Srikar Dronamraju <sri...@linux.vnet.ibm.com> writes: > * Michael Ellerman <patch-notificati...@ellerman.id.au> [2020-09-17 21:28:46]: > >> On Tue, 8 Sep 2020 22:58:50 +1000, Michael Ellerman wrote: >> > When we added the VDSO32 kconfig symbol, which controls building of >> > the 32-bit VDSO, we made it depend on CPU_BIG_ENDIAN (for 64-bit). >> > >> > That was because back then COMPAT was always enabled for 64-bit, so >> > depending on it would have left the 32-bit VDSO always enabled, which >> > we didn't want. >> > >> > [...] >> >> Applied to powerpc/next. >> >> [1/1] powerpc/64: Make VDSO32 track COMPAT on 64-bit >> >> https://git.kernel.org/powerpc/c/231b232df8f67e7d37af01259c21f2a131c3911e >> >> cheers > > With this commit which is part of powerpc/next and with > /opt/at12.0/bin/gcc --version > gcc (GCC) 8.4.1 20191125 (Advance-Toolchain 12.0-3) [e25f27eea473] > throws up a compile error on a witherspoon/PowerNV with CONFIG_COMPAT. > CONFIG_COMPAT got carried from the distro config. (And looks like most > distros seem to be having this config)
This distro config will have it because previously it couldn't be disabled. But now that it's selectable all LE distros should disable it. > cc1: error: _-m32_ not supported in this configuration > make[4]: *** [arch/powerpc/kernel/vdso32/sigtramp.o] Error 1 > make[4]: *** Waiting for unfinished jobs.... > cc1: error: _-m32_ not supported in this configuration > make[4]: *** [arch/powerpc/kernel/vdso32/gettimeofday.o] Error 1 > make[3]: *** [arch/powerpc/kernel/vdso32] Error 2 > make[3]: *** Waiting for unfinished jobs.... > make[2]: *** [arch/powerpc/kernel] Error 2 > make[2]: *** Waiting for unfinished jobs.... > make[1]: *** [arch/powerpc] Error 2 > make[1]: *** Waiting for unfinished jobs.... > make: *** [__sub-make] Error 2 > > I don't seem to be facing with other compilers like "gcc (Ubuntu > 7.4.0-1ubuntu1~18.04.1) 7.4.0" and I was able to disable CONFIG_COMPAT and > proceed with the build. It seems your compiler doesn't support building 32-bit binaries. I'm pretty sure the kernel.org ones do, or you can just turn off COMPAT. cheers
