[CMake] working around gcc version bug in xocde generator

[Simmons, Aaron]

Ah, the bug didn't say that it had been released yet, just that it was in cvs.  Sorry for the trouble.  Thanks!

From: David Cole [mailto:david.cole at kitware.com]
Sent: Tuesday, March 30, 2010 7:59
To: Simmons, Aaron
Cc: cmake at cmake.org
Subject: Re: [CMake] working around gcc version bug in xocde generator

With CMake 2.8.1, you can, in your CMakeLists.txt file:
set(CMAKE_XCODE_ATTRIBUTE_GCC_VERSION "4.2")
Or, more precisely:
set(CMAKE_XCODE_ATTRIBUTE_GCC_VERSION "com.apple.compilers.gcc.4_2")

This is part of the bug fix for http://public.kitware.com/Bug/view.php?id=9125 which was included in the 2.8.1 release (rc3 and later...).

It is Xcode-generator specific, though, and has no effect on generated files for other build systems.


HTH,
David


On Mon, Mar 29, 2010 at 4:12 PM, Simmons, Aaron <asimmons at rosettastone.com<mailto:asimmons at rosettastone.com>> wrote:
My project requires using gcc 4.0 when compiling on Mac OS X, as it has to support 10.4.  This works fine for the makefile generator, but it breaks with the XCode generator for Xcode 3.2 as the default gcc is v4.2.

Other posts on this list indicates that it's a bug in the Xcode generator.  I would like to workaround this issue somehow until a new version of cmake is released.

One poster suggested using gcc's -V option, which allows forcing the gcc version.  I've tried injecting this into the CMAKE_CXX_FLAGS like this:
       if (${CMAKE_GENERATOR} MATCHES "Xcode")
           set(CMAKE_CXX_FLAGS "-V 4.0 ${CMAKE_CXX_FLAGS}")
       endif(${CMAKE_GENERATOR} MATCHES "Xcode")

However, this creates a new error:
       '-V' must come at the start of the command line

It seems that the CMAKE_CXX_FLAGS are always appended to the constructed gcc command.  Is there some way that I can prepend flags (that is, put them at the very beginning of the command-line)?


Thanks,
aaron
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