Supporting multiple GNU toolchains

[Kyle Kloepper <Kyle.Kloepper@xxxxxxxxxxxx>]

In my build environment I have multiple GNU toolchains. For instance gcc 4.4 to compile kernel, 4.6 for general programs, and 4.7 for experimental work. 

To make full use of these toolchains when packaging components, I am looking to do two things:

1. Set a default toolchain used by all invocations of rpmbuild (which may or may not be the same toolchain used when I compile outside of rpmbuild)
2. Allow a SPEC file to easily select a specific toolchain to use. This selection would override the default toolchain for the machine

My plan to accomplish this was to redefine the %configure macro in /etc/rpm/macros.toolchain and add the following:

%_CC /opt/gcc4_6/bin/gcc  

%_CXX /opt/gcc4_6/bin/g++ 

%configure \                   

  CC=%{_CC} ; export CC ; \    

  CXX=%{_CXX} ; export CXX ; \

  ... 

Then in a specific SPEC file the toolchain could be selected by changing the %_CC and %_CXX variables:

...

%define _CC /usr/bin/gcc  

%define _CXX /usr/bin/g++

... 

Is this the best way to allow multiple toolchains to coexist for packaging with RPM?

-Kyle

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