pasha needs libstdc++

[JensTimmerman]

Pasha is distributing it's own version of google-sparsehash, and depends on a gnu specific extention of libstdc++.

This is ok for GCC-based builds, but fails (or uses the system libstdc++ if available) with the Intel compiler.

[JensTimmerman]

We should build libstdc++ with intel compilers and add it as a dependency.

[boegel]

This issue become apparent when trying to build Pasha on a SL6 system, which has a recent libstdc++.

Pasha ships on old version of google-sparsehash, which requires the ext/hash_fun.h include file. In recent versions of libstdc++, this include is no longer available, but split up into ext/hash_map and ext/hash_set.

So, next to adding libstdc++ as dependency for Pasha, the patch file that was now used for builds of Pasha with recent GCC versions (https://github.com/hpcugent/easybuild/blob/develop/easybuild/easyconfigs/p/Pasha/gcc-hash_fun-map-set.patch), will also need to be applied for Intel version.

The patch file should be renamed to reflect that it's not tied to GCC, but to libstdc++ instead.

[boegel]

Suggestion: build libstdc++ with GCC as build dependency and with dummy toolkit, and use that as dependency for Pasha (and google-sparsehash).
Then there's no need to build libstdc++ with Intel compilers, which is going to be a nightmare.

[JensTimmerman]

Should be fixed (for our needs) by merging this pull request.

[boegel]

fix indentation here

[boegel]

This is a workaround, not a real fix. The real fix would be to build (an old version of) libstdc++ with GCC as build dependency, and use that as dependency for Pasha when it's being built with the Intel compilers.

[boegel]

rename this patch file to 'old-libstdc++-hash_fun-map-set.patch', since it's not tied to gcc but to libstdc++

and then also adjust the patch file used in the goalf easyconfig for Pasha

[JensTimmerman]

fixed remarks.

[boegel]

seperate ticket opened for building stand-alone libstdc++ module