[CMake] Issues with adding -flto in CMAKE_C[XX]_FLAGS_RELEASE

[Daniel Schepler]

I've managed to create a small test case that reproduces the issue, and posted a bug report: http://www.cmake.org/Bug/view.php?id=15547 .  It would seem that the issue occurs if you try to update CMAKE_AR and CMAKE_RANLIB after a previous run of CMake - though not if you include those settings on the first CMake run.
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Daniel Schepler
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From: CMake [cmake-bounces at cmake.org] on behalf of Daniel Schepler [dschepler at scalable-networks.com]
Sent: Wednesday, April 29, 2015 11:20 AM
To: cmake at cmake.org
Subject: [CMake] Issues with adding -flto in CMAKE_C[XX]_FLAGS_RELEASE

I just tried an experiment on our code base, adding -flto to the default values of CMAKE_C_FLAGS_RELEASE and CMAKE_CXX_FLAGS_RELEASE, and setting CMAKE_AR to /usr/bin/gcc-ar-5, CMAKE_RANLIB to /usr/bin/gcc-ranlib-5.  However, make VERBOSE=1 shows that the intermediate static libraries are still being created using /usr/bin/ar; and I can't find any other instances of /usr/bin/ar in CMakeCache.txt.  That results in lots of BFD warnings showing up, and linker errors at the end.

Is there something I'm missing that would make this able to work; or is this configuration not supported (yet)?
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Daniel Schepler
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