2) If static NSS crypto libraries are _not_ available then adjust the way in which we build tst-linkall-static. This includes excluding a reference to crypt and not linking against libcrypt.a, all of which will fail otherwise. Testing assumptions: * Static library is named libfreebl3.a (not libfreebl.a as is currently provided in Fedora), matching libfreebl3.so shared link name. Tested on x86_64 on Fedora with: (a) --enable-nss-crypt, with no static NSS library support: PASS (previous FAIL) (b) --enable-nss-crypt, with faked static NSS library support: PASS (unsupported) * Requires changing elf/Makefile to include a stub /lib64/libfreebl3.a for testing purposes. (c) --disable-nss-crypt: PASS (default) No regressions on x86_64. For details see: https://www.sourceware.org/ml/libc-alpha/2016-11/msg00647.html
-rw-r--r--ChangeLog16
-rw-r--r--config.make.in1
-rwxr-xr-xconfigure29
-rw-r--r--configure.ac14
-rw-r--r--elf/Makefile32
-rw-r--r--elf/tst-linkall-static.c2
6 files changed, 92 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog
index 95b5c7eb1a..e4a41d6a3c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,19 @@
+2016-12-02 Carlos O'Donell <carlos@redhat.com>
+
+ [BZ #20918]
+ * configure.ac: Test for static NSS cryptographic libraries and set
+ libc_cv_static_nss_crypt.
+ * configure: Regenerate.
+ * config.make.in (static-nss-crypt): Define.
+ * elf/Makefile (CFLAGS-tst-linkall-static.c): Define.
+ [ifeq (yesno,$(nss-crypt)$(static-nss-crypt))]
+ (CFLAGS-tst-linkall-static.c): Define.
+ ($(objpfx)tst-linkall-static): Remove libcrypt.a.
+ [ifeq (yesyes,$(nss-crypt)$(static-nss-crypt))]
+ ($(objpfx)tst-linkall-static): Define.
+ [ifeq (no,$(nss-crypt))] ($(objpfx)tst-linkall-static): Define.
+ * elf/tst-linkall-static.c [USE_CRYPT](references): Reference crypt().
+
2016-12-02 Florian Weimer <fweimer@redhat.com>
* elf/Makefile [build-shared] (tests): Add tst-latepthread.
diff --git a/config.make.in b/config.make.in
index 04a8b3ed7f..d2d9b8ab36 100644
--- a/config.make.in
+++ b/config.make.in
@@ -75,6 +75,7 @@ multi-arch = @multi_arch@
mach-interface-list = @mach_interface_list@
nss-crypt = @libc_cv_nss_crypt@
+static-nss-crypt = @libc_cv_static_nss_crypt@
# Configuration options.
build-shared = @shared@
diff --git a/configure b/configure
index d9f8c06bca..5cf3230b56 100755
--- a/configure
+++ b/configure
@@ -665,6 +665,7 @@ add_ons
build_pt_chown
build_nscd
link_obsolete_rpc
+libc_cv_static_nss_crypt
libc_cv_nss_crypt
enable_werror
all_warnings
@@ -3529,6 +3530,7 @@ cannot find NSS headers with lowlevel hash function interfaces" "$LINENO" 5
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
old_LIBS="$LIBS"
+ old_LDFLAGS="$LDFLAGS"
LIBS="$LIBS -lfreebl3"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
@@ -3551,14 +3553,41 @@ cannot link program using lowlevel NSS hash functions" "$LINENO" 5
fi
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
+ # Check to see if there is a static NSS cryptographic library.
+ # If there isn't then we can't link anything with libcrypt.a,
+ # and that might mean disabling some static tests.
+ LDFLAGS="$LDFLAGS -static"
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+typedef int PRBool;
+#include <hasht.h>
+#include <nsslowhash.h>
+int
+main ()
+{
+NSSLOW_Init();
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+ libc_cv_static_nss_crypt=yes
+else
+ libc_cv_static_nss_crypt=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+ conftest$ac_exeext conftest.$ac_ext
+ LDFLAGS="$old_LDFLAGS"
CFLAGS="$old_CFLAGS"
LIBS="$old_LIBS"
else
libc_cv_nss_crypt=no
+ libc_cv_static_nss_crypt=no
fi
+
# Check whether --enable-obsolete-rpc was given.
if test "${enable_obsolete_rpc+set}" = set; then :
enableval=$enable_obsolete_rpc; link_obsolete_rpc=$enableval
diff --git a/configure.ac b/configure.ac
index de0a40f1a7..d719fadeef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -321,6 +321,7 @@ void f (void) { NSSLOW_Init (); }])],
AC_MSG_ERROR([
cannot find NSS headers with lowlevel hash function interfaces]))
old_LIBS="$LIBS"
+ old_LDFLAGS="$LDFLAGS"
LIBS="$LIBS -lfreebl3"
AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
#include <hasht.h>
@@ -329,12 +330,25 @@ cannot find NSS headers with lowlevel hash function interfaces]))
libc_cv_nss_crypt=yes,
AC_MSG_ERROR([
cannot link program using lowlevel NSS hash functions]))
+ # Check to see if there is a static NSS cryptographic library.
+ # If there isn't then we can't link anything with libcrypt.a,
+ # and that might mean disabling some static tests.
+ LDFLAGS="$LDFLAGS -static"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
+#include <hasht.h>
+#include <nsslowhash.h>],
+ [NSSLOW_Init();])],
+ libc_cv_static_nss_crypt=yes,
+ libc_cv_static_nss_crypt=no)
+ LDFLAGS="$old_LDFLAGS"
CFLAGS="$old_CFLAGS"
LIBS="$old_LIBS"
else
libc_cv_nss_crypt=no
+ libc_cv_static_nss_crypt=no
fi
AC_SUBST(libc_cv_nss_crypt)
+AC_SUBST(libc_cv_static_nss_crypt)
AC_ARG_ENABLE([obsolete-rpc],
diff --git a/elf/Makefile b/elf/Makefile
index ebdcbc6ff4..f57927f403 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -337,6 +337,16 @@ $(objpfx)tst-_dl_addr_inside_object: $(objpfx)dl-addr-obj.os
CFLAGS-tst-_dl_addr_inside_object.c += $(PIE-ccflag)
endif
+# By default tst-linkall-static should try to use crypt routines to test
+# static libcrypt use.
+CFLAGS-tst-linkall-static.c = -DUSE_CRYPT=1
+# However, if we are using NSS crypto and we don't have a static
+# library, then we exclude the use of crypt functions in the test.
+# We similarly exclude libcrypt.a from the static link (see below).
+ifeq (yesno,$(nss-crypt)$(static-nss-crypt))
+CFLAGS-tst-linkall-static.c = -DUSE_CRYPT=0
+endif
+
include ../Rules
ifeq (yes,$(build-shared))
@@ -1307,12 +1317,30 @@ $(objpfx)tst-ldconfig-X.out : tst-ldconfig-X.sh $(objpfx)ldconfig
$(objpfx)tst-dlsym-error: $(libdl)
+# Test static linking of all the libraries we can possibly link
+# together. Note that in some configurations this may be less than the
+# complete list of libraries we build but we try to maxmimize this list.
$(objpfx)tst-linkall-static: \
$(common-objpfx)math/libm.a \
- $(common-objpfx)crypt/libcrypt.a \
$(common-objpfx)resolv/libresolv.a \
$(common-objpfx)dlfcn/libdl.a \
$(common-objpfx)login/libutil.a \
$(common-objpfx)rt/librt.a \
$(common-objpfx)resolv/libanl.a \
- $(static-thread-library) \
+ $(static-thread-library)
+
+# If we are using NSS crypto and we have the ability to link statically
+# then we include libcrypt.a, otherwise we leave out libcrypt.a and
+# link as much as we can into the tst-linkall-static test. This assumes
+# that linking with libcrypt.a does everything required to include the
+# static NSS crypto library.
+ifeq (yesyes,$(nss-crypt)$(static-nss-crypt))
+$(objpfx)tst-linkall-static: \
+ $(common-objpfx)crypt/libcrypt.a
+endif
+# If we are not using NSS crypto then we always have the ability to link
+# with libcrypt.a.
+ifeq (no,$(nss-crypt))
+$(objpfx)tst-linkall-static: \
+ $(common-objpfx)crypt/libcrypt.a
+endif
diff --git a/elf/tst-linkall-static.c b/elf/tst-linkall-static.c
index 7a4aaccf58..cc77f0788e 100644
--- a/elf/tst-linkall-static.c
+++ b/elf/tst-linkall-static.c
@@ -32,7 +32,9 @@ void *references[] =
{
&pow, /* libm */
&pthread_create, /* libpthread */
+#if USE_CRYPT
&crypt, /* libcrypt */
+#endif
&res_send, /* libresolv */
&dlopen, /* libdl */
&login, /* libutil */