On Fri, Sep 24, 2021 at 3:45 AM Eugene Rozenfeld via Gcc <gcc@gcc.gnu.org> wrote: > > I ran into a bug with lto: no line number info gets emitted when building my > project with -flto and -g (with gcc 8.2). I'd like to provide a repro in the > bug report but I don't know if there is an easy way to collect everything. > The instructions at https://gcc.gnu.org/bugs/ seem to cover non-lto > compilations. > For MSVC there is an easy way to collect linker repro files for ltcg: > https://docs.microsoft.com/en-us/cpp/overview/how-to-report-a-problem-with-the-visual-cpp-toolset?view=msvc-160#link-repros > Is there something similar for GCC?
We generally prefer preprocessed sources here as with other bugs - for LTO that might mean including quite a bunch of files but there's instructions on the wiki on how to reduce LTO testcases: https://gcc.gnu.org/wiki/A_guide_to_testcase_reduction#Reducing_LTO_bugs Note that for mingw and cygwin you likely run into the issue that LTO does not support -g there (sic), see a similar issue for darwin (PR82005), there must be a bug for mingw/cygwin as well but I can't find it right now. Richard. > Thanks, > > Eugene
