Bug 557236 – cross-i686-w64-mingw32/gcc: no shared libstdc++-6.dll

• Product: Gentoo Linux
• Status: RESOLVED DUPLICATE

[Description David Korth 2015-08-10 15:46:25 UTC]

When building an i686-w64-mingw32 toolchain with crossdev, I noticed that libstdc++-6.dll (and I think a few other DLLs) don't get installed. This results in executables that aren't usable unless I compile with -static-libgcc and -static-libstdc++.

Expected results: libstdc++-6.dll is installed in the i686-w64-mingw32 root.

Actual results: libstdc++-6.dll is missing.

I'm able to work around this by pausing crossdev's emerge right before it wipes the temporary directory and copying the DLLs manually, but I'd prefer if crossdev installed the DLLs itself.

[Comment 1 SpanKY 2015-08-16 15:24:10 UTC]

pretty sure we haven't ever built shared gcc libs for mingw targets

crossdev itself doesn't copy/install any files

[Comment 2 Alon Bar-Lev (RETIRED) 2015-08-17 10:53:14 UTC]

hmmm... I cannot actually build c++ now with latest gcc's libsanitizer.

sanitizer_libc.cc

// Make the compiler think that something is going on there.
static inline void break_optimization(void *arg) {
#if SANITIZER_WINDOWS
  // FIXME: make sure this is actually enough.
  __asm;
#else
  __asm__ __volatile__("" : : "r" (arg) : "memory");
#endif
}

/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-4.9.3/work/gcc-4.9.3/libsanitizer/sanitizer_common/sanitizer_libc.cc: In function ‘void __sanitizer::break_optimization(void*)’:
/var/tmp/portage/cross-x86_64-w64-mingw32/gcc-4.9.3/work/gcc-4.9.3/libsanitizer/sanitizer_common/sanitizer_libc.cc:21:8: error: expected ‘(’ before ‘;’ token
   __asm;
        ^

which is true :)

[Comment 3 Alon Bar-Lev (RETIRED) 2015-08-17 10:58:09 UTC]

(In reply to Alon Bar-Lev from comment #2)
> which is true :)

yes, mingw patches are not merged[1], it assumes it is built using msvc, good we have sanitize USE.

[1] https://github.com/Alexpux/MINGW-packages/blob/master/mingw-w64-gcc/port-sanitizer-to-mingw.all.patch

[Comment 4 Alon Bar-Lev (RETIRED) 2015-08-17 11:25:41 UTC]

$ equery files cross-x86_64-w64-mingw32/gcc-4.9.3 | grep dll
/usr/lib/gcc/x86_64-w64-mingw32/4.9.3/libgcc_s_seh-1.dll
/usr/lib/gcc/x86_64-w64-mingw32/4.9.3/libstdc++-6.dll
/usr/lib/gcc/x86_64-w64-mingw32/4.9.3/libstdc++.dll.a
/usr/share/gdb/auto-load/usr/lib64/gcc/x86_64-w64-mingw32/4.9.3/libstdc++.dll.a-gdb.py

I guess you want these to be /usr/x86_64-w64-mingw32/usr/bin with all .dll but we do not have such so far :)

vapier do we want to create such, do we want to?

so far I just copied manually whatever I needed to my own root.

[Comment 5 Sergei Trofimovich (RETIRED) 2019-12-22 23:55:42 UTC]

*** This bug has been marked as a duplicate of bug 549994 ***