This patch drops gdb's configury support for glibc's mcheck function.
It has been observed to cause false abort()s, because it is
thread-unsafe yet interposes every malloc/free operation. So if any
library transitively used by gdb also uses threads, then these
functions can easily corrupt their own checking data. These days, gcc
ASAN and valgrind provide high quality checking, and mcheck is
apparently itself being slowly deprecated.
So, let's stop linking to it. Attached patch drops the
autoconf/Makefile machinery for both gdb and gdbserver. No
testsuite-visible impact. IMHO not worth mentioning in NEWS.
See also: https://sourceware.org/bugzilla/show_bug.cgi?id=9939
gdb/ChangeLog
PR build/24886
* configure.ac: Drop enable-libmcheck support.
* configure, config.in: Rebuild.
* libmcheck.m4: Remove.
* acinclude.m4: Don't include it.
* Makefile.in: Don't distribute it.
* top.c (print_gdb_configuration): Don't mention it.
gdb/gdbserver/ChangeLog
PR build/24886
* configure.ac: Drop enable-libmcheck support.
* configure, config.in: Rebuild.
* acinclude.m4: Don't include it.
+2019-08-06 Frank Ch. Eigler <fche@redhat.com>
+
+ PR build/24886
+ * configure.ac: Drop enable-libmcheck support.
+ * configure, config.in: Rebuild.
+ * libmcheck.m4: Remove.
+ * acinclude.m4: Don't include it.
+ * Makefile.in: Don't distribute it.
+ * top.c (print_gdb_configuration): Don't mention it.
+
2019-08-06 Tom Tromey <tom@tromey.com>
* utils.c (set_output_style): Sometimes pass stream to
aclocal_m4_deps = \
configure.ac \
acx_configure_dir.m4 \
- libmcheck.m4 \
transform.m4 \
../bfd/bfd.m4 \
../config/acinclude.m4 \
sinclude(acx_configure_dir.m4)
-# This gets GDB_AC_LIBMCHECK.
-sinclude(libmcheck.m4)
-
# This gets GDB_AC_TRANSFORM.
sinclude(transform.m4)
/* Define to 1 if you have the `m' library (-lm). */
#undef HAVE_LIBM
-/* Define to 1 if you have the `mcheck' library (-lmcheck). */
-#undef HAVE_LIBMCHECK
-
/* Define if you have the mpfr library. */
#undef HAVE_LIBMPFR
with_python
with_guile
enable_source_highlight
-enable_libmcheck
with_intel_pt
with_libipt_prefix
with_included_regex
--disable-rpath do not hardcode runtime library paths
--enable-source-highlight
enable source-highlight for source listings
- --enable-libmcheck Try linking with -lmcheck if available
--enable-werror treat compile warnings as errors
--enable-build-warnings enable build-time compiler warnings if gcc is used
--enable-gdb-build-warnings
-# --------------------- #
-# Check for libmcheck. #
-# --------------------- #
-
-# Enable -lmcheck by default (it provides cheap-enough memory mangling),
-# but turn it off if Python is enabled with threads, since -lmcheck is
-# not thread safe (http://sourceware.org/bugzilla/show_bug.cgi?id=9939),
-# and for releases.
-if test \( "${have_libpython}" = "no" -o "${python_has_threads}" = "no" \) \
- && $development; then
- libmcheck_default=yes
-else
- libmcheck_default=no
-fi
-
- # Check whether --enable-libmcheck was given.
-if test "${enable_libmcheck+set}" = set; then :
- enableval=$enable_libmcheck; case "${enableval}" in
- yes | y) ENABLE_LIBMCHECK="yes" ;;
- no | n) ENABLE_LIBMCHECK="no" ;;
- *) as_fn_error $? "bad value ${enableval} for --enable-libmcheck" "$LINENO" 5 ;;
- esac
-fi
-
-
- if test -z "${ENABLE_LIBMCHECK}"; then
- ENABLE_LIBMCHECK=${libmcheck_default}
- fi
-
- if test "$ENABLE_LIBMCHECK" = "yes" ; then
- { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lmcheck" >&5
-$as_echo_n "checking for main in -lmcheck... " >&6; }
-if ${ac_cv_lib_mcheck_main+:} false; then :
- $as_echo_n "(cached) " >&6
-else
- ac_check_lib_save_LIBS=$LIBS
-LIBS="-lmcheck $LIBS"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h. */
-
-
-int
-main ()
-{
-return main ();
- ;
- return 0;
-}
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
- ac_cv_lib_mcheck_main=yes
-else
- ac_cv_lib_mcheck_main=no
-fi
-rm -f core conftest.err conftest.$ac_objext \
- conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_mcheck_main" >&5
-$as_echo "$ac_cv_lib_mcheck_main" >&6; }
-if test "x$ac_cv_lib_mcheck_main" = xyes; then :
- cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBMCHECK 1
-_ACEOF
-
- LIBS="-lmcheck $LIBS"
-
-fi
-
- fi
-
-
-if test "$ENABLE_LIBMCHECK" = "yes" \
- -a "${have_libpython}" != "no" \
- -a "${python_has_threads}" = "yes" ; then
- { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: --enable-libmcheck may lead to spurious crashes if threads are used in python" >&5
-$as_echo "$as_me: WARNING: --enable-libmcheck may lead to spurious crashes if threads are used in python" >&2;}
-fi
-
# Check whether --with-intel_pt was given.
if test "${with_intel_pt+set}" = set; then :
AC_SUBST(SRCHIGH_LIBS)
AC_SUBST(SRCHIGH_CFLAGS)
-# --------------------- #
-# Check for libmcheck. #
-# --------------------- #
-
-# Enable -lmcheck by default (it provides cheap-enough memory mangling),
-# but turn it off if Python is enabled with threads, since -lmcheck is
-# not thread safe (http://sourceware.org/bugzilla/show_bug.cgi?id=9939),
-# and for releases.
-if test \( "${have_libpython}" = "no" -o "${python_has_threads}" = "no" \) \
- && $development; then
- libmcheck_default=yes
-else
- libmcheck_default=no
-fi
-GDB_AC_LIBMCHECK(${libmcheck_default})
-
-if test "$ENABLE_LIBMCHECK" = "yes" \
- -a "${have_libpython}" != "no" \
- -a "${python_has_threads}" = "yes" ; then
- AC_MSG_WARN(--enable-libmcheck may lead to spurious crashes if threads are used in python)
-fi
-
AC_ARG_WITH(intel_pt,
AS_HELP_STRING([--with-intel-pt], [include Intel Processor Trace support (auto/yes/no)]),
[], [with_intel_pt=auto])
+2019-08-06 Frank Ch. Eigler <fche@redhat.com>
+
+ PR build/24886
+ * configure.ac: Drop enable-libmcheck support.
+ * configure, config.in: Rebuild.
+ * acinclude.m4: Don't include it.
+
2019-07-19 Alan Hayward <alan.hayward@arm.com>
* configure.srv: Remove Arm xml files.
sinclude(../acx_configure_dir.m4)
-# This gets GDB_AC_LIBMCHECK.
-sinclude(../libmcheck.m4)
-
# This gets AM_GDB_WARNINGS.
sinclude(../warning.m4)
/* Define to 1 if you have the `dl' library (-ldl). */
#undef HAVE_LIBDL
-/* Define to 1 if you have the `mcheck' library (-lmcheck). */
-#undef HAVE_LIBMCHECK
-
/* Define if the target supports branch tracing. */
#undef HAVE_LINUX_BTRACE
enable_option_checking
enable_maintainer_mode
enable_largefile
-enable_libmcheck
enable_unit_tests
with_ust
with_ust_include
enable make rules and dependencies not useful (and
sometimes confusing) to the casual installer
--disable-largefile omit support for large files
- --enable-libmcheck Try linking with -lmcheck if available
--enable-unit-tests Enable the inclusion of unit tests when compiling
GDB
--enable-werror treat compile warnings as errors
} # ac_fn_c_check_header_compile
-# ac_fn_c_try_link LINENO
-# -----------------------
-# Try to link conftest.$ac_ext, and return whether this succeeded.
-ac_fn_c_try_link ()
-{
- as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
- rm -f conftest.$ac_objext conftest$ac_exeext
- if { { ac_try="$ac_link"
-case "(($ac_try" in
- *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
- *) ac_try_echo=$ac_try;;
-esac
-eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
-$as_echo "$ac_try_echo"; } >&5
- (eval "$ac_link") 2>conftest.err
- ac_status=$?
- if test -s conftest.err; then
- grep -v '^ *+' conftest.err >conftest.er1
- cat conftest.er1 >&5
- mv -f conftest.er1 conftest.err
- fi
- $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
- test $ac_status = 0; } && {
- test -z "$ac_c_werror_flag" ||
- test ! -s conftest.err
- } && test -s conftest$ac_exeext && {
- test "$cross_compiling" = yes ||
- test -x conftest$ac_exeext
- }; then :
- ac_retval=0
-else
- $as_echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
- ac_retval=1
-fi
- # Delete the IPA/IPO (Inter Procedural Analysis/Optimization) information
- # created by the PGI compiler (conftest_ipa8_conftest.oo), as it would
- # interfere with the next link command; also delete a directory that is
- # left behind by Apple's compiler. We do this before executing the actions.
- rm -rf conftest.dSYM conftest_ipa8_conftest.oo
- eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
- as_fn_set_status $ac_retval
-
-} # ac_fn_c_try_link
-
# ac_fn_c_check_type LINENO TYPE VAR INCLUDES
# -------------------------------------------
# Tests whether TYPE exists after having included INCLUDES, setting cache
} # ac_fn_c_check_type
+# ac_fn_c_try_link LINENO
+# -----------------------
+# Try to link conftest.$ac_ext, and return whether this succeeded.
+ac_fn_c_try_link ()
+{
+ as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+ rm -f conftest.$ac_objext conftest$ac_exeext
+ if { { ac_try="$ac_link"
+case "(($ac_try" in
+ *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+ *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+ (eval "$ac_link") 2>conftest.err
+ ac_status=$?
+ if test -s conftest.err; then
+ grep -v '^ *+' conftest.err >conftest.er1
+ cat conftest.er1 >&5
+ mv -f conftest.er1 conftest.err
+ fi
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; } && {
+ test -z "$ac_c_werror_flag" ||
+ test ! -s conftest.err
+ } && test -s conftest$ac_exeext && {
+ test "$cross_compiling" = yes ||
+ test -x conftest$ac_exeext
+ }; then :
+ ac_retval=0
+else
+ $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ ac_retval=1
+fi
+ # Delete the IPA/IPO (Inter Procedural Analysis/Optimization) information
+ # created by the PGI compiler (conftest_ipa8_conftest.oo), as it would
+ # interfere with the next link command; also delete a directory that is
+ # left behind by Apple's compiler. We do this before executing the actions.
+ rm -rf conftest.dSYM conftest_ipa8_conftest.oo
+ eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+ as_fn_set_status $ac_retval
+
+} # ac_fn_c_try_link
+
# ac_fn_c_check_func LINENO FUNC VAR
# ----------------------------------
# Tests whether FUNC exists, setting the cache variable VAR accordingly
# Set the 'development' global.
. $srcdir/../../bfd/development.sh
-# Enable -lmcheck by default (it provides cheap-enough memory
-# mangling), but turn it off for releases.
-if $development; then
- libmcheck_default=yes
-else
- libmcheck_default=no
-fi
-
- # Check whether --enable-libmcheck was given.
-if test "${enable_libmcheck+set}" = set; then :
- enableval=$enable_libmcheck; case "${enableval}" in
- yes | y) ENABLE_LIBMCHECK="yes" ;;
- no | n) ENABLE_LIBMCHECK="no" ;;
- *) as_fn_error $? "bad value ${enableval} for --enable-libmcheck" "$LINENO" 5 ;;
- esac
-fi
-
-
- if test -z "${ENABLE_LIBMCHECK}"; then
- ENABLE_LIBMCHECK=${libmcheck_default}
- fi
-
- if test "$ENABLE_LIBMCHECK" = "yes" ; then
- { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lmcheck" >&5
-$as_echo_n "checking for main in -lmcheck... " >&6; }
-if ${ac_cv_lib_mcheck_main+:} false; then :
- $as_echo_n "(cached) " >&6
-else
- ac_check_lib_save_LIBS=$LIBS
-LIBS="-lmcheck $LIBS"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h. */
-
-
-int
-main ()
-{
-return main ();
- ;
- return 0;
-}
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
- ac_cv_lib_mcheck_main=yes
-else
- ac_cv_lib_mcheck_main=no
-fi
-rm -f core conftest.err conftest.$ac_objext \
- conftest$ac_exeext conftest.$ac_ext
-LIBS=$ac_check_lib_save_LIBS
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_mcheck_main" >&5
-$as_echo "$ac_cv_lib_mcheck_main" >&6; }
-if test "x$ac_cv_lib_mcheck_main" = xyes; then :
- cat >>confdefs.h <<_ACEOF
-#define HAVE_LIBMCHECK 1
-_ACEOF
-
- LIBS="-lmcheck $LIBS"
-
-fi
-
- fi
-
-
# Check whether we will enable the inclusion of unit tests when
# compiling GDB.
# Set the 'development' global.
. $srcdir/../../bfd/development.sh
-# Enable -lmcheck by default (it provides cheap-enough memory
-# mangling), but turn it off for releases.
-if $development; then
- libmcheck_default=yes
-else
- libmcheck_default=no
-fi
-GDB_AC_LIBMCHECK(${libmcheck_default})
-
GDB_AC_SELFTEST([
srv_selftest_objs="gdbsupport/selftest.o"
])
+++ /dev/null
-dnl Copyright (C) 2012-2019 Free Software Foundation, Inc.
-dnl
-dnl This file is part of GDB.
-dnl
-dnl This program is free software; you can redistribute it and/or modify
-dnl it under the terms of the GNU General Public License as published by
-dnl the Free Software Foundation; either version 3 of the License, or
-dnl (at your option) any later version.
-dnl
-dnl This program is distributed in the hope that it will be useful,
-dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
-dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-dnl GNU General Public License for more details.
-dnl
-dnl You should have received a copy of the GNU General Public License
-dnl along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-dnl GDB_AC_LIBMCHECK([DEFAULT])
-dnl Provide an --enable-libmcheck/--disable-libmcheck set of options
-dnl allowing a user to enable this option even when building releases,
-dnl or to disable it when building a snapshot.
-dnl DEFAULT (yes/no) is used as default if the user doesn't set
-dnl the option explicitly.
-
-AC_DEFUN([GDB_AC_LIBMCHECK],
-[
- AC_ARG_ENABLE(libmcheck,
- AS_HELP_STRING([--enable-libmcheck],
- [Try linking with -lmcheck if available]),
- [case "${enableval}" in
- yes | y) ENABLE_LIBMCHECK="yes" ;;
- no | n) ENABLE_LIBMCHECK="no" ;;
- *) AC_MSG_ERROR(bad value ${enableval} for --enable-libmcheck) ;;
- esac])
-
- if test -z "${ENABLE_LIBMCHECK}"; then
- ENABLE_LIBMCHECK=[$1]
- fi
-
- if test "$ENABLE_LIBMCHECK" = "yes" ; then
- AC_CHECK_LIB(mcheck, main)
- fi
-])
--without-intel-pt\n\
"));
#endif
-#if HAVE_LIBMCHECK
- fprintf_filtered (stream, _("\
- --enable-libmcheck\n\
-"));
-#else
- fprintf_filtered (stream, _("\
- --disable-libmcheck\n\
-"));
-#endif
#if HAVE_LIBMPFR
fprintf_filtered (stream, _("\
--with-mpfr\n\
projects / binutils-gdb.git / commitdiff