问题
From the docs:
CPATH specifies a list of directories to be searched as if specified with -I, but after any paths given with -I options on the command line. This environment variable is used regardless of which language is being preprocessed.
On my machine, I'd like to e.g. cross-compile or, otherwise have an versioned set of alternative includes. I'd like to use those to compile other people's code.
Concretely, I have several different versions of python, and their related Python.h files.
$ python setup.py pillow fails because the include it finds first isn't the one needed. (/usr/local/include has an old Python.h, but I need /usr/local/include/Python2.7 to "win").
Adding /usr/local/include/Python2.7 to CPATH (or C_INCLUDE_PATH) doesn't work because it's placed later.
As far as I can see, this isn't python-specific -- surely there's a way to force GCC to have paths prior to -I / CPATH?
回答1:
Its a bit hacky, but you can add it to your compiler var
Makefile syntax
CC = gcc -Ipath
Or
export CC="gcc -Ipath"
Or g++ for the CXX variable.
来源：https://stackoverflow.com/questions/17510472/adding-an-include-directory-to-gcc-before-i