Re: _GLIBCXX_DEBUG_BACKTRACE broken
On Mon, 29 Jan 2024 at 18:30, François Dumont 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 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 > >
Re: _GLIBCXX_DEBUG_BACKTRACE broken
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 ? François On 29/01/2024 11:10, Jonathan Wakely wrote: On Mon, 29 Jan 2024 at 06:13, François Dumont 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 diff --git a/libstdc++-v3/doc/xml/manual/debug_mode.xml b/libstdc++-v3/doc/xml/manual/debug_mode.xml index dadc0cd1bb4..ac15ef6f6d0 100644 --- a/libstdc++-v3/doc/xml/manual/debug_mode.xml +++ b/libstdc++-v3/doc/xml/manual/debug_mode.xml @@ -165,8 +165,8 @@ which always works correctly. It requires that you configure libstdc++ build with --enable-libstdcxx-backtrace=yes. Use -D_GLIBCXX_DEBUG_BACKTRACE to activate it. - You'll then have to link with libstdc++_libbacktrace static library - (-lstdc++_libbacktrace) to build your application. + You'll then have to link against libstdc++exp static library + (-lstdc++exp) to build your application. Using a Specific Debug Container
