Problem cross-compiling trunk for bfin

["Henderson, Stuart" <Stuart dot Henderson at analog dot com>]

Hi,
I'm relatively new to GCC, so please excuse my ignorance.

I've been trying to cross-compile GCC-trunk for Blackfin with uClibc, but it's currently failing and doesn't appear to have worked for quite some time.  The most recent release tags are all fine, but I'm keen to get trunk building again.

The first problem I'm seeing is when building unwind-dw2.c (configure line and error message at the bottom).  The problem seems to be caused by a change in the generation of tm.h in the following check in:

r160579 | rsandifo | 2010-06-10 21:23:43 +0100 (Thu, 10 Jun 2010) | 7 lines
gcc/
    * configure.ac (tm_include_list): Add insn-constants.h.
    * configure: Regenerate.
    * Makefile.in (GTM_H): Move insn-constants.h here from...
    (TM_H): ...here.
    * mkconfig.sh: Remove special handling for insn-constants.h.

The change moves the inclusion of "insn-constants.h" from being conditional on:
#if defined IN_GCC && !defined GENERATOR_FILE && !defined USED_FOR_TARGET
to just:
#if defined IN_GCC

This causes insn-constants.h to be included here which defines various register macros that can then clash with the enum (of registers in the gregset_t array) in uClibc's sys/ucontext.h.

Although I've only hit this with bfin, it seems like it could easily hit other architectures.  Not having a deep enough understanding of the gcc ecosystem nor why the change was made, I was hoping someone could explain the best way to resolve this?

Thanks for any help,
Stu




After installing target/uclibc headers for the sysroot, I configure gcc:

/home/shender/gnu/toolchain/gcc-4.6/configure --build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu --target=bfin-uclinux --prefix=/home/shender/gnu/toolchain/bfin-uclinux --disable-libstdcxx-pch --with-sysroot=/home/shender/gnu/toolchain/bfin-uclinux/bfin-uclinux/runtime --enable-threads=posix --enable-languages=c --disable-threads --disable-libmudflap --disable-libgomp --disable-shared --enable-clocale=generic --disable-symvers --disable-libssp --disable-libffi --disable-libgcj --enable-version-specific-runtime-libs --enable-__cxa_atexit

and then make, which fails with:

/home/shender/gnu/toolchain/gcc_build-4.6/./gcc/xgcc -B/home/shender/gnu/toolchain/gcc_build-4.6/./gcc/ -B/home/shender/gnu/toolchain/bfin-uclinux/bfin-uclinux/bin/ -B/home/shender/gnu/toolchain/bfin-uclinux/bfin-uclinux/lib/ -isystem /home/shender/gnu/toolchain/bfin-uclinux/bfin-uclinux/include -isystem /home/shender/gnu/toolchain/bfin-uclinux/bfin-uclinux/sys-include    -g -O2 -mcpu=bf532-none -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  -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I. -I../../.././gcc -I/home/shender/gnu/toolchain/gcc-4.6/libgcc -I/home/shender/gnu/toolchain/gcc-4.6/libgcc/. -I/home/shender/gnu/toolchain/gcc-4.6/libgcc/../gcc -I/home/shender/gnu/toolchain/gcc-4.6/libgcc/../include  -DHAVE_CC_TLS -DUSE_EMUTLS -o unwind-dw2.o -MT unwind-dw2.o -MD -MP -MF unwind-dw2.dep -fexceptions -c /home/shender/gnu/toolchain/gcc-4.6/libgcc/../gcc/unwind-dw2.c
In file included from /home/shender/gnu/toolchain/bfin-uclinux/bfin-uclinux/sys-include/ucontext.h:25:0,
                 from /home/shender/gnu/toolchain/bfin-uclinux/bfin-uclinux/sys-include/signal.h:351,
                 from /home/shender/gnu/toolchain/gcc-4.6/libgcc/../gcc/config/bfin/linux-unwind.h:31,
                 from /home/shender/gnu/toolchain/gcc-4.6/libgcc/../gcc/unwind-dw2.c:333:
/home/shender/gnu/toolchain/bfin-uclinux/bfin-uclinux/sys-include/sys/ucontext.h:39:3: error: expected identifier before numeric constant
make[4]: *** [unwind-dw2.o] Error 1
make[4]: Leaving directory `/home/shender/gnu/toolchain/gcc_build-4.6/bfin-uclinux/bf532-none/libgcc'
make[3]: *** [multi-do] Error 1
make[3]: Leaving directory `/home/shender/gnu/toolchain/gcc_build-4.6/bfin-uclinux/libgcc'
make[2]: *** [all-multi] Error 2
make[2]: Leaving directory `/home/shender/gnu/toolchain/gcc_build-4.6/bfin-uclinux/libgcc'
make[1]: *** [all-target-libgcc] Error 2
make[1]: Leaving directory `/home/shender/gnu/toolchain/gcc_build-4.6'
make: *** [all] Error 2