如何使用非系统gcc构建clang+LLVM

Question

我正在尝试切换到/usr/local/bin/gcc中的gcc47+设置。默认的系统gcc是/usr/bin/gcc中的4.4.6。

类似的头文件：

/usr/include/c++/4.4.4/bits/stl_pair.h /usr/local/include/c++/4.7.1/bits/stl_pair.h

我尝试用cd /apps/llvmbuild ; /apps/llvm/configure --prefix=/apps/llvmbuild --enable-optimized --enable-cxx11 --enable-docs=no --enable-targets=host-only --disable-assertions CPPFLAGS=-I/usr/local/include/ CXXFLAGS=-I/usr/local/include/ 构建llvm clang

然后cd /apps/llvmbuild ; make -j12 ENABLE_OPTIMIZED=1 DISABLE_ASSERTIONS=1

但我收到的错误显示它正在4.4.6目录中搜索c++文件：/usr/lib/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/exception_ptr.h

locate exception_ptr.h
/usr/include/c++/4.4.4/exception_ptr.h
/usr/local/include/c++/4.7.1/bits/exception_ptr.h

Answer 1

使用CC和CXX环境变量。信息见configure --help：

Some influential environment variables:
  CC          C compiler command
  ...
  CXX         C++ compiler command
Use these variables to override the choices made by `configure' or to help
it to find libraries and programs with nonstandard names/locations.

类似这样的东西：

CXX=/usr/local/bin/g++ CC=/usr/local/bin/gcc /apps/llvm/configure --your --other --options