Custom script when using libcmini

[th-otto]

Just seen while trying to build musl for a different platform: they use a script that looks basically like

#!/bin/sh
exec "${REALGCC:-gcc}" "$@" -specs "/usr/lib/musl-gcc.specs"

And a spec file like:

%rename cpp_options old_cpp_options

*cpp_options:
-nostdinc -isystem /usr/include -isystem include%s %(old_cpp_options)

*cc1:
%(cc1_cpu) -nostdinc -isystem /usr/include -isystem include%s

*link_libgcc:
-L/usr/lib -L .%s

*libgcc:
libgcc.a%s %:if-exists(libgcc_eh.a%s)

*startfile:
%{!shared: /usr/lib/Scrt1.o} /usr/lib/crti.o crtbeginS.o%s

*endfile:
crtendS.o%s /usr/lib/crtn.o

*link:
-dynamic-linker /lib/ld-musl-x86_64.so.1 -nostdlib %{shared:-shared} %{static:-static} %{rdynamic:-export-dynamic}

Maybe we could supply something similar for using libcmini, with a spec file that sets up the modified include paths, libraries, startup code etc. . It could also handle multilib library paths even if libcmini is installed in some non-standard place. That should simplify its use in a lot of projects.