[CMake] Add option to switch default C++ stdlib

Description

[CMake] Add option to switch default C++ stdlib

With this option one can optionally override the architecture dependent
default library to use if no -stdlib= is provided on compiler invocation.

Differential Revision: http://reviews.llvm.org/D15920

Details

Committed
HahnfeldFeb 11 2016, 11:48 PM
Differential Revision
D15920: [CMake] Add option to switch default C++ stdlib
Parents
rL260661: tests: Add explicit -stdlib=libstdc++ to tests that require it
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