Please make LLVM binary names configurable

[nomeata]

While the name of the GCC binary, for example, is configurable in settings, this is not true for the LLVM binaries (llc and opt); these are hard-coded in source:/compiler/main/SysTools.lhs

This is required, e.g., for Debian where "opt" might be any llvm version and only "opt-3.0" would work. Ideally, we can set the name with ./configure and it would apply both for the build of ghc and the final ghc binary.

[igloo]

Replying to nomeata:

Ideally, we can set the name with ./configure and it would apply both for the build of ghc and the final ghc binary.

To clarify: We shouldn't use it when using the bootstrapping compiler: That version of GHC may require a different LLVM to be used, and the build system assumes that it already works without needing any special flags.

[kgardas]

I'm testing attached patch, which I hope satisfies igloo's requirement above and which once properly tested I'd like to commit and submit for inclusion usual git way.

[dterei]

Any update Karel, is the patch attached good to apply?

[kgardas]

Hi David, the patch is indeed good. I've been able to build on ARM/Linux with LLVM version not in PATH. Thanks for committing it.

[dterei]

Committed: e6bfc5962e7d889a9cafcf1829c5177206ccabfd