Adding an include directory to gcc before -I

Question

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?

export CC="gcc -I/my/path"

Marc Glisse
– Marc Glisse

2013-07-07 08:52:18 +00:00
Commented Jul 7, 2013 at 8:52 — Marc Glisse
– Marc Glisse, Commented Jul 7, 2013 at 8:52

technosaurus · Accepted Answer · 2013-07-07 08:54:32Z

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.

answered Jul 7, 2013 at 8:54

technosaurus

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1 Comment

Jeremy Dunck Over a year ago

Hacky indeed, but I agree it would work. Seems quite weird for there not to just be a switch analogous to -I. :-/

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