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Date: Mon, 9 Jan 2006 10:58:00 +0100
From: Peter Ekberg <peda AT lysator DOT liu DOT se>
To: cygwin AT cygwin DOT com
Subject: cpp does not honor the -undef option.
Message-ID: <20060109095759.GB24524@sellafield.lysator.liu.se>
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Hello!

I recently tried to build a package that was using cpp for other
purposes than preprocessing C files. Its configure script was
looking for a way to not have cpp predefine anything, and it
specifically tried the -undef option, but failed. From reading the
docs, I couldn't figure out why. Here's a quote from "info cpp":

'-undef'
     Do not predefine any system-specific or GCC-specific macros.  The
     standard predefined macros remain defined.  *Note Standard
     Predefined Macros::.

So I searched the web a bit and figured that I could probably fix
it in the specs file. I realise that the specs file probably isn't
the canonical place to change this, but I'll leave that to the gcc
maintainer.

Attached is a patch for the specs file that wraps all old define
rules for cpp inside the following:

%{!undef:old define rules}

I don't know if this is the correct thing to do, but it works for
me<TM>.

Cheers,
Peter

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--- /usr/lib/gcc/i686-pc-cygwin/3.4.4/specs.orig	2005-06-08 00:02:40.001000000 +0200
+++ /usr/lib/gcc/i686-pc-cygwin/3.4.4/specs	2006-01-05 11:33:49.087107900 +0100
@@ -15,7 +15,7 @@
  as %(asm_options) %m.s %A }
 
 *cpp:
-%(cpp_cpu) %{posix:-D_POSIX_SOURCE}   %{mno-win32:%{mno-cygwin: %emno-cygwin and mno-win32 are not compatible}}   %{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:-idirafter ../include/w32api%s -idirafter ../../include/w32api%s}}
+%(cpp_cpu) %{!undef:%{posix:-D_POSIX_SOURCE}   %{mno-win32:%{mno-cygwin: %emno-cygwin and mno-win32 are not compatible}}   %{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:-idirafter ../include/w32api%s -idirafter ../../include/w32api%s}}
 
 *cpp_options:
 %(cpp_unique_options) %1 %{m*} %{std*&ansi&trigraphs} %{W*&pedantic*} %{w} %{f*} %{g*:%{!g0:%{!fno-working-directory:-fworking-directory}}} %{O*} %{undef}


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