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re PR libstdc++/35816 (libstdc++ build during bootstrap is optimizing away atomic builtin check) 

2008-04-14  Benjamin Kosnik  <bkoz@redhat.com>

	PR libstdc++/35816
	* acinclude.m4 (GLIBCXX_ENABLE_ATOMIC_BUILTINS): Set CXXFLAGS to
	-O0 when checking for atomic builtins.
	* configure: Regenerate.

From-SVN: r134297
This commit is contained in:
Benjamin Kosnik 2008-04-14 23:53:15 +00:00 committed by Benjamin Kosnik
parent 40f39798ce
commit 8edb93c423
3 changed files with 12 additions and 5 deletions
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7
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,10 @@
2008-04-14 Benjamin Kosnik <bkoz@redhat.com>
PR libstdc++/35816
* acinclude.m4 (GLIBCXX_ENABLE_ATOMIC_BUILTINS): Set CXXFLAGS to
-O0 when checking for atomic builtins.
* configure: Regenerate.
2008-04-14 Benjamin Kosnik <bkoz@redhat.com>
* include/bits/c++config: Guard _LDBL_ macros with __cplusplus.

4
libstdc++-v3/acinclude.m4
View File

@ -2292,7 +2292,7 @@ int main()
}
EOF
old_CXXFLAGS="$CXXFLAGS"
CXXFLAGS=-S
CXXFLAGS='-O0 -S'
if AC_TRY_EVAL(ac_compile); then
if grep __sync_fetch_and_add conftest.s >/dev/null 2>&1 ; then
enable_atomic_builtins=no
@ -2303,6 +2303,7 @@ EOF
atomicity_dir=cpu/generic/atomicity_builtins
fi
fi
AC_MSG_RESULT($enable_atomic_builtins)
CXXFLAGS="$old_CXXFLAGS"
rm -f conftest*
@ -2311,7 +2312,6 @@ EOF
atomicity_dir=cpu/generic/atomicity_mutex
fi
AC_LANG_RESTORE
AC_MSG_RESULT($enable_atomic_builtins)
])

6
libstdc++-v3/configure vendored
View File

@ -18104,7 +18104,7 @@ int main()
}
EOF
old_CXXFLAGS="$CXXFLAGS"
CXXFLAGS=-S
CXXFLAGS='-O0 -S'
if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
(eval $ac_compile) 2>&5
ac_status=$?
@ -18122,6 +18122,8 @@ _ACEOF
atomicity_dir=cpu/generic/atomicity_builtins
fi
fi
echo "$as_me:$LINENO: result: $enable_atomic_builtins" >&5
echo "${ECHO_T}$enable_atomic_builtins" >&6
CXXFLAGS="$old_CXXFLAGS"
rm -f conftest*
@ -18135,8 +18137,6 @@ 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
echo "$as_me:$LINENO: result: $enable_atomic_builtins" >&5
echo "${ECHO_T}$enable_atomic_builtins" >&6
if test $atomicity_dir = cpu/generic/atomicity_mutex ; then
{ echo "$as_me:$LINENO: WARNING: No native atomic operations are provided for this platform." >&5