[OE-core] gcc 4.8

[Mark Hatle]

I found an issue w/ the gcc 4.8 in oe-core as on Monday.  Some of my automated 
build machines are RHEL 5.9 machines.  These boxes have a host compiler that 
does not support -Wno-narrowing and -Wno-overlength-strings.  Unfortunately, 
when building target gcc (via the cross compiler) the system tries to use target 
compiler options on the system host compiler.

I tracked this down to the configure script checks support for those warnings 
(and others), but it only looks with the $CC value.  It then passes these values 
in via LOOSE_WARN and STRICT_WARN.. eventually these go through the system and 
end up in BUILD_COMPILERFLAGS via ALL_CXXFLAGS via WARN_CXXFLAGS via 
GCC_WARN_CXXFLAGS...  So configure checking only the cross compiler is the issue.

Below is the error that I got:

g++  -c   -O2 -pipe -g -fvisibility-inlines-hidden -DIN_GCC   -fno-exceptions 
-fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings 
-Wcast-qual -Wmissing-format-attribute -pedantic -Wno-long-long 
-Wno-variadic-macros -Wno-overlength-strings   -DHAVE_CONFIG_H -DGENERATOR_FILE 
-I. -Ibuild 
-I/home/nxadm/nx/yow-blade16.1/builds-2013-05-23-130402/qemuppc_world/bitbake_build/tmp/work-shared/gcc-4.8.0-r0/gcc-4.8.0/gcc 
-I/home/nxadm/nx/yow-blade16.1/builds-2013-05-23-130402/qemu
ppc_world/bitbake_build/tmp/work-shared/gcc-4.8.0-r0/gcc-4.8.0/gcc/build 
-I/home/nxadm/nx/yow-blade16.1/builds-2013-05-23-130402/qemuppc_world/bitbake_build/tmp/work-shared/gcc-4.8.0-r0/gcc-4.8.0/gcc/../include 
-I/home/nxadm/nx/yow-blade16.1/builds-2013-05-23-130402/qemuppc_world/bitbake_build/tmp/work-shared/gcc-4.8.0-r0/gcc-4.8.0/gcc/../libcpp/include 
 
-I/home/nxadm/nx/yow-blade16.1/builds-2013-05-23-130402/qemuppc_world/bitbake_build/tmp/work-shared/gcc-4.8.0-r0/gcc-4.8.0/gcc/../libdecnumber 

-I/home/nxadm/nx/yow-blade16.1/builds-2013-05-23-130402/qemuppc_world/bitbake_build/tmp/work-shared/gcc-4.8.0-r0/gcc-4.8.0/gcc/../libdecnumber/dpd 
-I../libdecnumber 
-I/home/nxadm/nx/yow-blade16.1/builds-2013-05-23-130402/qemuppc_world/bitbake_build/tmp/work-shared/gcc-4.8.0-r0/gcc-4.8.0/gcc/../libbacktrace 
    \
	-DBASEVER="\"4.8.0\"" -DDATESTAMP="\"\"" \
	-DREVISION="\"\"" \
	-DDEVPHASE="\"\"" -DPKGVERSION="\"(GCC) \"" \
	-DBUGURL="\"<http://gcc.gnu.org/bugs.html>\"" -o build/version.o 
/home/nxadm/nx/yow-blade16.1/builds-2013-05-23-130402/qemuppc_world/bitbake_build/tmp/work-shared/gcc-4.8.0-r0/gcc-4.8.0/gcc/version.c
cc1plus: error: unrecognized command line option "-Wno-narrowing"
cc1plus: error: unrecognized command line option "-Wno-overlength-strings"
make[2]: *** [build/version.o] Error 1
make[2]: *** Waiting for unfinished jobs....
/bin/sh 
/home/nxadm/nx/yow-blade16.1/builds-2013-05-23-130402/qemuppc_world/bitbake_build/tmp/work-shared/gcc-4.8.0-r0/gcc-4.8.0/gcc/../move-if-change 
tmp-optionlist optionlist
echo timestamp > s-options
make[2]: *** wait: No child processes.  Stop.
make[1]: *** [all-gcc] Error 2
make[1]: Leaving directory 
`/home/nxadm/nx/yow-blade16.1/builds-2013-05-23-130402/qemuppc_world/bitbake_build/tmp/work/ppc603e-wrs-linux/gcc/4.8.0-r0/gcc-4.8.0/build.powerpc-wrs-linux.powerpc-wrs-linux'