On Mon, 29 Jan 2024 at 18:30, François Dumont <frs.dum...@gmail.com> wrote: > > I had missed it, thanks. > > Here is a patch to fix debug mode doc then. > > libstdc++: Fix _GLIBCXX_DEBUG_BACKTRACE macro documentation > > libstdc++-v3/ChangeLog: > > * doc/xml/manual/debug_mode.xml: Link against libstdc++exp.a to use > _GLIBCXX_DEBUG_BACKTRACE macro. > > Ok to commit ?
Yes please - thanks. > > François > > On 29/01/2024 11:10, Jonathan Wakely wrote: > > On Mon, 29 Jan 2024 at 06:13, François Dumont <frs.dum...@gmail.com> wrote: > >> Hi > >> > >> I'm trying to use _GLIBCXX_DEBUG_BACKTRACE to debug some crash in debug > >> mode. > >> > >> So I buit library with --enable-libstdcxx-backtrace=yes > >> > >> But when I build any test I have: > >> > >> /usr/bin/ld: /tmp/cctvPvlb.o: in function > >> `__gnu_debug::_Error_formatter::_Error_formatter(char const*, unsigned > >> int, char const*)': > >> /home/fdumont/dev/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/formatter.h:597: > >> undefined reference to `__glibcxx_backtrace_create_state' > >> /usr/bin/ld: > >> /home/fdumont/dev/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/debug/formatter.h:598: > >> undefined reference to `__glibcxx_backtrace_full' > >> > >> -lstdc++_libbacktrace does not help as it cannot find it. > > You need to use -lstdc++exp.a instead, as documented at > > https://gcc.gnu.org/gcc-14/changes.html#libstdcxx > > > > I changed this with > > https://gcc.gnu.org/g:b96b554592c5cbb6a2c1797ffcb5706fd295f4fd > >
