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Date: Tue, 04 Mar 2003 16:59:07 -0500
To: cygwin AT cygwin DOT com
From: Andre Bleau <bleau AT igb DOT umontreal DOT ca>
Subject: [PATCH] corrects search order of directories for include files
  for gcc 3.2
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I observed that with Cygwin's gcc 3.2, /usr/include/w32api is searched 
before /usr/include, even when gcc is called without -mwin32 nor 
-mno-cygwin. If somes files exist with the same name in both 
/usr/include/w32api and /usr/include, such as mapi.h or the files in the GL 
subdirectory, the later are never used. IMO, this is wrong.

With Cygwin's gcc-2, /usr/include is searched before /usr/include/w32api 
when gcc-2 is called without -mwin32 nor -mno-cygwin.

I need this issue to be settled before I can prepare an updated version of 
the OpenGL package.

Here's a patch that sets the search order to:

gcc -mno-cygwin :
  /usr/i686-pc-mingw32/lib/../../include/w32api
  /usr/lib/gcc-lib/i686-pc-cygwin/3.2/include
  /usr/include/mingw

gcc -mwin32 :
  /usr/i686-pc-mingw32/lib/../../include/w32api
  /usr/lib/gcc-lib/i686-pc-cygwin/3.2/include
  /usr/include

"plain" gcc or gcc -mcygwin
  /usr/lib/gcc-lib/i686-pc-cygwin/3.2/include
  /usr/include
  /usr/i686-pc-cygwin/lib/../../include/w32api

I tested the patch by modifying the specs file by hand.

The patch is for /usr/src/gcc-3.2-3/gcc/config/i386/cygwin.h
----------------------------------------------------------------
diff -pu cygwin.h.orig cygwin.h
--- cygwin.h.orig       2003-03-04 15:08:38.000000000 -0500
+++ cygwin.h    2003-03-04 15:34:54.000000000 -0500
@@ -44,7 +44,8 @@ Boston, MA 02111-1307, USA.  */
    %{mno-cygwin:-D__MSVCRT__ -D__MINGW32__ %{!ansi:%{mthreads:-D_MT}}}\
    %{!mno-cygwin:-D__CYGWIN32__ -D__CYGWIN__ %{!ansi:-Dunix} -D__unix__ 
-D__unix}\
    %{mwin32|mno-cygwin:-DWIN32 -D_WIN32 -D__WIN32 -D__WIN32__ 
%{!ansi:-DWINNT}}\

-  %{!nostdinc:%{!mno-win32|mno-cygwin:-isystem ../include/w32api%s 
-isystem ../../include/w32api%s}}\
+  %{!nostdinc:%{mwin32|mno-cygwin:-isystem ../../include/w32api%s}}\
+  %{!nostdinc:%{!mwin32:%{!mno-cygwin:-idirafter ../../include/w32api%s}}}\
  "
----------------------------------------------------------------



André Bleau, Cygwin's OpenGL package maintainer.

email: bleau at igb dot umontreal dot ca
(Fight SPAM: encode your email-address)

Please address all questions and problem reports about Cygwin's OpenGL 
package to cygwin AT cygwin DOT com . 


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