How to build clang with clang?

问题:

I allready build clang(3.2) with MSVC and MinGW succesfully. But I think it's not the "purely" clang. So could someone give me some instructions or materials about how to use clang to build clang(Windows/Linux)? And could we use clang indepently(Not depent on GCC or MSVC). Thanks all!

回答1:

Well get an older version of clang like 3.1. (You can pretty much install any version that comes precompiled for your OS)

Get the sources for a newer version like 3.2.

Then (i like cmake+ninja ( http://clang.llvm.org/docs/HowToSetupToolingForLLVM.html))

if you unpacked llvm source to ~/llvm_source/llvm

cd ~/llvm_source
mkdir build
cd build
CXX=clang++ CC=clang cmake -G Ninja ../llvm -DCMAKE_BUILD_TYPE=Release
ninja

If you want it for make

CXX=clang++ CC=clang cmake ../llvm -DCMAKE_BUILD_TYPE=Release
make

Thats it.

Have fun.

回答2:

The current method (as of 27th Feb 17') seems to be as follows,

cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++  $LLVM_SRC_DIR # -G Ninja

Where CMAKE_C_COMPILER and CMAKE_CXX_COMPILER are CMake variables define by -D. Somehow, these variables don't appear in llvm_src/CMakeLists.txt