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* [gcc r12-7027] make `-Werror` optional in libatomic/libbacktrace/libgomp/libitm/libsanitizer
@ 2022-02-03 15:10 Jakub Jelinek
0 siblings, 0 replies; only message in thread
From: Jakub Jelinek @ 2022-02-03 15:10 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:45ba6bf28b75ee3391df83fbfb1060a50dc63d3a
commit r12-7027-g45ba6bf28b75ee3391df83fbfb1060a50dc63d3a
Author: David Seifert <soap@gentoo.org>
Date: Thu Feb 3 15:47:10 2022 +0100
make `-Werror` optional in libatomic/libbacktrace/libgomp/libitm/libsanitizer
* `-Werror` can cause issues when a more recent version of GCC compiles
an older version:
- https://bugs.gentoo.org/229059
- https://bugs.gentoo.org/475350
- https://bugs.gentoo.org/667104
libatomic/ChangeLog:
* configure.ac: Support --disable-werror.
* configure: Regenerate.
libbacktrace/ChangeLog:
* configure.ac: Support --disable-werror.
* configure: Regenerate.
libgomp/ChangeLog:
* configure.ac: Support --disable-werror.
* configure: Regenerate.
libitm/ChangeLog:
* configure.ac: Support --disable-werror.
* configure: Regenerate.
libsanitizer/ChangeLog:
* configure.ac: Support --disable-werror.
* aclocal.m4: Include also ../config/warnings.m4.
* libbacktrace/Makefile.am (WARN_FLAGS): Remove.
* configure: Regenerate.
* Makefile.in: Regenerate.
* asan/Makefile.in: Regenerate.
* hwasan/Makefile.in: Regenerate.
* interception/Makefile.in: Regenerate.
* libbacktrace/Makefile.in: Regenerate.
* lsan/Makefile.in: Regenerate.
* sanitizer_common/Makefile.in: Regenerate.
* tsan/Makefile.in: Regenerate.
* ubsan/Makefile.in: Regenerate.
Co-Authored-By: Jakub Jelinek <jakub@redhat.com>
Diff:
---
libatomic/configure | 18 ++++++--
libatomic/configure.ac | 9 ++--
libbacktrace/configure | 14 ++++--
libbacktrace/configure.ac | 8 ++--
libgo/configure | 4 +-
libgo/configure.ac | 9 ++--
libgomp/configure | 18 ++++++--
libgomp/configure.ac | 9 ++--
libitm/configure | 18 ++++++--
libitm/configure.ac | 9 ++--
libsanitizer/Makefile.in | 2 +
libsanitizer/aclocal.m4 | 1 +
libsanitizer/asan/Makefile.in | 2 +
libsanitizer/configure | 76 ++++++++++++++++++++++++++++++-
libsanitizer/configure.ac | 10 ++++
libsanitizer/hwasan/Makefile.in | 2 +
libsanitizer/interception/Makefile.in | 2 +
libsanitizer/libbacktrace/Makefile.am | 2 -
libsanitizer/libbacktrace/Makefile.in | 5 +-
libsanitizer/lsan/Makefile.in | 2 +
libsanitizer/sanitizer_common/Makefile.in | 2 +
libsanitizer/tsan/Makefile.in | 2 +
libsanitizer/ubsan/Makefile.in | 2 +
23 files changed, 183 insertions(+), 43 deletions(-)
diff --git a/libatomic/configure b/libatomic/configure
index 34434d21764..92853dd8a45 100755
--- a/libatomic/configure
+++ b/libatomic/configure
@@ -805,6 +805,7 @@ with_gnu_ld
enable_libtool_lock
enable_maintainer_mode
enable_symvers
+enable_werror
enable_cet
with_gcc_major_version_only
'
@@ -1456,6 +1457,7 @@ Optional Features:
sometimes confusing) to the casual installer
--enable-symvers=STYLE enables symbol versioning of the shared library
[default=yes]
+ --disable-werror disable building with -Werror
--enable-cet enable Intel CET in target libraries [default=auto]
Optional Packages:
@@ -11380,7 +11382,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 11383 "configure"
+#line 11385 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -11486,7 +11488,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 11489 "configure"
+#line 11491 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -15565,9 +15567,17 @@ $as_echo "$as_me: not updating unwritable cache $cache_file" >&6;}
fi
rm -f confcache
+# Check whether --enable-werror was given.
+if test "${enable_werror+set}" = set; then :
+ enableval=$enable_werror;
+fi
+
# Add -Wall -Werror if we are using GCC.
-if test "x$GCC" = "xyes"; then
- XCFLAGS="$XCFLAGS -Wall -Werror"
+if test "x$GCC" = "xyes"; then :
+ XCFLAGS="$XCFLAGS -Wall"
+fi
+if test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"; then :
+ XCFLAGS="$XCFLAGS -Werror"
fi
# Add CET specific flags if CET is enabled
diff --git a/libatomic/configure.ac b/libatomic/configure.ac
index f350b9b3509..5563551aaae 100644
--- a/libatomic/configure.ac
+++ b/libatomic/configure.ac
@@ -251,10 +251,13 @@ LIBAT_ENABLE_SYMVERS
CFLAGS="$save_CFLAGS"
AC_CACHE_SAVE
+AC_ARG_ENABLE([werror],
+ [AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
# Add -Wall -Werror if we are using GCC.
-if test "x$GCC" = "xyes"; then
- XCFLAGS="$XCFLAGS -Wall -Werror"
-fi
+AS_IF([test "x$GCC" = "xyes"],
+ [XCFLAGS="$XCFLAGS -Wall"])
+AS_IF([test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"],
+ [XCFLAGS="$XCFLAGS -Werror"])
# Add CET specific flags if CET is enabled
GCC_CET_FLAGS(CET_FLAGS)
diff --git a/libbacktrace/configure b/libbacktrace/configure
index a2f33c0f35d..17f470a4bec 100755
--- a/libbacktrace/configure
+++ b/libbacktrace/configure
@@ -801,6 +801,7 @@ with_gnu_ld
enable_libtool_lock
enable_largefile
enable_cet
+enable_werror
with_system_libunwind
enable_host_shared
'
@@ -1448,6 +1449,7 @@ Optional Features:
--disable-libtool-lock avoid locking (might break parallel builds)
--disable-largefile omit support for large files
--enable-cet enable Intel CET in target libraries [default=auto]
+ --disable-werror disable building with -Werror
--enable-host-shared build host code as shared libraries
--enable-cet enable Intel CET in host libraries [default=auto]
@@ -11509,7 +11511,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 11512 "configure"
+#line 11514 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -11615,7 +11617,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 11618 "configure"
+#line 11620 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -12300,10 +12302,14 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
-if test -n "${with_target_subdir}"; then
- WARN_FLAGS="$WARN_FLAGS -Werror"
+# Check whether --enable-werror was given.
+if test "${enable_werror+set}" = set; then :
+ enableval=$enable_werror;
fi
+if test "x$enable_werror" != "xno" && test -n "${with_target_subdir}"; then :
+ WARN_FLAGS="$WARN_FLAGS -Werror"
+fi
if test -n "${with_target_subdir}"; then
diff --git a/libbacktrace/configure.ac b/libbacktrace/configure.ac
index 0dfd82bc03e..597c9705db8 100644
--- a/libbacktrace/configure.ac
+++ b/libbacktrace/configure.ac
@@ -145,10 +145,10 @@ ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wwrite-strings -Wstrict-prototypes \
-Wmissing-format-attribute -Wcast-qual],
[WARN_FLAGS])
-if test -n "${with_target_subdir}"; then
- WARN_FLAGS="$WARN_FLAGS -Werror"
-fi
-
+AC_ARG_ENABLE([werror],
+ [AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
+AS_IF([test "x$enable_werror" != "xno" && test -n "${with_target_subdir}"],
+ [WARN_FLAGS="$WARN_FLAGS -Werror"])
AC_SUBST(WARN_FLAGS)
if test -n "${with_target_subdir}"; then
diff --git a/libgo/configure b/libgo/configure
index 57ceeb2baa7..309e17dd91f 100755
--- a/libgo/configure
+++ b/libgo/configure
@@ -1496,7 +1496,7 @@ Optional Features:
--enable-fast-install[=PKGS]
optimize for fast installation [default=yes]
--disable-libtool-lock avoid locking (might break parallel builds)
- --enable-werror turns on -Werror [default=yes]
+ --disable-werror disable building with -Werror
--enable-version-specific-runtime-libs
Specify that runtime libraries should be installed
in a compiler-specific directory
@@ -13834,7 +13834,7 @@ if test "${enable_werror+set}" = set; then :
enableval=$enable_werror;
fi
-if test "x$enable_werror" != "xno"; then
+if test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"; then :
WERROR="-Werror"
fi
diff --git a/libgo/configure.ac b/libgo/configure.ac
index 1f4f32dae2b..8691d5b0ac1 100644
--- a/libgo/configure.ac
+++ b/libgo/configure.ac
@@ -62,11 +62,10 @@ AC_PROG_AWK
WARN_FLAGS='-Wall -Wextra -Wwrite-strings -Wcast-qual'
AC_SUBST(WARN_FLAGS)
-AC_ARG_ENABLE(werror, [AS_HELP_STRING([--enable-werror],
- [turns on -Werror @<:@default=yes@:>@])])
-if test "x$enable_werror" != "xno"; then
- WERROR="-Werror"
-fi
+AC_ARG_ENABLE([werror],
+ [AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
+AS_IF([test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"],
+ [WERROR="-Werror"])
AC_SUBST(WERROR)
glibgo_toolexecdir=no
diff --git a/libgomp/configure b/libgomp/configure
index 37390ce5d66..a73a6d44003 100755
--- a/libgomp/configure
+++ b/libgomp/configure
@@ -825,6 +825,7 @@ enable_silent_rules
enable_multilib
with_toolexeclibdir
enable_dependency_tracking
+enable_werror
enable_shared
enable_static
with_pic
@@ -1486,6 +1487,7 @@ Optional Features:
do not reject slow dependency extractors
--disable-dependency-tracking
speeds up one-time build
+ --disable-werror disable building with -Werror
--enable-shared[=PKGS] build shared libraries [default=yes]
--enable-static[=PKGS] build static libraries [default=yes]
--enable-fast-install[=PKGS]
@@ -4611,9 +4613,17 @@ fi
# in both places for now and restore CFLAGS at the end of config.
save_CFLAGS="$CFLAGS"
+# Check whether --enable-werror was given.
+if test "${enable_werror+set}" = set; then :
+ enableval=$enable_werror;
+fi
+
# Add -Wall -Werror if we are using GCC.
-if test "x$GCC" = "xyes"; then
- XCFLAGS="$XCFLAGS -Wall -Werror"
+if test "x$GCC" = "xyes"; then :
+ XCFLAGS="$XCFLAGS -Wall"
+fi
+if test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"; then :
+ XCFLAGS="$XCFLAGS -Werror"
fi
# Find other programs we need.
@@ -11421,7 +11431,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 11424 "configure"
+#line 11434 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -11527,7 +11537,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 11530 "configure"
+#line 11540 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
diff --git a/libgomp/configure.ac b/libgomp/configure.ac
index bfb613b91f0..a9b1f3973f7 100644
--- a/libgomp/configure.ac
+++ b/libgomp/configure.ac
@@ -121,10 +121,13 @@ AC_SUBST(CFLAGS)
# in both places for now and restore CFLAGS at the end of config.
save_CFLAGS="$CFLAGS"
+AC_ARG_ENABLE([werror],
+ [AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
# Add -Wall -Werror if we are using GCC.
-if test "x$GCC" = "xyes"; then
- XCFLAGS="$XCFLAGS -Wall -Werror"
-fi
+AS_IF([test "x$GCC" = "xyes"],
+ [XCFLAGS="$XCFLAGS -Wall"])
+AS_IF([test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"],
+ [XCFLAGS="$XCFLAGS -Werror"])
# Find other programs we need.
AC_CHECK_TOOL(AR, ar)
diff --git a/libitm/configure b/libitm/configure
index 966bf40537d..18fc2d3a10a 100755
--- a/libitm/configure
+++ b/libitm/configure
@@ -814,6 +814,7 @@ enable_maintainer_mode
enable_linux_futex
enable_tls
enable_symvers
+enable_werror
enable_cet
with_gcc_major_version_only
'
@@ -1468,6 +1469,7 @@ Optional Features:
--enable-tls Use thread-local storage [default=yes]
--enable-symvers=STYLE enables symbol versioning of the shared library
[default=yes]
+ --disable-werror disable building with -Werror
--enable-cet enable Intel CET in target libraries [default=auto]
Optional Packages:
@@ -12056,7 +12058,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 12059 "configure"
+#line 12061 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -12162,7 +12164,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 12165 "configure"
+#line 12167 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -17847,9 +17849,17 @@ $as_echo "$as_me: not updating unwritable cache $cache_file" >&6;}
fi
rm -f confcache
+# Check whether --enable-werror was given.
+if test "${enable_werror+set}" = set; then :
+ enableval=$enable_werror;
+fi
+
# Add -Wall -Werror if we are using GCC.
-if test "x$GCC" = "xyes"; then
- XCFLAGS="$XCFLAGS -Wall -Werror"
+if test "x$GCC" = "xyes"; then :
+ XCFLAGS="$XCFLAGS -Wall"
+fi
+if test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"; then :
+ XCFLAGS="$XCFLAGS -Werror"
fi
XCFLAGS="$XCFLAGS $XPCFLAGS"
diff --git a/libitm/configure.ac b/libitm/configure.ac
index ac81b146845..78a682376d9 100644
--- a/libitm/configure.ac
+++ b/libitm/configure.ac
@@ -261,10 +261,13 @@ GCC_CHECK_ELF_STYLE_WEAKREF
CFLAGS="$save_CFLAGS"
AC_CACHE_SAVE
+AC_ARG_ENABLE([werror],
+ [AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
# Add -Wall -Werror if we are using GCC.
-if test "x$GCC" = "xyes"; then
- XCFLAGS="$XCFLAGS -Wall -Werror"
-fi
+AS_IF([test "x$GCC" = "xyes"],
+ [XCFLAGS="$XCFLAGS -Wall"])
+AS_IF([test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"],
+ [XCFLAGS="$XCFLAGS -Werror"])
XCFLAGS="$XCFLAGS $XPCFLAGS"
diff --git a/libsanitizer/Makefile.in b/libsanitizer/Makefile.in
index 486c7920ee2..aab88deb6e8 100644
--- a/libsanitizer/Makefile.in
+++ b/libsanitizer/Makefile.in
@@ -108,6 +108,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
$(top_srcdir)/../config/override.m4 \
$(top_srcdir)/../config/stdint.m4 \
$(top_srcdir)/../config/toolexeclibdir.m4 \
+ $(top_srcdir)/../config/warnings.m4 \
$(top_srcdir)/../ltoptions.m4 $(top_srcdir)/../ltsugar.m4 \
$(top_srcdir)/../ltversion.m4 $(top_srcdir)/../lt~obsolete.m4 \
$(top_srcdir)/acinclude.m4 $(top_srcdir)/../libtool.m4 \
@@ -290,6 +291,7 @@ STRIP = @STRIP@
TSAN_TARGET_DEPENDENT_OBJECTS = @TSAN_TARGET_DEPENDENT_OBJECTS@
VERSION = @VERSION@
VIEW_FILE = @VIEW_FILE@
+WARN_FLAGS = @WARN_FLAGS@
abs_builddir = @abs_builddir@
abs_srcdir = @abs_srcdir@
abs_top_builddir = @abs_top_builddir@
diff --git a/libsanitizer/aclocal.m4 b/libsanitizer/aclocal.m4
index 85f72c2eb47..6aa15694eba 100644
--- a/libsanitizer/aclocal.m4
+++ b/libsanitizer/aclocal.m4
@@ -1195,6 +1195,7 @@ m4_include([../config/multi.m4])
m4_include([../config/override.m4])
m4_include([../config/stdint.m4])
m4_include([../config/toolexeclibdir.m4])
+m4_include([../config/warnings.m4])
m4_include([../ltoptions.m4])
m4_include([../ltsugar.m4])
m4_include([../ltversion.m4])
diff --git a/libsanitizer/asan/Makefile.in b/libsanitizer/asan/Makefile.in
index e00927dd13d..2476fbc5a26 100644
--- a/libsanitizer/asan/Makefile.in
+++ b/libsanitizer/asan/Makefile.in
@@ -103,6 +103,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
$(top_srcdir)/../config/override.m4 \
$(top_srcdir)/../config/stdint.m4 \
$(top_srcdir)/../config/toolexeclibdir.m4 \
+ $(top_srcdir)/../config/warnings.m4 \
$(top_srcdir)/../ltoptions.m4 $(top_srcdir)/../ltsugar.m4 \
$(top_srcdir)/../ltversion.m4 $(top_srcdir)/../lt~obsolete.m4 \
$(top_srcdir)/acinclude.m4 $(top_srcdir)/../libtool.m4 \
@@ -344,6 +345,7 @@ STRIP = @STRIP@
TSAN_TARGET_DEPENDENT_OBJECTS = @TSAN_TARGET_DEPENDENT_OBJECTS@
VERSION = @VERSION@
VIEW_FILE = @VIEW_FILE@
+WARN_FLAGS = @WARN_FLAGS@
abs_builddir = @abs_builddir@
abs_srcdir = @abs_srcdir@
abs_top_builddir = @abs_top_builddir@
diff --git a/libsanitizer/configure b/libsanitizer/configure
index 08bdbc68841..771b135573a 100755
--- a/libsanitizer/configure
+++ b/libsanitizer/configure
@@ -639,6 +639,7 @@ EXTRA_CXXFLAGS
EXTRA_CFLAGS
EXTRA_ASFLAGS
get_gcc_base_ver
+WARN_FLAGS
SANITIZER_COMMON_TARGET_DEPENDENT_OBJECTS
TSAN_TARGET_DEPENDENT_OBJECTS
LIBBACKTRACE_SUPPORTED_FALSE
@@ -816,6 +817,7 @@ with_pic
enable_fast_install
with_gnu_ld
enable_libtool_lock
+enable_werror
with_gcc_major_version_only
enable_cet
'
@@ -1469,6 +1471,7 @@ Optional Features:
--enable-fast-install[=PKGS]
optimize for fast installation [default=yes]
--disable-libtool-lock avoid locking (might break parallel builds)
+ --disable-werror disable building with -Werror
--enable-cet enable Intel CET in target libraries [default=auto]
Optional Packages:
@@ -12356,7 +12359,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 12359 "configure"
+#line 12362 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -12462,7 +12465,7 @@ else
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
lt_status=$lt_dlunknown
cat > conftest.$ac_ext <<_LT_EOF
-#line 12465 "configure"
+#line 12468 "configure"
#include "confdefs.h"
#if HAVE_DLFCN_H
@@ -16827,6 +16830,75 @@ fi
+# Check whether --enable-werror was given.
+if test "${enable_werror+set}" = set; then :
+ enableval=$enable_werror;
+fi
+
+
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+WARN_FLAGS=
+save_CFLAGS="$CFLAGS"
+for real_option in -Wextra -Wall -Wwrite-strings \
+ -Wmissing-format-attribute -Wcast-qual; do
+ # Do the check with the no- prefix removed since gcc silently
+ # accepts any -Wno-* option on purpose
+ case $real_option in
+ -Wno-*) option=-W`expr x$real_option : 'x-Wno-\(.*\)'` ;;
+ *) option=$real_option ;;
+ esac
+ as_acx_Woption=`$as_echo "acx_cv_prog_cc_warning_$option" | $as_tr_sh`
+
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports $option" >&5
+$as_echo_n "checking whether $CC supports $option... " >&6; }
+if eval \${$as_acx_Woption+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ CFLAGS="$option"
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+int
+main ()
+{
+
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+ eval "$as_acx_Woption=yes"
+else
+ eval "$as_acx_Woption=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+fi
+eval ac_res=\$$as_acx_Woption
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+ if test `eval 'as_val=${'$as_acx_Woption'};$as_echo "$as_val"'` = yes; then :
+ WARN_FLAGS="$WARN_FLAGS${WARN_FLAGS:+ }$real_option"
+fi
+ done
+CFLAGS="$save_CFLAGS"
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+if test "x$enable_werror" != "xno"; then :
+ WARN_FLAGS="$WARN_FLAGS -Werror"
+fi
+
+
# Determine what GCC version number to use in filesystem paths.
get_gcc_base_ver="cat"
diff --git a/libsanitizer/configure.ac b/libsanitizer/configure.ac
index 13cd302030d..7f1ef3979c4 100644
--- a/libsanitizer/configure.ac
+++ b/libsanitizer/configure.ac
@@ -400,6 +400,16 @@ fi
AC_SUBST([TSAN_TARGET_DEPENDENT_OBJECTS])
AC_SUBST([SANITIZER_COMMON_TARGET_DEPENDENT_OBJECTS])
+AC_ARG_ENABLE([werror],
+ [AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
+
+ACX_PROG_CC_WARNING_OPTS([-Wextra -Wall -Wwrite-strings \
+ -Wmissing-format-attribute -Wcast-qual],
+ [WARN_FLAGS])
+AS_IF([test "x$enable_werror" != "xno"],
+ [WARN_FLAGS="$WARN_FLAGS -Werror"])
+AC_SUBST([WARN_FLAGS])
+
# Determine what GCC version number to use in filesystem paths.
GCC_BASE_VER
diff --git a/libsanitizer/hwasan/Makefile.in b/libsanitizer/hwasan/Makefile.in
index 0021e783c61..67553f3979d 100644
--- a/libsanitizer/hwasan/Makefile.in
+++ b/libsanitizer/hwasan/Makefile.in
@@ -101,6 +101,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
$(top_srcdir)/../config/override.m4 \
$(top_srcdir)/../config/stdint.m4 \
$(top_srcdir)/../config/toolexeclibdir.m4 \
+ $(top_srcdir)/../config/warnings.m4 \
$(top_srcdir)/../ltoptions.m4 $(top_srcdir)/../ltsugar.m4 \
$(top_srcdir)/../ltversion.m4 $(top_srcdir)/../lt~obsolete.m4 \
$(top_srcdir)/acinclude.m4 $(top_srcdir)/../libtool.m4 \
@@ -332,6 +333,7 @@ STRIP = @STRIP@
TSAN_TARGET_DEPENDENT_OBJECTS = @TSAN_TARGET_DEPENDENT_OBJECTS@
VERSION = @VERSION@
VIEW_FILE = @VIEW_FILE@
+WARN_FLAGS = @WARN_FLAGS@
abs_builddir = @abs_builddir@
abs_srcdir = @abs_srcdir@
abs_top_builddir = @abs_top_builddir@
diff --git a/libsanitizer/interception/Makefile.in b/libsanitizer/interception/Makefile.in
index c14d5270286..bce788aeea7 100644
--- a/libsanitizer/interception/Makefile.in
+++ b/libsanitizer/interception/Makefile.in
@@ -99,6 +99,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
$(top_srcdir)/../config/override.m4 \
$(top_srcdir)/../config/stdint.m4 \
$(top_srcdir)/../config/toolexeclibdir.m4 \
+ $(top_srcdir)/../config/warnings.m4 \
$(top_srcdir)/../ltoptions.m4 $(top_srcdir)/../ltsugar.m4 \
$(top_srcdir)/../ltversion.m4 $(top_srcdir)/../lt~obsolete.m4 \
$(top_srcdir)/acinclude.m4 $(top_srcdir)/../libtool.m4 \
@@ -262,6 +263,7 @@ STRIP = @STRIP@
TSAN_TARGET_DEPENDENT_OBJECTS = @TSAN_TARGET_DEPENDENT_OBJECTS@
VERSION = @VERSION@
VIEW_FILE = @VIEW_FILE@
+WARN_FLAGS = @WARN_FLAGS@
abs_builddir = @abs_builddir@
abs_srcdir = @abs_srcdir@
abs_top_builddir = @abs_top_builddir@
diff --git a/libsanitizer/libbacktrace/Makefile.am b/libsanitizer/libbacktrace/Makefile.am
index 16accd468df..0cf8d2104c0 100644
--- a/libsanitizer/libbacktrace/Makefile.am
+++ b/libsanitizer/libbacktrace/Makefile.am
@@ -34,8 +34,6 @@ ACLOCAL_AMFLAGS = -I ../.. -I ../../config
AM_CPPFLAGS = -I $(top_srcdir)/../include -I $(top_srcdir)/../libgcc \
-I ../../libgcc -I .. -I $(top_srcdir) -I $(top_srcdir)/../libbacktrace
-WARN_FLAGS = -W -Wall -Wwrite-strings -Wmissing-format-attribute \
- -Wcast-qual -Werror
C_WARN_FLAGS = $(WARN_FLAGS) -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition
CXX_WARN_FLAGS = $(WARN_FLAGS) -Wno-unused-parameter
AM_CFLAGS = $(C_WARN_FLAGS)
diff --git a/libsanitizer/libbacktrace/Makefile.in b/libsanitizer/libbacktrace/Makefile.in
index f008f8eb552..ece4f11a855 100644
--- a/libsanitizer/libbacktrace/Makefile.in
+++ b/libsanitizer/libbacktrace/Makefile.in
@@ -130,6 +130,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
$(top_srcdir)/../config/override.m4 \
$(top_srcdir)/../config/stdint.m4 \
$(top_srcdir)/../config/toolexeclibdir.m4 \
+ $(top_srcdir)/../config/warnings.m4 \
$(top_srcdir)/../ltoptions.m4 $(top_srcdir)/../ltsugar.m4 \
$(top_srcdir)/../ltversion.m4 $(top_srcdir)/../lt~obsolete.m4 \
$(top_srcdir)/acinclude.m4 $(top_srcdir)/../libtool.m4 \
@@ -312,6 +313,7 @@ STRIP = @STRIP@
TSAN_TARGET_DEPENDENT_OBJECTS = @TSAN_TARGET_DEPENDENT_OBJECTS@
VERSION = @VERSION@
VIEW_FILE = @VIEW_FILE@
+WARN_FLAGS = @WARN_FLAGS@
abs_builddir = @abs_builddir@
abs_srcdir = @abs_srcdir@
abs_top_builddir = @abs_top_builddir@
@@ -385,9 +387,6 @@ ACLOCAL_AMFLAGS = -I ../.. -I ../../config
AM_CPPFLAGS = -I $(top_srcdir)/../include -I $(top_srcdir)/../libgcc \
-I ../../libgcc -I .. -I $(top_srcdir) -I $(top_srcdir)/../libbacktrace
-WARN_FLAGS = -W -Wall -Wwrite-strings -Wmissing-format-attribute \
- -Wcast-qual -Werror
-
C_WARN_FLAGS = $(WARN_FLAGS) -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition
CXX_WARN_FLAGS = $(WARN_FLAGS) -Wno-unused-parameter
AM_CFLAGS = $(C_WARN_FLAGS) $(EXTRA_CFLAGS)
diff --git a/libsanitizer/lsan/Makefile.in b/libsanitizer/lsan/Makefile.in
index 25ac00cf8db..857f244cd86 100644
--- a/libsanitizer/lsan/Makefile.in
+++ b/libsanitizer/lsan/Makefile.in
@@ -101,6 +101,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
$(top_srcdir)/../config/override.m4 \
$(top_srcdir)/../config/stdint.m4 \
$(top_srcdir)/../config/toolexeclibdir.m4 \
+ $(top_srcdir)/../config/warnings.m4 \
$(top_srcdir)/../ltoptions.m4 $(top_srcdir)/../ltsugar.m4 \
$(top_srcdir)/../ltversion.m4 $(top_srcdir)/../lt~obsolete.m4 \
$(top_srcdir)/acinclude.m4 $(top_srcdir)/../libtool.m4 \
@@ -307,6 +308,7 @@ STRIP = @STRIP@
TSAN_TARGET_DEPENDENT_OBJECTS = @TSAN_TARGET_DEPENDENT_OBJECTS@
VERSION = @VERSION@
VIEW_FILE = @VIEW_FILE@
+WARN_FLAGS = @WARN_FLAGS@
abs_builddir = @abs_builddir@
abs_srcdir = @abs_srcdir@
abs_top_builddir = @abs_top_builddir@
diff --git a/libsanitizer/sanitizer_common/Makefile.in b/libsanitizer/sanitizer_common/Makefile.in
index 2f68f22c80a..c4b009fed83 100644
--- a/libsanitizer/sanitizer_common/Makefile.in
+++ b/libsanitizer/sanitizer_common/Makefile.in
@@ -105,6 +105,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
$(top_srcdir)/../config/override.m4 \
$(top_srcdir)/../config/stdint.m4 \
$(top_srcdir)/../config/toolexeclibdir.m4 \
+ $(top_srcdir)/../config/warnings.m4 \
$(top_srcdir)/../ltoptions.m4 $(top_srcdir)/../ltsugar.m4 \
$(top_srcdir)/../ltversion.m4 $(top_srcdir)/../lt~obsolete.m4 \
$(top_srcdir)/acinclude.m4 $(top_srcdir)/../libtool.m4 \
@@ -299,6 +300,7 @@ STRIP = @STRIP@
TSAN_TARGET_DEPENDENT_OBJECTS = @TSAN_TARGET_DEPENDENT_OBJECTS@
VERSION = @VERSION@
VIEW_FILE = @VIEW_FILE@
+WARN_FLAGS = @WARN_FLAGS@
abs_builddir = @abs_builddir@
abs_srcdir = @abs_srcdir@
abs_top_builddir = @abs_top_builddir@
diff --git a/libsanitizer/tsan/Makefile.in b/libsanitizer/tsan/Makefile.in
index a76b8d43172..538d2e8eb68 100644
--- a/libsanitizer/tsan/Makefile.in
+++ b/libsanitizer/tsan/Makefile.in
@@ -102,6 +102,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
$(top_srcdir)/../config/override.m4 \
$(top_srcdir)/../config/stdint.m4 \
$(top_srcdir)/../config/toolexeclibdir.m4 \
+ $(top_srcdir)/../config/warnings.m4 \
$(top_srcdir)/../ltoptions.m4 $(top_srcdir)/../ltsugar.m4 \
$(top_srcdir)/../ltversion.m4 $(top_srcdir)/../lt~obsolete.m4 \
$(top_srcdir)/acinclude.m4 $(top_srcdir)/../libtool.m4 \
@@ -336,6 +337,7 @@ STRIP = @STRIP@
TSAN_TARGET_DEPENDENT_OBJECTS = @TSAN_TARGET_DEPENDENT_OBJECTS@
VERSION = @VERSION@
VIEW_FILE = @VIEW_FILE@
+WARN_FLAGS = @WARN_FLAGS@
abs_builddir = @abs_builddir@
abs_srcdir = @abs_srcdir@
abs_top_builddir = @abs_top_builddir@
diff --git a/libsanitizer/ubsan/Makefile.in b/libsanitizer/ubsan/Makefile.in
index ad75c67e266..497e0338696 100644
--- a/libsanitizer/ubsan/Makefile.in
+++ b/libsanitizer/ubsan/Makefile.in
@@ -101,6 +101,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
$(top_srcdir)/../config/override.m4 \
$(top_srcdir)/../config/stdint.m4 \
$(top_srcdir)/../config/toolexeclibdir.m4 \
+ $(top_srcdir)/../config/warnings.m4 \
$(top_srcdir)/../ltoptions.m4 $(top_srcdir)/../ltsugar.m4 \
$(top_srcdir)/../ltversion.m4 $(top_srcdir)/../lt~obsolete.m4 \
$(top_srcdir)/acinclude.m4 $(top_srcdir)/../libtool.m4 \
@@ -301,6 +302,7 @@ STRIP = @STRIP@
TSAN_TARGET_DEPENDENT_OBJECTS = @TSAN_TARGET_DEPENDENT_OBJECTS@
VERSION = @VERSION@
VIEW_FILE = @VIEW_FILE@
+WARN_FLAGS = @WARN_FLAGS@
abs_builddir = @abs_builddir@
abs_srcdir = @abs_srcdir@
abs_top_builddir = @abs_top_builddir@
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