complibs/ppl: build only C and C++ interfaces for PPL
By default, PPL wants to build interfaces for any of a variety of
langauges it finds on the local host (python, java, possibly perl, also
more esoteric languages such as ocaml and prolog).
These extra interfaces can double the compile time for the library. For
single-process builds, I found a savings of more than 40%:
default / j1: 716s total, 143.2s avg, 0.52s stdev
just_c / j1: 406s total, 81.2s avg, 0.33s stdev
just_c_cpp / j1: 413s total, 82.6s avg, 0.22s stdev
And for multi-process builds, it approached 50%:
default / j4: 625s total, 125.0s avg, 0.57s stdev
just_c / j4: 338s total, 67.6s avg, 1.25s stdev
just_c_cpp / j4: 327s total, 65.4s avg, 0.36s stdev
Since the PPL we build within ct-ng is only used by GCC, we only need to
build the C and C++ interfaces.
Signed-Off-By: Anthony Foiani <anthony.foiani@gmail.com>
1 Original patch from gentoo: gentoo/src/patchsets/gcc/4.3.1/gentoo/53_all_gcc4-superh-default-multilib.patch
2 The gcc-3.x toolchains would contain all the targets by default. With gcc-4,
3 you have to actually list out the multilibs you want or you will end up with
4 just one when using targets like 'sh4-linux-gnu'.
6 The resulting toolchain can't even build a kernel as the kernel needs to build
7 with the nofpu flag to be sure that no fpu ops are generated.
9 Here we restore the gcc-3.x behavior; the additional overhead of building all
10 of these multilibs by default is negligible.
12 http://bugs.gentoo.org/140205
14 diff -durN gcc-4.3.1.orig/gcc/config.gcc gcc-4.3.1/gcc/config.gcc
15 --- gcc-4.3.1.orig/gcc/config.gcc 2008-05-21 10:54:15.000000000 +0200
16 +++ gcc-4.3.1/gcc/config.gcc 2008-06-10 14:58:06.000000000 +0200
18 if test x${sh_multilibs} = x ; then
20 sh64-superh-linux* | \
21 - sh[1234]*) sh_multilibs=${sh_cpu_target} ;;
22 + sh[1234]*) sh_multilibs=`cd ${srcdir}/config/sh ; echo t-mlib-sh[1-4]* | sed 's:t-mlib-sh:,m:g;s: ::g'` ;;
23 sh64* | sh5*) sh_multilibs=m5-32media,m5-32media-nofpu,m5-compact,m5-compact-nofpu,m5-64media,m5-64media-nofpu ;;
24 sh-superh-*) sh_multilibs=m4,m4-single,m4-single-only,m4-nofpu ;;
25 sh*-*-linux*) sh_multilibs=m1,m3e,m4 ;;