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[CMake] Build LLVM from the submodule if there's no suitable version

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When RPCS3 is compiled with LLVM (default option), CMake only tries to
find LLVM on the default system installation. So the OS must have a
sytstem-wide installation of LLVM of at least version 4.0, which is not
available on many GNU/Linux distributions (e.g. Ubuntu 16.04, Debian
Stretch). If CMake can not find a suitable version, it silently falls
back to compile RPCS3 without LLVM.

This patch makes CMake defaults to compile the LLVM submodule if and
only if a suitable LLVM version is not found installed on the system.
Due to a build time check on LLVM, in-tree builds will not work when
building the submodule (LLVM does not allow in-source builds). For this
reason, the instruction for building on CMake were updated.
This commit is contained in:
Henrique Jung 2017-10-01 03:26:42 -03:00 • committed by kd-11
parent 1572d01c53
commit 76b7103fed
2 changed files with 25 additions and 1 deletions
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README.md
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@ -63,7 +63,8 @@ To initialize the repository don't forget to execute `git submodule update --ini
1) `git clone https://github.com/RPCS3/rpcs3.git` </br>
2) `cd rpcs3/` </br>
3) `git submodule update --init` </br>
4) `cmake CMakeLists.txt && make GitVersion && make` </br>
4) `cd ../ && mkdir rpcs3_build && cd rpcs3_build`
4) `cmake ../rpcs3/ && make GitVersion && make` </br>
5) Run RPCS3 with `./bin/rpcs3` </br>
If you are on MacOS and want to build with brew llvm and qt don't forget to add the following environment variables