[pypy-commit] cffi default: setup.py: use pkg-config for libffi include dir

[scottt]

Author: Scott Tsai <scottt.tw at gmail.com>
Branch: 
Changeset: r466:198f114397db
Date: 2012-06-19 01:45 +0800
http://bitbucket.org/cffi/cffi/changeset/198f114397db/

Log:	setup.py: use pkg-config for libffi include dir

	Some Linux distros don't install ffi.h in the default header search
	path. This patch tries to use pkg-config(1) to find the correct
	include dir and does nothing if either pkg-config or libffi.pc isn't
	available. Distros that need this include Fedora, Red Hat and
	apparently Archlinux. Should fix cffi bitbucket issue#2.

	Tested on Fedora 17, Ubuntu 10.04 and Ubuntu 12.04.

diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,6 @@
 import sys, os
+import subprocess
+import errno
 
 
 sources = ['c/_ffi_backend.c']
@@ -21,6 +23,18 @@
     sources.extend(os.path.join(COMPILE_LIBFFI, filename)
                    for filename in os.listdir(COMPILE_LIBFFI)
                    if filename.lower().endswith('.c'))
+else:
+    try:
+        p = subprocess.Popen(['pkg-config', '--cflags-only-I', 'libffi'],
+                             stdout=subprocess.PIPE, stderr=open('/dev/null', 'w'))
+    except OSError, e:
+        if e.errno != errno.ENOENT:
+            raise
+    else:
+        t = p.stdout.read().strip()
+        if p.wait() == 0 and t:
+            # '-I/usr/...' -> '/usr/...'
+            include_dirs.append(t[2:])
 
 
 if __name__ == '__main__':