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9c62b5eabb
libstdc++v4.6. This is quite hard to test directly, so we test for it by checking a known missing feature in that version that was added in v4.7. This should prevent users from upgrading Clang but not GCC and hosting with a too-old GCC's libstdc++ and getting strange and hard to debug errors when we switch to C++11 by default. Also, switch several of the macros I introduced to use AC_LANG_SOURCE rather than AC_LANG_PROGRAM as we don't need configure's help writing our main function (and we don't need such a function at all for most of the tests). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199313 91177308-0d34-0410-b5e6-96231b3b80d8
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