Build multilib gcc RPMs for both i686 and x86_64 in just one step

[Basin Ilya]

Hi.

I need to build gcc RPMs from source including libgcc.i686 and
libstdc++.i686

I don't want to run rpmbuild or mock twice with different arch argument.
One is long enough. Besides, the build directory already contains all
the needed files after %build phase:

./obj-x86_64-redhat-linux/x86_64-redhat-linux/32/libstdc++-v3/src/.libs/libstdc++.so.6.0.22
    ./obj-x86_64-redhat-linux/x86_64-redhat-linux/32/libgcc/32/libgcc_s.so.1

The spec file from gcc-6.1.1-2.fc24.src.rpm suggests some support for
that. It has multilib_64_archs and multilib_32_arch macros, but I don't
know how to use them.

[Jason L Tibbitts III]

> > > > > "BI" == Basin Ilya  writes:

BI> Hi.  I need to build gcc RPMs from source including libgcc.i686 and
BI> libstdc++.i686

RPM will only build for a single architecture, with the possibility of
some subpackages being noarch.

BI> I don't want to run rpmbuild or mock twice with different arch
BI> argument.

Well, I don't believe you have any alternative.

You could of course produce some subpackage which contains the i686
files, but the arch of the resulting RPM would still be x86_64 and that
would not be what Fedora calls multilib.  But maybe you're taking that
term to mean something else in this context.

- J<