diff options
| -rw-r--r-- | config.h.in | 3 | ||||
| -rwxr-xr-x | configure | 59 | ||||
| -rw-r--r-- | configure.ac | 21 | ||||
| -rw-r--r-- | include/libc-symbols.h | 14 | ||||
| -rw-r--r-- | libio/Makefile | 28 | ||||
| -rw-r--r-- | libio/tst-cleanup-default-static.c | 1 | ||||
| -rw-r--r-- | libio/tst-cleanup-default.c | 1 | ||||
| -rw-r--r-- | libio/tst-cleanup-nostart-stop-gc-static.c | 1 | ||||
| -rw-r--r-- | libio/tst-cleanup-nostart-stop-gc.c | 1 | ||||
| -rw-r--r-- | libio/tst-cleanup-start-stop-gc-static.c | 1 | ||||
| -rw-r--r-- | libio/tst-cleanup-start-stop-gc.c | 1 | ||||
| -rw-r--r-- | libio/tst-cleanup.c | 34 | ||||
| -rw-r--r-- | libio/tst-cleanup.exp | 1 |
13 files changed, 162 insertions, 4 deletions
diff --git a/config.h.in b/config.h.in index ca1547ae67..96a08c7757 100644 --- a/config.h.in +++ b/config.h.in @@ -187,6 +187,9 @@ /* Define if gcc supports attribute ifunc. */ #undef HAVE_GCC_IFUNC +/* Define if CC supports attribute retain. */ +#undef HAVE_GNU_RETAIN + /* Define if the linker defines __ehdr_start. */ #undef HAVE_EHDR_START @@ -4105,6 +4105,31 @@ fi $as_echo "$libc_cv_textrel_ifunc" >&6; } +# Check if CC supports attribute retain as it is used in attribute_used_retain macro. +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for GNU attribute retain support" >&5 +$as_echo_n "checking for GNU attribute retain support... " >&6; } +if ${libc_cv_gnu_retain+:} false; then : + $as_echo_n "(cached) " >&6 +else + cat > conftest.c <<EOF +static int var __attribute__ ((used, retain, section ("__libc_atexit"))); +EOF +libc_cv_gnu_retain=no +if ${CC-cc} -Werror -c conftest.c -o /dev/null 1>&5 \ + 2>&5 ; then + libc_cv_gnu_retain=yes +fi +rm -f conftest* +fi +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_gnu_retain" >&5 +$as_echo "$libc_cv_gnu_retain" >&6; } +if test $libc_cv_gnu_retain = yes; then + $as_echo "#define HAVE_GNU_RETAIN 1" >>confdefs.h + +fi +config_vars="$config_vars +have-gnu-retain = $libc_cv_gnu_retain" + # Check if gcc warns about alias for function with incompatible types. { $as_echo "$as_me:${as_lineno-$LINENO}: checking if compiler warns about alias for function with incompatible types" >&5 $as_echo_n "checking if compiler warns about alias for function with incompatible types... " >&6; } @@ -5871,6 +5896,40 @@ fi $as_echo "$libc_linker_feature" >&6; } +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for linker that supports -z start-stop-gc" >&5 +$as_echo_n "checking for linker that supports -z start-stop-gc... " >&6; } +libc_linker_feature=no +if test x"$gnu_ld" = x"yes"; then + libc_linker_check=`$LD -v --help 2>/dev/null | grep "\-z start-stop-gc"` + if test -n "$libc_linker_check"; then + cat > conftest.c <<EOF +int _start (void) { return 42; } +EOF + if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp + -Wl,-z,start-stop-gc -nostdlib -nostartfiles + -fPIC -shared -o conftest.so conftest.c + 1>&5' + { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 + (eval $ac_try) 2>&5 + ac_status=$? + $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 + test $ac_status = 0; }; } + then + libc_linker_feature=yes + fi + rm -f conftest* + fi +fi +if test $libc_linker_feature = yes; then + libc_cv_z_start_stop_gc=yes +else + libc_cv_z_start_stop_gc=no +fi +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_linker_feature" >&5 +$as_echo "$libc_linker_feature" >&6; } +config_vars="$config_vars +have-z-start-stop-gc = $libc_cv_z_start_stop_gc" + { $as_echo "$as_me:${as_lineno-$LINENO}: checking for linker that supports --no-dynamic-linker" >&5 $as_echo_n "checking for linker that supports --no-dynamic-linker... " >&6; } libc_linker_feature=no diff --git a/configure.ac b/configure.ac index fce967f2c2..cc47e56e82 100644 --- a/configure.ac +++ b/configure.ac @@ -707,6 +707,23 @@ fi rm -f conftest*]) AC_SUBST(libc_cv_textrel_ifunc) +# Check if CC supports attribute retain as it is used in attribute_used_retain macro. +AC_CACHE_CHECK([for GNU attribute retain support], + libc_cv_gnu_retain, [dnl +cat > conftest.c <<EOF +static int var __attribute__ ((used, retain, section ("__libc_atexit"))); +EOF +libc_cv_gnu_retain=no +if ${CC-cc} -Werror -c conftest.c -o /dev/null 1>&AS_MESSAGE_LOG_FD \ + 2>&AS_MESSAGE_LOG_FD ; then + libc_cv_gnu_retain=yes +fi +rm -f conftest*]) +if test $libc_cv_gnu_retain = yes; then + AC_DEFINE(HAVE_GNU_RETAIN) +fi +LIBC_CONFIG_VAR([have-gnu-retain], [$libc_cv_gnu_retain]) + # Check if gcc warns about alias for function with incompatible types. AC_CACHE_CHECK([if compiler warns about alias for function with incompatible types], libc_cv_gcc_incompatible_alias, [dnl @@ -1317,6 +1334,10 @@ LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack], [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no]) AC_SUBST(libc_cv_z_execstack) +LIBC_LINKER_FEATURE([-z start-stop-gc], [-Wl,-z,start-stop-gc], + [libc_cv_z_start_stop_gc=yes], [libc_cv_z_start_stop_gc=no]) +LIBC_CONFIG_VAR([have-z-start-stop-gc], [$libc_cv_z_start_stop_gc]) + LIBC_LINKER_FEATURE([--no-dynamic-linker], [-Wl,--no-dynamic-linker], [libc_cv_no_dynamic_linker=yes], diff --git a/include/libc-symbols.h b/include/libc-symbols.h index 546fc26a7b..127ea656c2 100644 --- a/include/libc-symbols.h +++ b/include/libc-symbols.h @@ -352,6 +352,12 @@ for linking") */ +#ifdef HAVE_GNU_RETAIN +# define attribute_used_retain __attribute__ ((__used__, __retain__)) +#else +# define attribute_used_retain __attribute__ ((__used__)) +#endif + /* Symbol set support macros. */ /* Make SYMBOL, which is in the text segment, an element of SET. */ @@ -367,12 +373,12 @@ for linking") /* When building a shared library, make the set section writable, because it will need to be relocated at run time anyway. */ # define _elf_set_element(set, symbol) \ - static const void *__elf_set_##set##_element_##symbol##__ \ - __attribute__ ((used, section (#set))) = &(symbol) + static const void *__elf_set_##set##_element_##symbol##__ \ + attribute_used_retain __attribute__ ((section (#set))) = &(symbol) #else # define _elf_set_element(set, symbol) \ - static const void *const __elf_set_##set##_element_##symbol##__ \ - __attribute__ ((used, section (#set))) = &(symbol) + static const void *const __elf_set_##set##_element_##symbol##__ \ + attribute_used_retain __attribute__ ((section (#set))) = &(symbol) #endif /* Define SET as a symbol set. This may be required (it is in a.out) to diff --git a/libio/Makefile b/libio/Makefile index 12ce41038f..ed0ce4ee81 100644 --- a/libio/Makefile +++ b/libio/Makefile @@ -195,6 +195,26 @@ ifeq (yes,$(build-shared)) tests-special += $(objpfx)tst-fopenloc-cmp.out $(objpfx)tst-fopenloc-mem.out \ $(objpfx)tst-bz24228-mem.out endif + +tests += tst-cleanup-default tst-cleanup-default-static +tests-static += tst-cleanup-default-static +tests-special += $(objpfx)tst-cleanup-default-cmp.out $(objpfx)tst-cleanup-default-static-cmp.out +LDFLAGS-tst-cleanup-default = -Wl,--gc-sections +LDFLAGS-tst-cleanup-default-static = -Wl,--gc-sections + +ifeq ($(have-gnu-retain)$(have-z-start-stop-gc),yesyes) +tests += tst-cleanup-start-stop-gc tst-cleanup-start-stop-gc-static \ + tst-cleanup-nostart-stop-gc tst-cleanup-nostart-stop-gc-static +tests-static += tst-cleanup-start-stop-gc-static tst-cleanup-nostart-stop-gc-static +tests-special += $(objpfx)tst-cleanup-start-stop-gc-cmp.out \ + $(objpfx)tst-cleanup-start-stop-gc-static-cmp.out \ + $(objpfx)tst-cleanup-nostart-stop-gc-cmp.out \ + $(objpfx)tst-cleanup-nostart-stop-gc-static-cmp.out +LDFLAGS-tst-cleanup-start-stop-gc := -Wl,--gc-sections,-z,start-stop-gc +LDFLAGS-tst-cleanup-start-stop-gc-static := -Wl,--gc-sections,-z,start-stop-gc +LDFLAGS-tst-cleanup-nostart-stop-gc := -Wl,--gc-sections,-z,nostart-stop-gc +LDFLAGS-tst-cleanup-nostart-stop-gc-static := -Wl,--gc-sections,-z,nostart-stop-gc +endif endif include ../Rules @@ -224,6 +244,14 @@ $(objpfx)tst_wprintf2.out: $(gen-locales) $(objpfx)tst-wfile-sync.out: $(gen-locales) endif +define gen-tst-cleanup +$(objpfx)tst-cleanup-$1-cmp.out: tst-cleanup.exp $(objpfx)tst-cleanup-$1.out + cmp $$^ > $$@; $$(evaluate-test) +endef + +$(foreach t,default default-static start-stop-gc start-stop-gc-static nostart-stop-gc nostart-stop-gc-static, \ + $(eval $(call gen-tst-cleanup,$(t)))) + $(objpfx)test-freopen.out: test-freopen.sh $(objpfx)test-freopen $(SHELL) $< $(common-objpfx) '$(test-program-prefix)' \ $(common-objpfx)libio/; \ diff --git a/libio/tst-cleanup-default-static.c b/libio/tst-cleanup-default-static.c new file mode 100644 index 0000000000..c39956e2a8 --- /dev/null +++ b/libio/tst-cleanup-default-static.c @@ -0,0 +1 @@ +#include "tst-cleanup.c" diff --git a/libio/tst-cleanup-default.c b/libio/tst-cleanup-default.c new file mode 100644 index 0000000000..c39956e2a8 --- /dev/null +++ b/libio/tst-cleanup-default.c @@ -0,0 +1 @@ +#include "tst-cleanup.c" diff --git a/libio/tst-cleanup-nostart-stop-gc-static.c b/libio/tst-cleanup-nostart-stop-gc-static.c new file mode 100644 index 0000000000..c39956e2a8 --- /dev/null +++ b/libio/tst-cleanup-nostart-stop-gc-static.c @@ -0,0 +1 @@ +#include "tst-cleanup.c" diff --git a/libio/tst-cleanup-nostart-stop-gc.c b/libio/tst-cleanup-nostart-stop-gc.c new file mode 100644 index 0000000000..c39956e2a8 --- /dev/null +++ b/libio/tst-cleanup-nostart-stop-gc.c @@ -0,0 +1 @@ +#include "tst-cleanup.c" diff --git a/libio/tst-cleanup-start-stop-gc-static.c b/libio/tst-cleanup-start-stop-gc-static.c new file mode 100644 index 0000000000..c39956e2a8 --- /dev/null +++ b/libio/tst-cleanup-start-stop-gc-static.c @@ -0,0 +1 @@ +#include "tst-cleanup.c" diff --git a/libio/tst-cleanup-start-stop-gc.c b/libio/tst-cleanup-start-stop-gc.c new file mode 100644 index 0000000000..c39956e2a8 --- /dev/null +++ b/libio/tst-cleanup-start-stop-gc.c @@ -0,0 +1 @@ +#include "tst-cleanup.c" diff --git a/libio/tst-cleanup.c b/libio/tst-cleanup.c new file mode 100644 index 0000000000..837feac164 --- /dev/null +++ b/libio/tst-cleanup.c @@ -0,0 +1,34 @@ +/* Copyright (C) 2021 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +/* Test that stdout is flushed after atexit callbacks were run, even if the + * executable is linked with --gc-sections. */ + +#include <stdio.h> +#include <stdlib.h> + +void +hook (void) +{ + puts ("hello"); +} + +int +main (void) +{ + atexit (hook); +} diff --git a/libio/tst-cleanup.exp b/libio/tst-cleanup.exp new file mode 100644 index 0000000000..ce01362503 --- /dev/null +++ b/libio/tst-cleanup.exp @@ -0,0 +1 @@ +hello |