[Bug ld/19480] New: [2.26.51 regression] ld creates wrong output for libstdc++6.dll for mingw32 (32-bit)

[daniel.f.starke at freenet dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=19480

            Bug ID: 19480
           Summary: [2.26.51 regression] ld creates wrong output for
                    libstdc++6.dll for mingw32 (32-bit)
           Product: binutils
           Version: 2.26
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: daniel.f.starke at freenet dot de
  Target Milestone: ---

Compiling a Linux -> mingw32-w64 cross-compiler works fine with binutils 2.25.1
but results in a libstdc++6.dll which is less than half the size without debug
symbols and crashes on DLL entry point. This problem only occurs for 32-bit
target, not for 64-bit target.

Compiled GCC 5.3.0 as
../../src/gcc-5.3.0/configure --enable-languages=c,c++ --enable-seh-exceptions
--enable-threads=posix --disable-nls --enable-shared=libstdc++ --enable-static
--enable-fully-dynamic-string --enable-lto --enable-plugin --enable-libgomp
--with-dwarf2 --disable-win32-registry --enable-version-specific-runtime-libs
--prefix=/mingw --with-sysroot=/mingw --target=x86_64-w64-mingw32
--enable-targets=all --enable-checking=release
--with-gmp=/new-gcc/lib/gmp-5.0.5 --with-mpfr=/new-gcc/lib/mpfr-2.4.2
--with-mpc=/new-gcc/lib/mpc-0.9 --with-isl=/new-gcc/lib/isl-0.12.2
--with-cloog=/new-gcc/lib/cloog-0.18.3 --with-host-libstdcxx='-lstdc++
-lsupc++' --disable-cloog-version-check --enable-cloog-backend=isl
on Linux (Xubuntu 14.04.3 LTS).
All system libraries where compiled with
-O3 -mtune=core2 -march=core2 -mstackrealign -fomit-frame-pointer
-Wno-maybe-uninitialized -flto -flto-partition=none -fno-builtin-stpcpy

Binutils was in both cases (version 2.25.1 and 2.26.51) configured as
configure --enable-lto --enable-plugin --disable-nls
--target=x86_64-w64-mingw32
--enable-targets=x86_64-w64-mingw32,i686-w64-mingw32 --with-sysroot=$PREFIX
--prefix=$PREFIX "--with-gmp=/new-gcc/lib/gmp-5.0.5"
"--with-mpfr=/new-gcc/lib/${MPFR}" "--with-mpc=/new-gcc/lib/mpc-0.9"
"--with-isl=/new-gcc/lib/isl-0.12.2" "--with-cloog=/new-gcc/lib/cloog-0.18.3"
"--with-host-libstdcxx=-lstdc++ -lsupc++" --disable-cloog-version-check
--enable-cloog-backend=isl

I first reported this as GCC bug until I found out that it was a binutils
regression by using an older version of binutils.

See related GCC bug report https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69284

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