使用特定的gcc工具链从源代码构建clang [英] build clang from source using specific gcc toolchain

问题描述

我正在从源代码构建clang，但是所使用的gcc 7.2构建并不存在于正常位置.我希望生成的clang++二进制文件默认情况下使用此工具链.我尝试这样做:

I'm building clang from source, but using a gcc 7.2 build that doesn't live in the normal spot. I want the resulting clang++ binary to use this toolchain by default. I tried to do:

$ export GCC_PREFIX=/path/to/gcc/7.2
$ mkdir -p build
$ cd build
$ cmake -G Ninja -DCMAKE_C_COMPILER=${GCC_PREFIX}/bin/gcc \
     -DCMAKE_CXX_COMPILER=${GCC_PREFIX}/bin/g++ \
     -DCMAKE_BUILD_TYPE=RelWithDebInfo -DLLVM_TARGETS_TO_BUILD=X86 ..

但是生成的构建只是在/usr/include/c++/4.8.5中查找标准库包含的内容，而不是像我想要的那样包含/path/to/gcc/7.2/include(并且，如路径所示，4.8.5有点旧了).有没有一种方法可以构建clang，使得生成的二进制文件将在我想要的路径中查找其包含目录?

But the resulting build just looks in /usr/include/c++/4.8.5 for standard library includes instead of /path/to/gcc/7.2/include like I wanted it to (and, as the path suggests, 4.8.5 is a bit old). Is there a way to build clang such that the resulting binary will search the path I want for its include directory?

注意，我知道我使用--gcc-toolchain=${GCC_PREFIX}运行生成的 binary .那个有效.我要做的是将其构建到二进制文件中，因此不必每次都键入它.

Note, I know I run the produced binary with --gcc-toolchain=${GCC_PREFIX}. That works. What I want to do is build that into the binary so I don't have to type it every time.

推荐答案

刚刚找到了这个.正确的方法是提供GCC_INSTALL_PREFIX:

Just found this. The correct way to do this is to provide GCC_INSTALL_PREFIX:

$ cmake -G Ninja -DCMAKE_C_COMPILER=${GCC_PREFIX}/bin/gcc \
     -DCMAKE_CXX_COMPILER=${GCC_PREFIX}/bin/g++ \

     -DGCC_INSTALL_PREFIX=${GCC_PREFIX} \

     -DCMAKE_BUILD_TYPE=RelWithDebInfo -DLLVM_TARGETS_TO_BUILD=X86 ..

那做对了.根据需要，生成的clang二进制文件的行为就像您提供了--gcc-toolchain=${GCC_PREFIX}一样.

That does the right thing. The resulting clang binary behaves as if you provided --gcc-toolchain=${GCC_PREFIX}, as desired.

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