Supporting multiple GNU toolchains

[Kyle Kloepper]

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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