gobject-introspection-1.42.0_rarecase.patch

You may not need this, but if you experience error during gir generation 
and there is garbled path involved then try this

--- giscanner/dumper.py	Sun Aug 31 21:31:38 2014
+++ giscanner/dumper.py	Tue Sep 30 13:38:16 2014
@@ -20,6 +20,7 @@
 #
 
 import os
+import re
 import sys
 import subprocess
 import shutil
@@ -185,6 +186,16 @@
 
     # Private API
 
+    # there still other ways such -include _path_ -I _path_ and so on
+    # but below is the most commonly used by autotools
+    flagpat = re.compile(r'(?<=\B-I|\B-L)(/\S*?)(?=\s|$)')
+    flagpat2 = re.compile(r'\B-([I|L]\S;\S*?)(?=\s|$)')
+    def _winpath_from_msys(self, m):
+        shell = os.environ.get('SHELL', 'sh.exe')
+        proc = subprocess.Popen([shell,'-c','\'$COMSPEC','//c','echo',
+                                m.group(1),'\''],stdout=subprocess.PIPE)
+        return proc.communicate()[0].strip()
+
     def _generate_tempfile(self, tmpdir, suffix=''):
         tmpl = '%s-%s%s' % (self._options.namespace_name,
                             self._options.namespace_version, suffix)
@@ -218,9 +229,15 @@
         pkgconfig_flags = self._run_pkgconfig('--cflags')
         args.extend([utils.cflag_real_include_path(f) for f in pkgconfig_flags])
         cppflags = os.environ.get('CPPFLAGS', '')
+        if os.environ.get('MSYSTEM') == 'MINGW32':
+            cppflags = re.sub(self.flagpat, self._winpath_from_msys, cppflags)
+            cppflags = re.sub(self.flagpat2,'',cppflags)
         for cppflag in cppflags.split():
             args.append(cppflag)
         cflags = os.environ.get('CFLAGS', '')
+        if os.environ.get('MSYSTEM') == 'MINGW32':
+            cflags = re.sub(self.flagpat, self._winpath_from_msys, cflags)
+            cflags = re.sub(self.flagpat2,'',cflags)
         for cflag in cflags.split():
             args.append(cflag)
         for include in self._options.cpp_includes:
@@ -269,12 +286,21 @@
                 args.append('-export-dynamic')
 
         cppflags = os.environ.get('CPPFLAGS', '')
+        if os.environ.get('MSYSTEM') == 'MINGW32':
+            cppflags = re.sub(self.flagpat, self._winpath_from_msys, cppflags)
+            cppflags = re.sub(self.flagpat2, '', cppflags)
         for cppflag in cppflags.split():
             args.append(cppflag)
         cflags = os.environ.get('CFLAGS', '')
+        if os.environ.get('MSYSTEM') == 'MINGW32':
+            cflags = re.sub(self.flagpat, self._winpath_from_msys, cflags)
+            cflags = re.sub(self.flagpat2, '', cflags)
         for cflag in cflags.split():
             args.append(cflag)
         ldflags = os.environ.get('LDFLAGS', '')
+        if os.environ.get('MSYSTEM') == 'MINGW32':
+            ldflags = re.sub(self.flagpat,self._winpath_from_msys,ldflags)
+            ldflags = re.sub(self.flagpat2, '', ldflags)
         for ldflag in ldflags.split():
             args.append(ldflag)
 
--- giscanner/scannermain.py	Tue Sep 23 10:40:35 2014
+++ giscanner/scannermain.py	Tue Sep 30 13:40:23 2014
@@ -23,6 +23,7 @@
 import errno
 import optparse
 import os
+import re
 import shutil
 import subprocess
 import sys
@@ -57,10 +58,19 @@
 def process_cflags_end(option, opt, value, parser):
     pass
 
+flagpat = re.compile(r'^(/\S*?)(?=\s|$)')
+def _winpath_from_msys(m):
+    shell = os.environ.get('SHELL', 'sh.exe')
+    proc = subprocess.Popen([shell,'-c','\'$COMSPEC','//c','echo',
+                            m.group(1),'\''],stdout=subprocess.PIPE)
+    return proc.communicate()[0].strip()
 
 def process_cpp_includes(option, opt, value, parser):
     cpp_includes = getattr(parser.values, option.dest)
-    cpp_includes.append(os.path.realpath(value))
+    if os.environ.get('MSYSTEM') == 'MINGW32':
+        cpp_includes.append(os.path.realpath(re.sub(flagpat,_winpath_from_msys,value)))
+    else:
+        cpp_includes.append(os.path.realpath(value))
 
 
 def get_preprocessor_option_group(parser):