When setting up avr toolchain with crossdev, the default use flags passed to the gcc package make it fail the compilation. This is caused by the openmp use flag and the error is "this gcc version can't compile programs" (don't have the exact text right now 'cause it takes a whole lot of time to compile on my box) Reproducible: Always Steps to Reproduce: 1. emerge crossdev 2. emerge -v -S --arch avr 3. watch it fail Actual Results: failed to compile gcc Expected Results: Compile the toolchain and be usable
I also encountered this bug, and, indeed, turning off the openmp USE flag on cross-avr/gcc fixed it. The exact error message is: ------ Configuring in avr/libgomp configure: creating cache ./config.cache checking for --enable-version-specific-runtime-libs... no checking for --enable-generated-files-in-srcdir... no checking build system type... x86_64-pc-linux-gnu checking host system type... avr-unknown-none checking target system type... avr-unknown-none checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for gawk... gawk checking whether make sets $(MAKE)... yes checking for avr-strip... /usr/libexec/gcc/avr/strip checking for avr-gcc... /var/tmp/portage/cross/avr/portage/cross-avr/gcc-4.4.4-r1/work/build/./gcc/xgcc -B/var/tmp/portage/cross/avr/portage/cross-avr/gcc-4.4.4-r1/work/build/./gcc/ -B/usr/avr/bin/ -B/usr/avr/lib/ -isystem /usr/avr/include -isystem /usr/avr/sys-include checking for C compiler default output file name... configure: error: in `/var/tmp/portage/cross/avr/portage/cross-avr/gcc-4.4.4-r1/work/build/avr/libgomp': configure: error: C compiler cannot create executables ------ OpenMP is of course not a lot of use on an 8-bit processor (to put it mildly), so it'd be good if crossdev turned it off by default, like all the other things it turns off.
openmp is automatically disabled now when C library lacks pthreads support http://sources.gentoo.org/eclass/toolchain.eclass?r1=1.439&r2=1.440
