toolchain/46261: NetBSD 6.0_BETA and -current build fails in tools on some Linux systems

[riz%NetBSD.org@localhost]

>Number:         46261
>Category:       toolchain
>Synopsis:       NetBSD 6.0_BETA and -current build fails in tools on some 
>Linux systems
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Mar 27 03:10:00 +0000 2012
>Originator:     Jeff Rizzo
>Release:        Trying to build 6.99.4
>Organization:
>Environment:
A Linux VM running CentOS 6.2 (same happens on Ubuntu 11.10)

[riz@server-76645 src]$ uname -a
Linux server-76645.localdomain 2.6.32-220.2.1.el6.x86_64 #1 SMP Fri Dec 23 
02:21:33 CST 2011 x86_64 x86_64 x86_64 GNU/Linux

>Description:
The tools build fails in gmp:

dependall ===> gmp
Cleaning stale cache files Linux-2.6.32-220.2.1.el6.x86_64-x86_64 != none
checking build system type... pentium2-unknown-linux-gnu
checking host system type... pentium2-unknown-linux-gnu
checking for a BSD-compatible install... /home/riz/obj/tooldir/bin/x86_64--netbs
d-install -c  -r
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... /home/riz/obj/tooldir/bin/nbawk
checking whether /home/riz/obj/tooldir/bin/nbmake sets $(MAKE)... no
checking whether to enable maintainer-specific portions of Makefiles... no
checking ABI=32
checking whether cc is gcc... yes
checking compiler cc -m32 -O2 -pedantic -fomit-frame-pointer ... no
checking compiler cc -O2 -pedantic -fomit-frame-pointer ... yes
checking compiler cc -O2 -pedantic -fomit-frame-pointer has sizeof(long)==4... n
o
configure: error: could not find a working compiler, see config.log for details

*** Failed target:  .configure_done
*** Failed command: (cd build && AR=ar AWK=/home/riz/obj/tooldir/bin/nbawk CC=cc
 CPPFLAGS= CXX=c++ INSTALL=/home/riz/obj/tooldir/bin/x86_64--netbsd-install\ -c\
 \ -r LDFLAGS= LEX=/home/riz/obj/tooldir/bin/nblex M4=/home/riz/obj/tooldir/bin/
nbm4 MAKE=/home/riz/obj/tooldir/bin/nbmake RANLIB=ranlib YACC=/home/riz/obj/tool
dir/bin/nbyacc PATH="/home/riz/obj/tooldir/bin:$PATH" /bin/sh /home/riz/src/tool
s/gmp/../../external/lgpl3/gmp/dist/configure --disable-shared --prefix=/home/ri
z/obj/tooldir)
*** Error code 1

Stop.
nbmake: stopped in /home/riz/src/tools/gmp


Chatting with Matthew Green, he determined that this is because 
external/lgpl3/gmp/dist/config.guess gets the archictecture wrong:

[riz@server-76645 src]$ external/lgpl3/gmp/dist/config.guess 
pentium2-unknown-linux-gnu

While the config.guess for mpfr does a better job:

[riz@server-76645 src]$ external/lgpl3/mpfr/dist/config.guess 
x86_64-unknown-linux-gnu

Replacing the config.guess for gmp with the one from mpfr helps get the build 
further, but it then dies in gcc, and I'm not sure if just swapping it in is 
even the right thing.
>How-To-Repeat:
Attempt a build of NetBSD (probably any since the gcc4.5 import) on a Linux 
system.

my build commandline:  ./build.sh -U -O ~/obj -T ~/obj/tooldir -j4 -m amd64 
tools

>Fix:
None given.