diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 38953def3252..d96bc28576be 100644 --- a/configure.ac +++ b/configure.ac @@ -7379,6 +7379,55 @@ if test "$GCC" = yes && test "$COM_IS_CLANG" != TRUE; then fi AC_SUBST([HAVE_BROKEN_GCC_WMAYBE_UNINITIALIZED]) +dnl Check for <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87296#c5> "[8/9/10/11 Regression] +dnl -Wstringop-overflow false positive due to using MEM_REF type of &MEM" (fixed in GCC 11), which +dnl hits us e.g. with GCC 10 and --enable-optimized at +dnl +dnl In file included from include/rtl/string.hxx:49, +dnl from include/rtl/ustring.hxx:43, +dnl from include/osl/file.hxx:35, +dnl from include/codemaker/global.hxx:28, +dnl from include/codemaker/options.hxx:23, +dnl from codemaker/source/commoncpp/commoncpp.cxx:24: +dnl In function ‘char* rtl::addDataHelper(char*, const char*, std::size_t)’, +dnl inlined from ‘static char* rtl::ToStringHelper<const char [N]>::addData(char*, const char*) [with long unsigned int N = 3]’ at include/rtl/stringconcat.hxx:147:85, +dnl inlined from ‘char* rtl::OStringConcat<T1, T2>::addData(char*) const [with T1 = const char [3]; T2 = rtl::OString]’ at include/rtl/stringconcat.hxx:226:103, +dnl inlined from ‘rtl::OStringBuffer& rtl::OStringBuffer::append(rtl::OStringConcat<T1, T2>&&) [with T1 = const char [3]; T2 = rtl::OString]’ at include/rtl/strbuf.hxx:599:30, +dnl inlined from ‘rtl::OString codemaker::cpp::scopedCppName(const rtl::OString&, bool)’ at codemaker/source/commoncpp/commoncpp.cxx:53:55: +dnl include/rtl/stringconcat.hxx:78:15: error: writing 2 bytes into a region of size 1 [-Werror=stringop-overflow=] +dnl 78 | memcpy( buffer, data, length ); +dnl | ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~ +HAVE_BROKEN_GCC_WSTRINGOP_OVERFLOW= +if test "$GCC" = yes && test "$COM_IS_CLANG" != TRUE; then + AC_MSG_CHECKING([whether $CXX_BASE might report false -Werror=stringop-overflow=]) + AC_LANG_PUSH([C++]) + save_CXXFLAGS=$CXXFLAGS + CXXFLAGS="$CXXFLAGS $CXXFLAGS_CXX11 -Werror -Wstringop-overflow" + if test "$ENABLE_OPTIMIZED" = TRUE; then + CXXFLAGS="$CXXFLAGS -O2" + else + CXXFLAGS="$CXXFLAGS -O0" + fi + dnl Test code taken from <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87296#c0>: + AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ + void fill(char const * begin, char const * end, char c); + struct q { + char ids[4]; + char username[6]; + }; + void test(q & c) { + fill(c.ids, c.ids + sizeof(c.ids), '\0'); + __builtin_strncpy(c.username, "root", sizeof(c.username)); + } + ]])], [AC_MSG_RESULT([no])], [ + HAVE_BROKEN_GCC_WSTRINGOP_OVERFLOW=TRUE + AC_MSG_RESULT([yes]) + ]) + CXXFLAGS=$save_CXXFLAGS + AC_LANG_POP([C++]) +fi +AC_SUBST([HAVE_BROKEN_GCC_WSTRINGOP_OVERFLOW]) + dnl =================================================================== dnl CPU Intrinsics support - SSE, AVX dnl =================================================================== |