AMD r600 gpu backend on Gentoo

The current situation is rather messy with respect to the AMD r600 GPU backend : it has been merged on llvm, but not yet released. The problem is that, on gentoo, the USE flag “r600-llvm-compiler” requires this backend. As a result, it was not possible since ~christmas to compile mesa-9999 with it.

The backend is merged, but still depends on a configure flag to be compiled, and as such, merging llvm-9999 won’t help you. So the first thing is to enable it. What i do is to have a copy on my local overlay with the following change:

--- /usr/portage/sys-devel/llvm/llvm-9999.ebuild 2013-02-03 01:01:30.000000000 +0100
+++ llvm-9999-r1.ebuild 2013-02-13 23:21:58.450578986 +0100
@@ -107,6 +107,7 @@

 src_configure() {
 local CONF_FLAGS="--enable-shared
+ --enable-experimental-targets=R600
 $(use_enable !debug optimized)
 $(use_enable debug assertions)

But then, mesa-9999[r600-llvm-compiler] will not compile neither because of some compilation problem due to some desynchronisation between mesa and llvm.

Until today! A commit done today fix those compilation stuff, thanx Tom 🙂

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