Revert "PR81358: Enable automatic linking of libatomic."

This reverts commit e2f6ed54f7.
This commit is contained in:
Prathamesh Kulkarni 2024-12-18 22:03:38 +05:30
parent 15dbb0a9ee
commit 17d8a3da25
16 changed files with 16 additions and 231 deletions

View file

@ -656,26 +656,6 @@ lang_env_dependencies = { module=libgcc; no_gcc=true; no_c=true; };
// a dependency on libgcc for native targets to configure.
lang_env_dependencies = { module=libiberty; no_c=true; };
dependencies = { module=configure-target-libbacktrace; on=all-target-libatomic; };
dependencies = { module=configure-target-libgloss; on=all-target-libatomic; };
dependencies = { module=configure-target-newlib; on=all-target-libatomic; };
dependencies = { module=configure-target-libgomp; on=all-target-libatomic; };
dependencies = { module=configure-target-libitm; on=all-target-libatomic; };
dependencies = { module=configure-target-libstdc++v3; on=all-target-libatomic; };
dependencies = { module=configure-target-libsanitizer; on=all-target-libatomic; };
dependencies = { module=configure-target-libvtv; on=all-target-libatomic; };
dependencies = { module=configure-target-libssp; on=all-target-libatomic; };
dependencies = { module=configure-target-libquadmath; on=all-target-libatomic; };
dependencies = { module=configure-target-libgfortran; on=all-target-libatomic; };
dependencies = { module=configure-target-libffi; on=all-target-libatomic; };
dependencies = { module=configure-target-libobjc; on=all-target-libatomic; };
dependencies = { module=configure-target-libada; on=all-target-libatomic; };
dependencies = { module=configure-target-libgm2; on=all-target-libatomic; };
dependencies = { module=configure-target-libgo; on=all-target-libatomic; };
dependencies = { module=configure-target-libgrust; on=all-target-libatomic; };
dependencies = { module=configure-target-libphobos; on=all-target-libatomic; };
dependencies = { module=configure-target-zlib; on=all-target-libatomic; };
dependencies = { module=configure-target-fastjar; on=configure-target-zlib; };
dependencies = { module=all-target-fastjar; on=all-target-zlib; };
dependencies = { module=configure-target-libgo; on=configure-target-libffi; };

View file

@ -242,7 +242,6 @@ HOST_EXPORTS = \
GMPINC="$(HOST_GMPINC)"; export GMPINC; \
ISLLIBS="$(HOST_ISLLIBS)"; export ISLLIBS; \
ISLINC="$(HOST_ISLINC)"; export ISLINC; \
TARGET_CONFIGDIRS="$(TARGET_CONFIGDIRS)"; export TARGET_CONFIGDIRS; \
XGCC_FLAGS_FOR_TARGET="$(XGCC_FLAGS_FOR_TARGET)"; export XGCC_FLAGS_FOR_TARGET; \
@if gcc-bootstrap
$(RPATH_ENVVAR)=`echo "$(TARGET_LIB_PATH)$$$(RPATH_ENVVAR)" | sed 's,::*,:,g;s,^:*,,;s,:*$$,,'`; export $(RPATH_ENVVAR); \
@ -68552,66 +68551,6 @@ all-flex: maybe-all-build-bison
all-flex: maybe-all-m4
all-flex: maybe-all-build-texinfo
all-m4: maybe-all-build-texinfo
configure-target-libbacktrace: maybe-all-target-libatomic
configure-stage1-target-libbacktrace: maybe-all-stage1-target-libatomic
configure-stage2-target-libbacktrace: maybe-all-stage2-target-libatomic
configure-stage3-target-libbacktrace: maybe-all-stage3-target-libatomic
configure-stage4-target-libbacktrace: maybe-all-stage4-target-libatomic
configure-stageprofile-target-libbacktrace: maybe-all-stageprofile-target-libatomic
configure-stagetrain-target-libbacktrace: maybe-all-stagetrain-target-libatomic
configure-stagefeedback-target-libbacktrace: maybe-all-stagefeedback-target-libatomic
configure-stageautoprofile-target-libbacktrace: maybe-all-stageautoprofile-target-libatomic
configure-stageautofeedback-target-libbacktrace: maybe-all-stageautofeedback-target-libatomic
configure-target-libgomp: maybe-all-target-libatomic
configure-stage1-target-libgomp: maybe-all-stage1-target-libatomic
configure-stage2-target-libgomp: maybe-all-stage2-target-libatomic
configure-stage3-target-libgomp: maybe-all-stage3-target-libatomic
configure-stage4-target-libgomp: maybe-all-stage4-target-libatomic
configure-stageprofile-target-libgomp: maybe-all-stageprofile-target-libatomic
configure-stagetrain-target-libgomp: maybe-all-stagetrain-target-libatomic
configure-stagefeedback-target-libgomp: maybe-all-stagefeedback-target-libatomic
configure-stageautoprofile-target-libgomp: maybe-all-stageautoprofile-target-libatomic
configure-stageautofeedback-target-libgomp: maybe-all-stageautofeedback-target-libatomic
configure-target-libsanitizer: maybe-all-target-libatomic
configure-stage1-target-libsanitizer: maybe-all-stage1-target-libatomic
configure-stage2-target-libsanitizer: maybe-all-stage2-target-libatomic
configure-stage3-target-libsanitizer: maybe-all-stage3-target-libatomic
configure-stage4-target-libsanitizer: maybe-all-stage4-target-libatomic
configure-stageprofile-target-libsanitizer: maybe-all-stageprofile-target-libatomic
configure-stagetrain-target-libsanitizer: maybe-all-stagetrain-target-libatomic
configure-stagefeedback-target-libsanitizer: maybe-all-stagefeedback-target-libatomic
configure-stageautoprofile-target-libsanitizer: maybe-all-stageautoprofile-target-libatomic
configure-stageautofeedback-target-libsanitizer: maybe-all-stageautofeedback-target-libatomic
configure-target-libvtv: maybe-all-target-libatomic
configure-stage1-target-libvtv: maybe-all-stage1-target-libatomic
configure-stage2-target-libvtv: maybe-all-stage2-target-libatomic
configure-stage3-target-libvtv: maybe-all-stage3-target-libatomic
configure-stage4-target-libvtv: maybe-all-stage4-target-libatomic
configure-stageprofile-target-libvtv: maybe-all-stageprofile-target-libatomic
configure-stagetrain-target-libvtv: maybe-all-stagetrain-target-libatomic
configure-stagefeedback-target-libvtv: maybe-all-stagefeedback-target-libatomic
configure-stageautoprofile-target-libvtv: maybe-all-stageautoprofile-target-libatomic
configure-stageautofeedback-target-libvtv: maybe-all-stageautofeedback-target-libatomic
configure-target-libphobos: maybe-all-target-libatomic
configure-stage1-target-libphobos: maybe-all-stage1-target-libatomic
configure-stage2-target-libphobos: maybe-all-stage2-target-libatomic
configure-stage3-target-libphobos: maybe-all-stage3-target-libatomic
configure-stage4-target-libphobos: maybe-all-stage4-target-libatomic
configure-stageprofile-target-libphobos: maybe-all-stageprofile-target-libatomic
configure-stagetrain-target-libphobos: maybe-all-stagetrain-target-libatomic
configure-stagefeedback-target-libphobos: maybe-all-stagefeedback-target-libatomic
configure-stageautoprofile-target-libphobos: maybe-all-stageautoprofile-target-libatomic
configure-stageautofeedback-target-libphobos: maybe-all-stageautofeedback-target-libatomic
configure-target-zlib: maybe-all-target-libatomic
configure-stage1-target-zlib: maybe-all-stage1-target-libatomic
configure-stage2-target-zlib: maybe-all-stage2-target-libatomic
configure-stage3-target-zlib: maybe-all-stage3-target-libatomic
configure-stage4-target-zlib: maybe-all-stage4-target-libatomic
configure-stageprofile-target-zlib: maybe-all-stageprofile-target-libatomic
configure-stagetrain-target-zlib: maybe-all-stagetrain-target-libatomic
configure-stagefeedback-target-zlib: maybe-all-stagefeedback-target-libatomic
configure-stageautoprofile-target-zlib: maybe-all-stageautoprofile-target-libatomic
configure-stageautofeedback-target-zlib: maybe-all-stageautofeedback-target-libatomic
configure-target-libgo: maybe-configure-target-libffi
all-target-libgo: maybe-all-target-libffi
configure-target-libphobos: maybe-configure-target-libbacktrace
@ -68739,45 +68678,6 @@ configure-m4: stage_last
@endif gcc-bootstrap
@if gcc-bootstrap
@unless target-libatomic-bootstrap
configure-target-libgloss: maybe-all-target-libatomic
@endunless target-libatomic-bootstrap
@unless target-libatomic-bootstrap
configure-target-newlib: maybe-all-target-libatomic
@endunless target-libatomic-bootstrap
@unless target-libatomic-bootstrap
configure-target-libitm: maybe-all-target-libatomic
@endunless target-libatomic-bootstrap
@unless target-libatomic-bootstrap
configure-target-libstdc++v3: maybe-all-target-libatomic
@endunless target-libatomic-bootstrap
@unless target-libatomic-bootstrap
configure-target-libssp: maybe-all-target-libatomic
@endunless target-libatomic-bootstrap
@unless target-libatomic-bootstrap
configure-target-libquadmath: maybe-all-target-libatomic
@endunless target-libatomic-bootstrap
@unless target-libatomic-bootstrap
configure-target-libgfortran: maybe-all-target-libatomic
@endunless target-libatomic-bootstrap
@unless target-libatomic-bootstrap
configure-target-libffi: maybe-all-target-libatomic
@endunless target-libatomic-bootstrap
@unless target-libatomic-bootstrap
configure-target-libobjc: maybe-all-target-libatomic
@endunless target-libatomic-bootstrap
@unless target-libatomic-bootstrap
configure-target-libada: maybe-all-target-libatomic
@endunless target-libatomic-bootstrap
@unless target-libatomic-bootstrap
configure-target-libgm2: maybe-all-target-libatomic
@endunless target-libatomic-bootstrap
@unless target-libatomic-bootstrap
configure-target-libgo: maybe-all-target-libatomic
@endunless target-libatomic-bootstrap
@unless target-libatomic-bootstrap
configure-target-libgrust: maybe-all-target-libatomic
@endunless target-libatomic-bootstrap
@unless target-zlib-bootstrap
configure-target-fastjar: maybe-configure-target-zlib
@endunless target-zlib-bootstrap
@ -68855,19 +68755,6 @@ all-fastjar: maybe-all-libiberty
all-bison: maybe-all-gettext
all-flex: maybe-all-gettext
all-m4: maybe-all-gettext
configure-target-libgloss: maybe-all-target-libatomic
configure-target-newlib: maybe-all-target-libatomic
configure-target-libitm: maybe-all-target-libatomic
configure-target-libstdc++v3: maybe-all-target-libatomic
configure-target-libssp: maybe-all-target-libatomic
configure-target-libquadmath: maybe-all-target-libatomic
configure-target-libgfortran: maybe-all-target-libatomic
configure-target-libffi: maybe-all-target-libatomic
configure-target-libobjc: maybe-all-target-libatomic
configure-target-libada: maybe-all-target-libatomic
configure-target-libgm2: maybe-all-target-libatomic
configure-target-libgo: maybe-all-target-libatomic
configure-target-libgrust: maybe-all-target-libatomic
configure-target-fastjar: maybe-configure-target-zlib
all-target-fastjar: maybe-all-target-zlib
configure-target-libgo: maybe-all-target-libstdc++-v3

View file

@ -245,7 +245,6 @@ HOST_EXPORTS = \
GMPINC="$(HOST_GMPINC)"; export GMPINC; \
ISLLIBS="$(HOST_ISLLIBS)"; export ISLLIBS; \
ISLINC="$(HOST_ISLINC)"; export ISLINC; \
TARGET_CONFIGDIRS="$(TARGET_CONFIGDIRS)"; export TARGET_CONFIGDIRS; \
XGCC_FLAGS_FOR_TARGET="$(XGCC_FLAGS_FOR_TARGET)"; export XGCC_FLAGS_FOR_TARGET; \
@if gcc-bootstrap
$(RPATH_ENVVAR)=`echo "$(TARGET_LIB_PATH)$$$(RPATH_ENVVAR)" | sed 's,::*,:,g;s,^:*,,;s,:*$$,,'`; export $(RPATH_ENVVAR); \

5
configure vendored
View file

@ -10924,11 +10924,6 @@ if echo " ${target_configdirs} " | grep " libgomp " > /dev/null 2>&1 ; then
bootstrap_target_libs=${bootstrap_target_libs}target-libgomp,
fi
# If we are building libatomic, bootstrap it.
if echo " ${target_configdirs} " | grep " libatomic " > /dev/null 2>&1 ; then
bootstrap_target_libs=${bootstrap_target_libs}target-libatomic,
fi
# If we are building libsanitizer and $BUILD_CONFIG contains bootstrap-asan
# or bootstrap-ubsan, bootstrap it.
if echo " ${target_configdirs} " | grep " libsanitizer " > /dev/null 2>&1; then

View file

@ -3151,11 +3151,6 @@ if echo " ${target_configdirs} " | grep " libgomp " > /dev/null 2>&1 ; then
bootstrap_target_libs=${bootstrap_target_libs}target-libgomp,
fi
# If we are building libatomic, bootstrap it.
if echo " ${target_configdirs} " | grep " libatomic " > /dev/null 2>&1 ; then
bootstrap_target_libs=${bootstrap_target_libs}target-libatomic,
fi
# If we are building libsanitizer and $BUILD_CONFIG contains bootstrap-asan
# or bootstrap-ubsan, bootstrap it.
if echo " ${target_configdirs} " | grep " libsanitizer " > /dev/null 2>&1; then

View file

@ -3353,9 +3353,6 @@ Use the Modern linker (MOLD) linker instead of the default linker.
fuse-linker-plugin
Common Undocumented Var(flag_use_linker_plugin)
flink-libatomic
Common Driver Var(flag_link_libatomic) Init(1)
; Positive if we should track variables, negative if we should run
; the var-tracking pass only to discard debug annotations, zero if
; we're not to run it.

View file

@ -2558,12 +2558,6 @@
#endif
/* Define if libatomic is built for the target */
#ifndef USED_FOR_TARGET
#undef TARGET_PROVIDES_LIBATOMIC
#endif
/* Define to 1 if you can safely include both <sys/time.h> and <time.h>. */
#ifndef USED_FOR_TARGET
#undef TIME_WITH_SYS_TIME

View file

@ -109,9 +109,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#define LINK_EH_SPEC "%{!static|static-pie:--eh-frame-hdr} "
#endif
#define GNU_USER_TARGET_LINK_GCC_C_SEQUENCE_SPEC \
"%{static|static-pie:--start-group} %G %{!nolibc:" LINK_LIBATOMIC_SPEC "%L} \
"%{static|static-pie:--start-group} %G %{!nolibc:%L} \
%{static|static-pie:--end-group}%{!static:%{!static-pie:%G}}"
#undef LINK_GCC_C_SEQUENCE_SPEC

6
gcc/configure vendored
View file

@ -33420,12 +33420,6 @@ $as_echo "#define ENABLE_DEFAULT_SSP 1" >>confdefs.h
fi
if echo " ${TARGET_CONFIGDIRS} " | grep " libatomic " > /dev/null 2>&1 ; then
$as_echo "#define TARGET_PROVIDES_LIBATOMIC 1" >>confdefs.h
fi
# Test for <sys/sdt.h> on the target.
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking sys/sdt.h in the target C library" >&5

View file

@ -7011,11 +7011,6 @@ if test x$enable_default_ssp = xyes ; then
fi
AC_SUBST([enable_default_ssp])
if echo " ${TARGET_CONFIGDIRS} " | grep " libatomic " > /dev/null 2>&1 ; then
AC_DEFINE(TARGET_PROVIDES_LIBATOMIC, 1,
[Define if libatomic is built for the target])
fi
# Test for <sys/sdt.h> on the target.
GCC_TARGET_TEMPLATE([HAVE_SYS_SDT_H])
AC_CACHE_CHECK([sys/sdt.h in the target C library], [gcc_cv_sys_sdt_h], [

View file

@ -206,7 +206,7 @@ in the following sections.
-fpermitted-flt-eval-methods=@var{standard}
-fplan9-extensions -fsigned-bitfields -funsigned-bitfields
-fsigned-char -funsigned-char -fstrict-flex-arrays[=@var{n}]
-flink-libatomic -fsso-struct=@var{endianness}}
-fsso-struct=@var{endianness}}
@item C++ Language Options
@xref{C++ Dialect Options,,Options Controlling C++ Dialect}.
@ -2899,10 +2899,6 @@ The @option{-fstrict_flex_arrays} option interacts with the
@option{-Wstrict-flex-arrays} option. @xref{Warning Options}, for more
information.
@opindex flink-libatomic
@item -flink-libatomic
Enable linking of libatomic if it's supported by target. Enabled by default.
@opindex fsso-struct
@item -fsso-struct=@var{endianness}
Set the default scalar storage order of structures and unions to the

View file

@ -980,13 +980,6 @@ proper position among the other output files. */
/* Here is the spec for running the linker, after compiling all files. */
#if defined(TARGET_PROVIDES_LIBATOMIC) && defined(USE_LD_AS_NEEDED)
#define LINK_LIBATOMIC_SPEC "%{!fno-link-libatomic:" LD_AS_NEEDED_OPTION \
" -latomic " LD_NO_AS_NEEDED_OPTION "} "
#else
#define LINK_LIBATOMIC_SPEC ""
#endif
/* This is overridable by the target in case they need to specify the
-lgcc and -lc order specially, yet not require them to override all
of LINK_COMMAND_SPEC. */

View file

@ -69,7 +69,7 @@ libatomic_darwin_rpath += -Wl,-rpath,@loader_path
endif
libatomic_la_LDFLAGS = $(libatomic_version_info) $(libatomic_version_script) \
-Wc,-fno-link-libatomic $(lt_host_flags) $(libatomic_darwin_rpath)
$(lt_host_flags) $(libatomic_darwin_rpath)
libatomic_la_SOURCES = gload.c gstore.c gcas.c gexch.c glfree.c lock.c init.c \
fenv.c fence.c flag.c
@ -162,11 +162,6 @@ libatomic_convenience_la_LIBADD = $(libatomic_la_LIBADD)
# when it is reloaded during the build of all-multi.
all-multi: $(libatomic_la_LIBADD)
gcc_objdir = $(MULTIBUILDTOP)../../$(host_subdir)/gcc
all: all-multi libatomic.la
$(INSTALL_DATA) .libs/libatomic.a $(gcc_objdir)/
chmod 644 $(gcc_objdir)/libatomic.a
# target overrides
-include $(tmake_file)

View file

@ -421,7 +421,7 @@ libatomic_version_info = -version-info $(libtool_VERSION)
@ENABLE_DARWIN_AT_RPATH_TRUE@ -Wc,-nodefaultrpaths \
@ENABLE_DARWIN_AT_RPATH_TRUE@ -Wl,-rpath,@loader_path
libatomic_la_LDFLAGS = $(libatomic_version_info) $(libatomic_version_script) \
-Wc,-fno-link-libatomic $(lt_host_flags) $(libatomic_darwin_rpath)
$(lt_host_flags) $(libatomic_darwin_rpath)
libatomic_la_SOURCES = gload.c gstore.c gcas.c gexch.c glfree.c lock.c \
init.c fenv.c fence.c flag.c $(am__append_5)
@ -458,7 +458,6 @@ libatomic_la_LIBADD = $(foreach s,$(SIZES),$(addsuffix \
@ARCH_X86_64_TRUE@@HAVE_IFUNC_TRUE@IFUNC_OPTIONS = -mcx16 -mcx16
libatomic_convenience_la_SOURCES = $(libatomic_la_SOURCES)
libatomic_convenience_la_LIBADD = $(libatomic_la_LIBADD)
gcc_objdir = $(MULTIBUILDTOP)../../$(host_subdir)/gcc
MULTISRCTOP =
MULTIBUILDTOP =
MULTIDIRS =
@ -902,9 +901,6 @@ vpath % $(strip $(search_path))
# makefile fragments to avoid broken *.Ppo getting included into the Makefile
# when it is reloaded during the build of all-multi.
all-multi: $(libatomic_la_LIBADD)
all: all-multi libatomic.la
$(INSTALL_DATA) .libs/libatomic.a $(gcc_objdir)/
chmod 644 $(gcc_objdir)/libatomic.a
# target overrides
-include $(tmake_file)

29
libatomic/configure vendored
View file

@ -3415,26 +3415,6 @@ esac
# the wrong, non-multilib-adjusted value will be used in multilibs.
# As a side effect, we have to subst CFLAGS ourselves.
# AC_PROG_CC sets CFLAGS to "-g -O2" by default (if unset), and
# then compile conftests with default CFLAGS, leaving no place to temporarily
# modify CFLAGS and restore them later. However we need to pass
# -fno-link-libatomic in CFLAGS so conftests compiled in AC_PROG_CC don't fail.
# Assert that CFLAGS is always set by user so the default setting of CFLAGS by
# AC_PROG_CC won't be applicable anyway.
if test -z "${CFLAGS}"; then
as_fn_error $? "CFLAGS must be set." "$LINENO" 5
fi
# In order to override CFLAGS_FOR_TARGET, all of our special flags go
# in XCFLAGS. But we need them in CFLAGS during configury. So put them
# in both places for now and restore CFLAGS at the end of config.
save_CFLAGS="$CFLAGS"
# Append -fno-link-libatomic to avoid automatically linking libatomic,
# while building libatomic itself.
XCFLAGS="$XCFLAGS -fno-link-libatomic"
CFLAGS="$save_CFLAGS $XCFLAGS"
ac_ext=c
@ -4613,6 +4593,11 @@ fi
# In order to override CFLAGS_FOR_TARGET, all of our special flags go
# in XCFLAGS. But we need them in CFLAGS during configury. So put them
# in both places for now and restore CFLAGS at the end of config.
save_CFLAGS="$CFLAGS"
# Find other programs we need.
if test -n "$ac_tool_prefix"; then
# Extract the first word of "${ac_tool_prefix}ar", so it can be a program name with args.
@ -11471,7 +11456,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
#line 11474 "configure"
#line 11459 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@ -11577,7 +11562,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
#line 11580 "configure"
#line 11565 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H

View file

@ -129,26 +129,6 @@ AC_SUBST(toolexeclibdir)
# the wrong, non-multilib-adjusted value will be used in multilibs.
# As a side effect, we have to subst CFLAGS ourselves.
# AC_PROG_CC sets CFLAGS to "-g -O2" by default (if unset), and
# then compile conftests with default CFLAGS, leaving no place to temporarily
# modify CFLAGS and restore them later. However we need to pass
# -fno-link-libatomic in CFLAGS so conftests compiled in AC_PROG_CC don't fail.
# Assert that CFLAGS is always set by user so the default setting of CFLAGS by
# AC_PROG_CC won't be applicable anyway.
if test -z "${CFLAGS}"; then
AC_MSG_ERROR([CFLAGS must be set.])
fi
# In order to override CFLAGS_FOR_TARGET, all of our special flags go
# in XCFLAGS. But we need them in CFLAGS during configury. So put them
# in both places for now and restore CFLAGS at the end of config.
save_CFLAGS="$CFLAGS"
# Append -fno-link-libatomic to avoid automatically linking libatomic,
# while building libatomic itself.
XCFLAGS="$XCFLAGS -fno-link-libatomic"
CFLAGS="$save_CFLAGS $XCFLAGS"
m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
m4_define([_AC_ARG_VAR_PRECIOUS],[])
AC_PROG_CC
@ -157,6 +137,11 @@ m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
AC_SUBST(CFLAGS)
# In order to override CFLAGS_FOR_TARGET, all of our special flags go
# in XCFLAGS. But we need them in CFLAGS during configury. So put them
# in both places for now and restore CFLAGS at the end of config.
save_CFLAGS="$CFLAGS"
# Find other programs we need.
AC_CHECK_TOOL(AR, ar)
AC_CHECK_TOOL(NM, nm)