升级GCC 6.2编译LLVM的问题

[ 55%] Built target RTInterception.x86_64

[ 55%] Building ASM object projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.x86_64.dir/sanitizer_linux_x86_64.S.o

cc: error trying to exec 'cc1': execvp: No such file or directory

make[2]: *** [projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.x86_64.dir/sanitizer_linux_x86_64.S.o] Error 1

make[1]: *** [projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.x86_64.dir/all] Error 2

make: *** [all] Error 2

1 下载llvm

• LLVM source code
• Clang source code
• compiler-rt source code

下载上面三个包得到

cfe-3.9.1.src.tar.xz
compiler-rt-3.9.1.src.tar.xz
llvm-3.9.1.src.tar.xz

解压

xz -d llvm-3.9.1.src.tar.xz
xz -d compiler-rt-3.9.1.src.tar.xz
xz -d cfe-3.9.1.src.tar.xz
tar xf llvm-3.9.1.src.tar
tar xf compiler-rt-3.9.1.src.tar
tar xf cfe-3.9.1.src.tar

将compiler-rt-3.9.1.src复制到llvm-3.9.1.src/tools下，并重命名为clang。将cfe-3.9.1.src复制到llvm-3.9.1.src/projects下，将重命名为compiler-rt。

cd llvm-3.9.1.src
mkdir build
cd build
cmake ../ -DCMAKE_CXX_COMPILER=/usr/local/bin/c++ -DCMAKE_C_COMPILER=/usr/local/bin/gcc
make

因为自己编译安装的gcc 6.2，原来的/usr/bin/gcc还在，所以指定自己编译器。（GCC 6.2 安装请点这里）。

出现如下错误：

[ 55%] Built target RTInterception.x86_64
[ 55%] Building ASM object projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.x86_64.dir/sanitizer_linux_x86_64.S.o
cc: error trying to exec 'cc1': execvp: No such file or directory
make[2]: *** [projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.x86_64.dir/sanitizer_linux_x86_64.S.o] Error 1
make[1]: *** [projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonNoTermination.x86_64.dir/all] Error 2
make: *** [all] Error 2

添加cc1的链接

ln -s /usr/local/libexec/gcc/x86_64-pc-linux-gnu/6.2.0/cc1 /usr/local/bin/cc1

再次执行make，成功编译。为测试多个版本，不进行make install。