[v3] dejagnu support for simple cross compilers

[Benjamin Kosnik]

Thanks to Alexandre who pointed this out to me last night.

Now (some) cross compilers can actually be tested. I tried with
powerpc-eabism and xscale-elf.

1) for powerpc-eabism: Now getting stuff like:

/mnt/hd/ahimsa/bld-x86-x-powerpc-eabism/powerpc-eabism/libstdc++-v3/../../gcc/collect-ld: warning: cannot find entry symbol _start; defaulting to 01800074
/mnt/hd/ahimsa/bld-x86-x-powerpc-eabism/gcc/libgcc.a(eabi.o): In function `__eabi':
eabi.o(.text+0xc4): undefined reference to `__init'
/mnt/hd/ahimsa/bld-x86-x-powerpc-eabism/gcc/libgcc.a(eabi.o)(.got2+0x8): undefined reference to `__SDATA_START__'
/mnt/hd/ahimsa/bld-x86-x-powerpc-eabism/gcc/libgcc.a(eabi.o)(.got2+0xc): undefined reference to `__SBSS_END__'
/mnt/hd/ahimsa/bld-x86-x-powerpc-eabism/gcc/libgcc.a(eabi.o)(.got2+0x14): undefined reference to `__SDATA2_START__'
/mnt/hd/ahimsa/bld-x86-x-powerpc-eabism/gcc/libgcc.a(eabi.o)(.got2+0x18): undefi

I suspect this is because the newlib build dir doesn't have a crt0.o
in it.  If I remember correctly this is one of the targets where this
is vendor-supplied (oh, bother) and thus setting everything up
correctly is a bit of a pain. Geoffrey, if you can help me out here I am
pretty sure I can get this to work.

2) for xscale-elf.
Things are actually linking correctly, whoo-hoo. I am seeing some
link fails due to weird label issues:

/tmp/ccXUNwgh.o: In function `test01()':
/mnt/hd/bliss/src.gcc-merged/libstdc++-v3/testsuite/18_support/numeric_limits.cc:67: undefined reference to `LLSDA8'
/mnt/hd/bliss/src.gcc-merged/libstdc++-v3/testsuite/18_support/numeric_limits.cc:68: undefined reference to `LLSDA9'
/mnt/hd/bliss/src.gcc-merged/libstdc++-v3/testsuite/18_support/numeric_limits.cc:81: undefined reference to `LLSDA10'
/tmp/ccXUNwgh.o: In function `__FRAME_BEGIN__':
/tmp/ccXUNwgh.o(.eh_frame+0x249): undefined reference to `LLSDA11'

A bit psycho, and I won't have time to look at this for a
day or two still. Richard, does ths ring a bell? You might be able to duplicate
this with a mips-elf cross too.

put on head, will be merged to branch shortly.

tested x86/linux

2001-04-06  Benjamin Kosnik  <bkoz@redhat.com>
            Alexandre Oliva  <aoliva@redhat.com>
	
	* tests_flags.in (CROSS_LIB_PATH): Add as -B flag.

Index: tests_flags.in
===================================================================
RCS file: /cvs/gcc/gcc/libstdc++-v3/tests_flags.in,v
retrieving revision 1.18
diff -c -p -r1.18 tests_flags.in
*** tests_flags.in	2001/04/06 08:00:55	1.18
--- tests_flags.in	2001/04/06 19:35:03
*************** case ${query} in
*** 152,158 ****
      --built-library)
        LIBS="${LIB_PATH}/libstdc++.la -no-install -rpath ${GCC_LIB_PATH}"
        if test x@xcompiling@ = x1; then
!         LIBS="${LIBS} -L${CROSS_LIB_PATH}"
        fi
      case @target_os@ in
          *cygwin*)  
--- 152,158 ----
      --built-library)
        LIBS="${LIB_PATH}/libstdc++.la -no-install -rpath ${GCC_LIB_PATH}"
        if test x@xcompiling@ = x1; then
!         LIBS="${LIBS} -B${CROSS_LIB_PATH}/"
        fi
      case @target_os@ in
          *cygwin*)