sys-devel/clang: Include all experimental targets in -9999

sys-devel/clang/clang-9999.ebuild

@@ -18,8 +18,10 @@ EGIT_REPO_URI="https://git.llvm.org/git/clang.git
  https://github.com/llvm-mirror/clang.git"
 
 # Keep in sync with sys-devel/llvm
+ALL_LLVM_EXPERIMENTAL_TARGETS=( AVR Nios2 RISCV WebAssembly )
 ALL_LLVM_TARGETS=( AArch64 AMDGPU ARM BPF Hexagon Lanai Mips MSP430
- NVPTX PowerPC Sparc SystemZ X86 XCore )
+ NVPTX PowerPC Sparc SystemZ X86 XCore
+ "${ALL_LLVM_EXPERIMENTAL_TARGETS[@]}" )
 ALL_LLVM_TARGETS=( "${ALL_LLVM_TARGETS[@]/#/llvm_targets_}" )
 LLVM_TARGET_USEDEPS=${ALL_LLVM_TARGETS[@]/%/?}
 
@@ -125,7 +127,10 @@ multilib_src_configure() {
  -DCLANG_RESOURCE_DIR="../../../../lib/clang/${clang_version}"
 
  -DBUILD_SHARED_LIBS=ON
- -DLLVM_TARGETS_TO_BUILD="${LLVM_TARGETS// /;}"
+ # cheap hack: LLVM combines both anyway, and the only difference
+ # is that the former list is explicitly verified at cmake time
+ -DLLVM_TARGETS_TO_BUILD=""
+ -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD="${LLVM_TARGETS// /;}"
  -DLLVM_BUILD_TESTS=$(usex test)
 
  # these are not propagated reliably, so redefine them