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Summary:
Current implementation does not work if CMAKE_OSX_SYSROOT is not specified.
It silently generates invalid command with the following flags:
`-std=c++11 -lc++ -gline-tables-only -isysroot -fsanitize=address,fuzzer`
and then fails with the following error:
```
warning: no such sysroot directory: '-fsanitize=address,fuzzer' [-Wmissing-sysroot]"
<...>/RepeatedBytesTest.cpp:5:10: fatal error: 'assert.h' file not found
#include <assert.h>
^~~~~~~~~~
1 error generated.
```
However, if you have Command Line Tools installed, you have '/usr/include' dir.
In that case, it is not necessary to specify isysroot path.
Also, with the patch, in case of '/usr/include' does not exist, the '-sysroot'
path would be resolved automatically in compiler-rt/cmake/base-config-ix.cmake.
For more context, see the comment at `compiler-rt/cmake/base-config-ix.cmake#L76`
Reviewers: kcc, george.karpenkov
Reviewed By: kcc, george.karpenkov
Differential Revision: https://reviews.llvm.org/D37721
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@313033 91177308-0d34-0410-b5e6-96231b3b80d8
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