I get the folling error: make[5]: Entering directory '/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/build/x86_64-w64-mingw32/libstdc++-v3/src/c++20' /bin/sh ../../libtool --tag CXX --tag disable-shared --mode=compile /var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/build/./gcc/xgcc -shared-l ibgcc -B/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/build/./gcc -nostdinc++ -L/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826 /work/build/x86_64-w64-mingw32/libstdc++-v3/src -L/var/tmp/portage/cross-x86_64- w64-mingw32/gcc-13.2.1_p20230826/work/build/x86_64-w64-mingw32/libstdc++-v3/src/.libs -L/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/build/x86_64-w64-mingw32/libstdc++-v3/libsupc++/.libs -L/usr/x86_64-w64-mingw32/lib -L/usr/mingw/lib -isystem /usr/x86_64-w64-mingw32/include -isystem /usr/mingw/include -B/usr/x86_64-w64-mingw32/bin/ -B/usr/x86_64-w64-mingw32/lib/ -isystem /usr/x86_64-w64-mingw32/include -isystem /usr/x86_64-w64-mingw32/sys-include -I/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/gcc-13-20230826/libstdc++-v3/../libgcc -I/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/build/x86_64-w64-mingw32/libstdc++-v3/include/x86_64-w64-mingw32 -I/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/build/x86_64-w64-mingw32/libstdc++-v3/include -I/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/gcc-13-20230826/libstdc++-v3/libsupc++ -std=gnu++20 -prefer-pic -D_GLIBCXX_SHARED -fno-implicit-templates -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2 -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -frandom-seed=tzdb.lo -fimplicit-templates -g -O2 -I. -c /var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/gcc-13-20230826/libstdc++-v3/src/c++20/tzdb.cc libtool: compile: /var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/build/./gcc/xgcc -shared-libgcc -B/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/build/./gcc -nostdinc++ -L/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/build/x86_64-w64-mingw32/libstdc++-v3/src -L/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/build/x86_64-w64-mingw32/libstdc++-v3/src/.libs -L/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/build/x86_64-w64-mingw32/libstdc++-v3/libsupc++/.libs -L/usr/x86_64-w64-mingw32/lib -L/usr/mingw/lib -isystem /usr/x86_64-w64-mingw32/include -isystem /usr/mingw/include -B/usr/x86_64-w64-mingw32/bin/ -B/usr/x86_64-w64-mingw32/lib/ -isystem /usr/x86_64-w64-mingw32/include -isystem /usr/x86_64-w64-mingw32/sys-include -I/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/gcc-13-20230826/libstdc++-v3/../libgcc -I/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/build/x86_64-w64-mingw32/libstdc++-v3/include/x86_64-w64-mingw32 -I/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/build/x86_64-w64-mingw32/libstdc++-v3/include -I/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/gcc-13-20230826/libstdc++-v3/libsupc++ -std=gnu++20 -D_GLIBCXX_SHARED -fno-implicit-templates -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi=2 -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -frandom-seed=tzdb.lo -fimplicit-templates -g -O2 -I. -c /var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/gcc-13-20230826/libstdc++-v3/src/c++20/tzdb.cc -o tzdb.o /var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/gcc-13-20230826/libstdc++-v3/src/c++20/tzdb.cc:640:9: error: ‘mutex’ does not name a type; did you mean ‘minutes’? 640 | mutex infos_mutex; | ^~~~~ | minutes /var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/gcc-13-20230826/libstdc++-v3/src/c++20/tzdb.cc: In member function ‘void std::chrono::time_zone::_Impl::RulesCounter<_Tp>::lock()’: /var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/gcc-13-20230826/libstdc++-v3/src/c++20/tzdb.cc:642:23: error: ‘infos_mutex’ was not declared in this scope 642 | void lock() { infos_mutex.lock(); } | ^~~~~~~~~~~ /var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/gcc-13-20230826/libstdc++-v3/src/c++20/tzdb.cc: In member function ‘void std::chrono::time_zone::_Impl::RulesCounter<_Tp>::unlock()’: /var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/gcc-13-20230826/libstdc++-v3/src/c++20/tzdb.cc:643:25: error: ‘infos_mutex’ was not declared in this scope 643 | void unlock() { infos_mutex.unlock(); } | ^~~~~~~~~~~ make[5]: *** [Makefile:754: tzdb.lo] Error 1 make[5]: Leaving directory '/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-13.2.1_p20230826/work/build/x86_64-w64-mingw32/libstdc++-v3/src/c++20' make[4]: *** [Makefile:791: all-recursive] Error 1 make[3]: *** [Makefile:576: all-recursive] Error 1 make[2]: *** [Makefile:501: all] Error 2 make[1]: *** [Makefile:12295: all-target-libstdc++-v3] Error 2 make[1]: *** Waiting for unfinished jobs....
Created attachment 871480 [details] emerge-info.txt.gz
same problem also with gcc-13.2.1_p20231014
No full build log? Can't tell what configuration got used without it (I'd stick with minimal'ish USE for mingw cross, support is flaky). Anyhow, gcc-13.2.1_p20231014 built fine for me: $ emerge -pvq cross-x86_64-w64-mingw32/gcc [ebuild R ] cross-x86_64-w64-mingw32/gcc-13.2.1_p20231014 USE="cxx fortran nls nptl openmp ssp -ada -cet -custom-cflags -d -debug (-default-stack-clash-protection) -default-znow -doc -fixed-point -go -graphite (-hardened) -ieee-long-double -jit -libssp -lto -modula2 (-multilib) -objc -objc++ -objc-gc (-pch) -pgo (-pie) -sanitize -systemtap -test -valgrind -vanilla -vtv -zstd" Albeit I used gcc:13 to build and haven't tried gcc:12 from your emerge --info, so maybe that's related (may want to try selecting 13). Not that I really plan to look into cross issues myself outside dev-util/mingw64-toolchain, was just giving it a quick try in case it'd be completely broken.
I am trying to build as # emerge -pv cross-x86_64-w64-mingw32/gcc [ebuild NS ~] cross-x86_64-w64-mingw32/gcc-13.2.1_p20231014:13::crossdev [9.3.0-r2:9.3.0::crossdev, 10.3.0-r2:10::crossdev, 11.3.0:11::crossdev, 12.3.1_p20230526:12::crossdev] USE="cxx fortran nls nptl openmp ssp -ada -cet -custom-cflags -d -debug -default-stack-clash-protection -default-znow -doc -fixed-point -go -graphite -hardened -ieee-long-double -jit -libssp -lto -modula2% -multilib -objc -objc++ -objc-gc (-pch) -pgo -pie -sanitize -systemtap -test -valgrind -vanilla -vtv -zstd" 0 KiB so it looks like with the same USEFLAGS you are using. I have also tested with gcc-13 without success. I'll try to rebuild the whole toolchain with crossdev by deleting the current one first.
I solved finally the problem after reinstalling the full toolchain. Probably the problem was due to the too-old mingw64-runtime version which was 6.0.0-r3 (now is 11.0.0). It works also with gcc-12
