How to build clang + LLVM with non system gcc

Question

I am trying to switch to gcc47+ setup in /usr/local/bin/gcc. The default system gcc is 4.4.6 in /usr/bin/gcc.

Similarly header files :

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

I tried to build llvm clang with 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/

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

but I am getting errors that show it is searching for c++ files in the 4.4.6 directory : /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

user2288008 · Accepted Answer · 2013-08-12 08:11:40Z

1

Use CC and CXX environment variables. See configure --help for info:

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.

Something like this:

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

answered Aug 12, 2013 at 8:11

user2288008

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