build problems on powerpc.

[Phil Edwards]

On Mon, Jul 08, 2002 at 11:12:36PM +0100, Nic Ferrier wrote:
> The build error occurs whilst doing this:
> 
> /home/nferrier/projects/gnu/gcc/cvsobj/gcc/xgcc -shared-libgcc -B/home/nferrier/projects/gnu/gcc/cvsobj/gcc/ -nostdinc++ -L/home/nferrier/projects/gnu/gcc/cvsobj/powerpc-unknown-linux-gnu/libstdc++-v3/src -L/home/nferrier/projects/gnu/gcc/cvsobj/powerpc-unknown-linux-gnu/libstdc++-v3/src/.libs -B/usr/local/powerpc-unknown-linux-gnu/bin/ -B/usr/local/powerpc-unknown-linux-gnu/lib/ -isystem /usr/local/powerpc-unknown-linux-gnu/include -nostdinc++ -I/home/nferrier/projects/gnu/gcc/cvsobj/powerpc-unknown-linux-gnu/libstdc++-v3/include/powerpc-unknown-linux-gnu -I/home/nferrier/projects/gnu/gcc/cvsobj/powerpc-unknown-linux-gnu/libstdc++-v3/include -I../../../../gccstable-cvs/libstdc++-v3/libsupc++ -I../../../../gccstable-cvs/libstdc++-v3/libmath -g -O2 -D_GNU_SOURCE -fno-implicit-templates -Wall -Wno-format -W -Wwrite-strings -Winline -fdiagnostics-show-location=once -ffunction-sections -fdata-sections -g -c ../../../../gccstable-cvs/libstdc++-v3/src/complex_io.cc -o complex_io.o >/dev/null 2>&1
> 
> 
> Here's the error text produced by the Makefile:
> 
> make[3]: *** [complex_io.lo] Error 1

Unfortunately this doesn't tell us /what/ went wrong, only that compilation
failed.  The error message from the compiler is sent to /dev/null, as you
can see from the command invocation.  (This is supposed to be a libtool
feature; there are arguments and reasons for and against in the main gcc
list archives if you're curious and bored.)

The upshot is that compiling complex_io.cc worked with -fPIC -DPIC, but
failed without it.  That usually points to a target-specific compiler bug,
but you'll have to run that command by hand, without the ">/dev/null 2>&1"
at the end, to see the error messages.

Ideally --enable-maintainer-mode would make the /dev/null bit go away, but
we don't have that much control over libtool.


Phil

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