ld fails to build proper executables in several cases on x64_64-w64-mingw32

[Rainer Emrich <rainer at emrich-ebersheim dot de>]

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I first discovered this by bootstrapping gcc and running the
testsuite. I got around 1200 new failures for the same gcc revision
using binutils-2.26 compared to using binutils-2.25.1, see
https://gcc.gnu.org/ml/gcc-testresults/2016-01/msg02756.html
and
https://gcc.gnu.org/ml/gcc-testresults/2016-01/msg02757.html

Most failures in the libstdc++ testsuite, 954 additional failures.

Besides the new failures, some tests which PASS and a some which FAIL
allocate huge memory spaces, over 40 GByte.

So I tried to analyze a bit. I picked a test case from the libstdc++
testsuite 22_locale/locale/cons/6.cc. Checking the preprocessed
source, the assemply and the object files for the support library and
the test case itself there's no difference. I disabled all debug
information for an easier comparison. The objects are identical for
both versions.

The culprit is the linker, I opened a bug report, which includes a
test case, see https://sourceware.org/bugzilla/show_bug.cgi?id=19531

Any idea what's going wrong here?

Rainer

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