On Fri, Feb 20, 2015 at 22:48:52 +0300, Ilya Verbin wrote: > On Fri, Feb 20, 2015 at 18:05:01 +0300, Ilya Verbin wrote: > > On Thu, Feb 19, 2015 at 13:17:37 +0100, Thomas Schwinge wrote: > > > My asumption is that it is always safe to install non-native (that is > > > cross) GCC installations into the same prefix. (Which would resolve this > > > problem of clashing file names for target and offloading compilers for > > > good.) > > > > > > So, the next question is, instead of this special handling, why can't we > > > require the offloading compilers to always be configured as cross > > > compilers? Or, why is it a requirement that the intelmic offloading > > > compiler is configured as a native compiler? > > > > If I understand correctly, to build a cross compiler, we need to specify a > > path > > to the target sysroot, even for x86_64-pc-linux-gnu to > > x86_64-intelmic-linux-gnu > > cross. Or is it possible to build a cross compiler without --with-sysroot ? > > To be precise, for the cross compiler we need to specify a path to > --with-build-time-tools (rather than --with-sysroot). The problem is that for > Intel MIC there are no special as/ld/etc. So, is there an elegant way to > build > a cross compiler with host's build time tools?
Probably one can build an offloading cross compiler as: configure --target=x86_64-intelmic-linux-gnu --enable-as-accelerator-for=x86_64-pc-linux-gnu --with-build-time-tools=/usr/bin/ ? But I'm getting errors for such configuration :( In file included from ../../../gcc/libgcc/gthr.h:148:0, from ../../../gcc/libgcc/libgcov-interface.c:27: ./gthr-default.h:35:21: fatal error: pthread.h: No such file or directory compilation terminated. make[2]: *** [_gcov_dump.o] Error 1 make[2]: Leaving directory `/build/x86_64-intelmic-linux-gnu/libgcc' make[1]: *** [all-target-libgcc] Error 2 make[1]: Leaving directory `/build' make: *** [all] Error 2 I really want to remove the intelmicemul target, since there is no difference in the compiler between real and emulated compilation for Intel MIC. The only difference is which libcoi_host.so is used by liboffloadmic_host.so at run-time. Thanks, -- Ilya