[PATCH] D15598: [Driver] Make AddCXXStdlibLibArgs responsible for handling -static-libstdc++.

[Alexey Samsonov via cfe-commits]

samsonov created this revision.
samsonov added reviewers: rafael, compnerd.
samsonov added a subscriber: cfe-commits.

After this change, AddCXXStdlibLibArgs will check the presence of
-static-libstdc++ flag and, if necessary, wrap -lc++/-lstdc++ in
-Bstatic/-Bdynamic to force static linking of C++ standard library.

It's no longer necessary to copy this code around across toolchains
(unless toolchain is overriding AddCXXStdlibLibArgs).

This change has an important consequnce: if the user provides "-lstdc++"
manually (i.e. it's not added automatically when we're linking C++ binary),
then "-static-libstdc++" *will* work as expected.

Other than that, the change attempts to preserve the existing behavior.

http://reviews.llvm.org/D15598

Files:
  lib/Driver/CrossWindowsToolChain.cpp
  lib/Driver/ToolChain.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/Tools.cpp
  test/Driver/static-libstdcxx.c

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