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Make clang use libc++ by default (#5943)

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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.
This commit is contained in:
Ondřej Čertík
2017-10-25 16:19:32 -06:00
committed by Christoph Junghans
parent aa750f12de
commit 89b0a09de0
1 changed files with 4 additions and 1 deletions
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5
var/spack/repos/builtin/packages/llvm/package.py
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@@ -390,7 +390,10 @@ def cmake_args(self):
'-DLLVM_TOOL_LLDB_BUILD:Bool=OFF'])
if '+internal_unwind' not in spec:
cmake_args.append('-DLLVM_EXTERNAL_LIBUNWIND_BUILD:Bool=OFF')
if '+libcxx' not in spec:
if '+libcxx' in spec:
if spec.satisfies('@3.9.0:'):
cmake_args.append('-DCLANG_DEFAULT_CXX_STDLIB=libc++')
else:
cmake_args.append('-DLLVM_EXTERNAL_LIBCXX_BUILD:Bool=OFF')
cmake_args.append('-DLLVM_EXTERNAL_LIBCXXABI_BUILD:Bool=OFF')
if '+compiler-rt' not in spec: