Re: nvptx offloading patches [3/n], RFD

[Jakub Jelinek <jakub@redhat.com>]

On Wed, Feb 18, 2015 at 10:12:19AM +0100, Thomas Schwinge wrote:
> Do you literally have »nvptx-newlib symlinked into the gcc tree as
> newlib«?  If yes, then that should explain the problem: as I wrote in
> <http://news.gmane.org/find-root.php?message_id=%3C87egq8mir1.fsf%40schwinge.name%3E>,
> you need to »add a symbolic link to nvptx-newlib's newlib directory to
> the directory containing the GCC sources«, so not link [GCC]/newlib ->
> [newlib-nvptx], but [GCC]/newlib -> [newlib-nvptx]/newlib.  Does that
> resolve the issue?

BTW, --with-cuda-driver-{include,lib} are apparently not documented in
gcc/doc/ (--with-cuda-driver neither, but can't use that, as lib is
/usr/local/cuda-6.5/lib64 in my case), and isn't documented on wiki/Offloading
either.

../configure --target=nvptx-none --enable-as-accelerator-for=x86_64-pc-linux-gnu --with-build-time-tools=/usr/src/gcc/objnvptxinst/usr/local/nvptx-none/bin --disable-sjlj-exceptions --enable-newlib-io-long-long
make; make DESTDIR=/usr/src/gcc/objnvptxinst install

and

../configure --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu --enable-offload-targets=nvptx-none=/usr/src/gcc/objnvptxinst --disable-bootstrap --with-cuda-driver-include=/usr/local/cuda-6.5/include --with-cuda-driver-lib=/usr/local/cuda-6.5/lib64
make; make DESTDIR=/usr/src/gcc/objnvptxinst install

compilers now build, but offloading fails:

/usr/src/gcc/objnvptxinst/usr/local/bin/../libexec/gcc/x86_64-pc-linux-gnu/5.0.0//accel/nvptx-none/mkoffload @/tmp/cce9PdmR
x86_64-pc-linux-gnu-accel-nvptx-none-gcc: error: language lto not recognized
x86_64-pc-linux-gnu-accel-nvptx-none-gcc: error: language lto not recognized
mkoffload: fatal error: /usr/src/gcc/objnvptxinst/usr/local/bin/x86_64-pc-linux-gnu-accel-nvptx-none-gcc returned 1 exit status
compilation terminated.
lto-wrapper: fatal error: /usr/src/gcc/objnvptxinst/usr/local/bin/../libexec/gcc/x86_64-pc-linux-gnu/5.0.0//accel/nvptx-none/mkoffload returned 1 exit status
compilation terminated.
/usr/bin/ld: lto-wrapper failed
collect2: error: ld returned 1 exit status

Is --enable-languages=c,c++,fortran,lto required when configuring the
offload compiler?  It isn't required for intelmic.

	Jakub