-m31 rejected when building libgcc for cross compiler for s390 (31 bit) gcc 4.6.0

[John P. Hartmann]

Thanks Ian.

http://wiki.osdev.org/GCC_Cross-Compiler suggested
--enable-languages=c,c++ --without-headers --disable-nls but that made
no difference.  So I gave the target a symbolic link to /usr/include,
and then it failed in linking because of missing object decks.  Seems
like the process is building something I didn't ask for, or at least
do not want.

What I am after is in fact a cross compiler to s390 os/360 object
(well, the variety that supports long ESD names--and not the old MVS
attempt.)  As I already have a cross assembler, I guess I should
simply take the intermediary xgcc and run.

I did come across crosstool in my googling, as well as a number of
sites bemoaning the quality of documentation of gnu cross compiling.

On 22 May 2011 05:52, Ian Lance Taylor <iant@google.com> wrote:
> "John P. Hartmann" <jphartmann@gmail.com> writes:
>
>> Thanks, Ian.  That brought me further, but still no cigar.  Does the
>> following ring a bell?
>>
>> /usr/ports/gcc390/build460/./gcc/xgcc
>> -B/usr/ports/gcc390/build460/./gcc/
>> -B/usr/ports/gcc390/inst/s390-ibm-linux/bin/
>> -B/usr/ports/gcc390/inst/s390-ibm-linux/lib/ -isystem
>> /usr/ports/gcc390/inst/s390-ibm-linux/include -isystem
>> /usr/ports/gcc390/inst/s390-ibm-linux/sys-include    -g -O2 -O2  -g
>> -O2 -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE  -W -Wall -Wwrite-strings
>> -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
>> -Wold-style-definition  -isystem ./include  -fPIC -g
>> -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED
>> -fno-stack-protector -Dinhibit_libc -mlong-double-128 -I. -I.
>> -I../.././gcc -I/usr/src/gcc-4.6.0/libgcc
>> -I/usr/src/gcc-4.6.0/libgcc/. -I/usr/src/gcc-4.6.0/libgcc/../gcc
>> -I/usr/src/gcc-4.6.0/libgcc/../include
>> -I/usr/src/gcc-4.6.0/libgcc/../libdecnumber/dpd
>> -I/usr/src/gcc-4.6.0/libgcc/../libdecnumber -DHAVE_CC_TLS  -o
>> decContext.o -MT decContext.o -MD -MP -MF decContext.dep -c
>> /usr/src/gcc-4.6.0/libgcc/../libdecnumber/decContext.c
>>
>> /usr/src/gcc-4.6.0/libgcc/../libdecnumber/decContext.c:33:43: fatal
>> error: string.h: No such file or directory
>> compilation terminated.
>
> string.h has to come from a C library.  gcc does not include one.
>
> Since you are trying to build a cross-compiler to a GNU/Linux system,
> you may want to look at http://crosstool.org/ .
>
> Ian
>