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Re: document how to create universal binaries

From: Bruno Haible
Subject: Re: document how to create universal binaries
Date: Sun, 17 Aug 2008 15:04:08 +0200
User-agent: KMail/1.5.4

Andreas Schwab wrote:
> It is preferred to pass variable settings as arguments ...

You're right, of course. Here is a revised patch.

2008-08-17  Bruno Haible  <address@hidden>

        * doc/install.texi (Compiling For Multiple Architectures): Explain how
        to create universal binaries on MacOS X.

--- doc/install.texi.bak        2008-03-14 01:46:05.000000000 +0100
+++ doc/install.texi    2008-08-17 15:02:18.000000000 +0200
@@ -6,7 +6,7 @@
 @unnumbered Installation Instructions
 Copyright @copyright{} 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004,
-2005, 2006, 2007 Free Software Foundation, Inc.
+2005, 2006, 2007, 2008 Free Software Foundation, Inc.
 This file is free documentation; the Free Software Foundation gives
 unlimited permission to copy, distribute and modify it.
@@ -120,6 +120,18 @@
 installed the package for one architecture, use @samp{make distclean}
 before reconfiguring for another architecture.
+On MacOS X systems, you can create libraries and executables that work
+on multiple system types -- known as "fat" or "universal" binaries --
+by specifying multiple @option{-arch} options to the compiler but only
+a single @option{-arch} option to the preprocessor.  Like this:
+./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
+            CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
+            CPP="gcc -arch ppc -E" \
+            CXXCPP="g++ -arch ppc -E"
address@hidden example
 @node Installation Names
 @section Installation Names

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