[SCM] GNU Autoconf source repository branch, master, updated. v2.62-77-g0b0c80f

[Eric Blake]

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- Log -----------------------------------------------------------------
commit 0b0c80f560884b9d4c0faafb15ec28d810d25f70
Author: Bruno Haible <address@hidden>
Date:   Tue Aug 19 22:16:40 2008 -0600

    Mention universal binaries in INSTALL.
    
    * doc/install.texi (Compiling For Multiple Architectures): Explain
    how to create universal binaries on MacOS X.
    
    Signed-off-by: Eric Blake <address@hidden>

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog        |    7 +++++++
 doc/install.texi |   18 +++++++++++++++++-
 2 files changed, 24 insertions(+), 1 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index b9c14bc..1a892f9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2008-08-19  Bruno Haible  <address@hidden>
+       and Peter O'Gorman  <address@hidden>
+
+       Mention universal binaries in INSTALL.
+       * doc/install.texi (Compiling For Multiple Architectures): Explain
+       how to create universal binaries on MacOS X.
+
 2008-08-19  Jim Meyering  <address@hidden>
            Eric Blake  <address@hidden>
            Ralf Wildenhues  <address@hidden>
diff --git a/doc/install.texi b/doc/install.texi
index e087629..362be59 100644
--- a/doc/install.texi
+++ b/doc/install.texi
@@ -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 +120,22 @@ architecture at a time in the source code directory.  
After you have
 installed the package for one architecture, use @samp{make distclean}
 before reconfiguring for another architecture.
 
+On MacOS X 10.5 and later systems, you can create libraries and
+executables that work on multiple system types---known as @dfn{fat} or
address@hidden binaries---by specifying multiple @option{-arch} options
+to the compiler but only a single @option{-arch} option to the
+preprocessor.  Like this:
+
address@hidden
+./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 -E" CXXCPP="g++ -E"
address@hidden example
+
+This is not guaranteed to produce working output in all cases, you may
+have to build one architecture at a time and combine the results
+using the @command{lipo} tool if you have problems.
+
 @node Installation Names
 @section Installation Names
 


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