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Old 10-11-2011, 09:13 PM
Sedat Dilek
 
Default Bug#644986: i386: Compiling gcc-snapshots from upstream with multiarch-toolchain?

On Tue, Oct 11, 2011 at 9:53 PM, Jonathan Nieder <jrnieder@gmail.com> wrote:
> reassign 644986 general
> severity 644986 critical
> merge 637232 644986
> quit
>
> Sedat Dilek wrote:
>
>> I played again with CFLAGS_FOR_TARGET and CXXFLAGS_FOR_TARGET by exporting them.
> [...]
>> -B/usr/lib/${HOST_SYSTEM_MULTIARCH_TYPE} ...
>> ...does NOT catch the problem with crt*.o files.
>
> Last time we went through this, didn't we discover that one has to set
>
> *FLAGS_FOR_TARGET (instead of CFLAGS_FOR_TARGET or CXXFLAGS_FOR_TARGET)
>
> and
>
> *on the "make" command line (instead of through the environment or as
> *a ./configure argument)
>
> ? *Yes, I know it is clunky.
>
> Reassigning to "general" because the underlying problem (Debian as a
> whole is moving to multiarch paths, and we don't provide enough help
> with building upstream toolchains that don't know about that) is not
> at all specific to libc6-dev. *Progress in the form of code or
> documentation, in Debian or upstream, would be welcome as always.
>
> Cheers,
> Jonathan
>

I re-reflected on experiences from #637218 and #629819.

Attached is v7 of my build-script.

I had success with:

HOST_SYSTEM_MULTIARCH_TYPE=$(dpkg-architecture -qDEB_HOST_MULTIARCH)

MULTIARCH_FLAGS="-B/usr/lib/${HOST_SYSTEM_MULTIARCH_TYPE}
-I/usr/include/${HOST_SYSTEM_MULTIARCH_TYPE}"

export CFLAGS="-g -O2"
export CXXFLAGS="${CFLAGS}"
export CFLAGS_FOR_TARGET="${CFLAGS} ${MULTIARCH_FLAGS}"
export CXXFLAGS_FOR_TARGET="${CXXFLAGS} ${MULTIARCH_FLAGS}"

...and...

make FLAGS_FOR_TARGET="${FLAGS_FOR_TARGET} ${MULTIARCH_FLAGS}"
-j${MAKE_JOBS} 2>&1 | tee ${BUILD_LOG_FILE}

...and...

# cat /usr/bin/gcc-4.7
#!/bin/sh

exec /opt/gcc-4.7/bin/gcc-4.7 -B/usr/lib/i386-linux-gnu
-I/usr/include/i386-linux-gnu "$@"

...and...

# cat /usr/bin/g++-4.7
#!/bin/sh

exec /opt/gcc-4.7/bin/g++-4.7 -B/usr/lib/i386-linux-gnu
-I/usr/include/i386-linux-gnu "$@"

Building mesa-from-git was fine.

- Sedat -

P.S.: build-script (v7) and make-log (v7) attached

$ egrep 'CFLAGS|CXXFLAGS|FLAGS_FOR_TARGET' gcc-build/config.log
ac_cv_env_CFLAGS_set=set
ac_cv_env_CFLAGS_value='-g -O2'
ac_cv_env_CXXFLAGS_set=set
ac_cv_env_CXXFLAGS_value='-g -O2'
CFLAGS='-g -O2'
CFLAGS_FOR_BUILD='-g -O2'
CFLAGS_FOR_TARGET='-g -O2 -B/usr/lib/i386-linux-gnu
-I/usr/include/i386-linux-gnu'
CXXFLAGS='-g -O2'
CXXFLAGS_FOR_BUILD='-g -O2'
CXXFLAGS_FOR_TARGET='-g -O2 -B/usr/lib/i386-linux-gnu
-I/usr/include/i386-linux-gnu'
DEBUG_PREFIX_CFLAGS_FOR_TARGET='
FLAGS_FOR_TARGET=' -B$(build_tooldir)/bin/ -B$(build_tooldir)/lib/
-isystem $(build_tooldir)/include -isystem
$(build_tooldir)/sys-include'
LDFLAGS_FOR_TARGET='
SYSROOT_CFLAGS_FOR_TARGET='
 

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