From 3d3722b4dacd8e51475c61c0f1bf1eca3c30934f Mon Sep 17 00:00:00 2001
From: Michael Droettboom <mdboom@gmail.com>
Date: Mon, 8 Apr 2013 12:18:19 -0400
Subject: [PATCH] Fixes #1884 -- Don't require a PyCXX.pc file (since it
 doesn't exist upstream and in many packages).  Don't overwrite existing
 libraries on an extension if pkg-config fails for one component.  Don't spew
 pkg-config error messages to the console.

---
 setupext.py | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/setupext.py b/setupext.py
index 63109aed297b..c8a6e5dce89a 100644
--- a/setupext.py
+++ b/setupext.py
@@ -281,7 +281,8 @@ def setup_extension(self, ext, package, default_include_dirs=[],
         use_defaults = True
         if self.has_pkgconfig:
             try:
-                output = check_output(command, shell=True)
+                output = check_output(command, shell=True,
+                                      stderr=subprocess.STDOUT)
             except subprocess.CalledProcessError:
                 pass
             else:
@@ -303,7 +304,7 @@ def setup_extension(self, ext, package, default_include_dirs=[],
                     dir = os.path.join(base, lib)
                     if os.path.exists(dir):
                         ext.library_dirs.append(dir)
-            ext.libraries = default_libraries
+            ext.libraries.extend(default_libraries)
             return True
 
         return False
@@ -321,6 +322,7 @@ def get_version(self, package):
             return output
         return None
 
+
 # The PkgConfig class should be used through this singleton
 pkg_config = PkgConfig()
 
@@ -402,13 +404,17 @@ def _check_for_pkg_config(self, package, include_file, min_version=None,
         if version is None:
             version = pkg_config.get_version(package)
 
+            if version is None:
+                raise CheckFailed(
+                    "pkg-config information for '%s' could not be found" %
+                    package)
+
         if min_version == 'PATCH':
             raise CheckFailed(
                 "Requires patches that have not been merged upstream.")
 
         if min_version:
-            if (version is not None and
-                not is_min_version(version, min_version)):
+            if (not is_min_version(version, min_version)):
                 raise CheckFailed(
                     "Requires %s %s or later.  Found %s." %
                     (package, min_version, version))
@@ -665,8 +671,17 @@ def check(self):
             return self._check_for_pkg_config(
                 'PyCXX', 'CXX/Extensions.hxx', min_version='6.2.4')
         except CheckFailed as e:
-            self.__class__.found_external = False
-            return str(e) + ' Using local copy.'
+            # Since there is no .pc file for PyCXX upstream, many
+            # distros don't package it either.  We don't necessarily
+            # need to fall back to a local build in that scenario if
+            # the header files can be found.
+            base_include_dirs = [
+                os.path.join(x, 'include') for x in get_base_dirs()]
+            if has_include_file(base_include_dirs, 'CXX/Extensions.hxx'):
+                return 'Using system CXX (version unknown, no pkg-config info)'
+            else:
+                self.__class__.found_external = False
+                return str(e) + ' Using local copy.'
 
     def add_flags(self, ext):
         if self.found_external: