[Openmp-dev] Large Refactor of CMake build system [FIXED]

[Hans Wennborg]

+Jonathan

On Wed, Jul 22, 2015 at 5:43 PM, C Bergström <cbergstrom at pathscale.com> wrote:
> <big fat snip>
> ....
> Attached are 2 potential patches which resolve the issue we're hitting
> (I let someone else decide which one or modify as needed)
>
> Summary:
> libomp_check_linker_flag rewrites src_to_link.c and CMakeLists.txt in
> build directory for test project, but cmake does not rebuild the
> project. The root cause is that on some filesystems (ext3, reiserfs)
> timestamp resoultion is 1 second. So cmake does not rebuild test
> project if check takes less than 1 second.
>
> Comments: These checks are somewhat stupid and it would be nice to be
> able to disable them. I don't know of any other llvm project
> essentially doing this
> write small CMake file just for testing; run cmake; test; etc
>
> Solution:
> The work-around is to build test projects in different subdirs.
>
> One patch uses variable name instead of flag name for subdirectory
> names, to avoid use of special symbols in directory name (-- , /).
>
> Please decide and push ASAP.