6f73144dfe
During the clang/llvm 3.9.0 import, the build structure for it was completely revamped. This broke the native-xtools target. It first attempts to build libllvmminimal, then the llvm-tblgen and clang-tblgen executables, but these fail to link because they are linked to the 'full' libllvm by default, as they normally are during the 'world' stage. To make these link against libllvmminimal instead, define TOOLS_PREFIX, similarly as during the bootstrap-tools phase. The value itself is empty, as we don't really want to use a prefix. Reviewed by: imp PR: 215684 MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D9026
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