Ondřej Čertík 89b0a09de0 Make clang use libc++ by default (#5943) ... Since LLVM 3.9 Clang can use the libc++ library by default using the CLANG_DEFAULT_CXX_STDLIB cmake configuration variable, without having to specify the -stdlib=libc++ option on the clang++ command line. This commit makes clang++ use libc++ by default for LLVM 3.9 and later if the libcxx variant is on. Fixes #5942.		2017-10-25 16:19:32 -06:00
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spack	Make clang use libc++ by default (#5943)	2017-10-25 16:19:32 -06:00