Re: mpich always injects lto flags

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On Wed, 2020-08-05 at 12:45 -0600, Christoph Junghans wrote:
> Hi,
> 
> I am trying to rebuild espresso to adapt to the recent cmake changes,
> when doing this I hit
> https://github.com/espressomd/espresso/issues/3396, which prevents us
> from compiling espresso with -lto, so I set _lto_cflags to %{nil},
> which works for the build with openmpi, but gets ignored for the mpich
> build.
> 
> I think the problem is that CMake picks up the lto flags from mpicxx
> and then puts them in
> MPI_CXX_COMPILE_OPTIONS. (Also compare mpicc -show).
> 
> So I think the fix would be to strip these flags from mpicc. Sounds reasonable?
> 
> The flags also contain
> '-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1', which effectively
> makes it depend on redhat-rpm-config. We had a similar issue in hdf5 a
> while back: https://bugzilla.redhat.com/show_bug.cgi?id=1794625
You might try %global (which has global scope) rather than %define (which has a
local scope).   Or just strip it away like you've proposed.

jeff
> 
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