On Tue, Jun 09, 2020 at 11:12:25PM -0400, Arvind Sankar wrote: > On Wed, Jun 10, 2020 at 09:49:01AM +0800, Rong Chen wrote: > > > > > > On 6/10/20 8:58 AM, Fangrui Song wrote: > > > On 2020-06-10, Rong Chen wrote: > > >> > > >> > > >> On 6/10/20 1:49 AM, Fangrui Song wrote: > > >>> On 2020-06-09, Nick Desaulniers wrote: > > >>>> On Tue, Jun 9, 2020 at 6:12 AM kernel test robot <l...@intel.com> > > >>>> wrote: > > >>>>> > > >>>>> tree: > > >>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > > >>>>> master > > >>>>> head: abfbb29297c27e3f101f348dc9e467b0fe70f919 > > >>>>> commit: 10e68b02c861ccf2b3adb59d3f0c10dc6b5e3ace Makefile: support > > >>>>> compressed debug info > > >>>>> date: 12 days ago > > >>>>> config: x86_64-randconfig-r032-20200609 (attached as .config) > > >>>>> compiler: gcc-5 (Ubuntu 5.5.0-12ubuntu1) 5.5.0 20171010 > > >>>>> reproduce (this is a W=1 build): > > >>>>> git checkout 10e68b02c861ccf2b3adb59d3f0c10dc6b5e3ace > > >>>>> # save the attached .config to linux build tree > > >>>>> make W=1 ARCH=x86_64 > > >>>>> > > >>>>> If you fix the issue, kindly add following tag as appropriate > > >>>>> Reported-by: kernel test robot <l...@intel.com> > > >>>>> > > >>>>> All errors (new ones prefixed by >>, old ones prefixed by <<): > > >>>>> > > >>>>>>> gcc-5: error: -gz is not supported in this configuration > > >>>> > > >>>> Hmm...I wonder if the feature detection is incomplete? I suspect it's > > >>>> possible to not depend on zlib. > > >>>> > > >>>>> make[2]: *** [scripts/Makefile.build:277: scripts/mod/empty.o] > > >>>>> Error 1 > > >>>>> make[2]: Target '__build' not remade because of errors. > > >>>>> make[1]: *** [Makefile:1169: prepare0] Error 2 > > >>>>> make[1]: Target 'prepare' not remade because of errors. > > >>>>> make: *** [Makefile:185: __sub-make] Error 2 > > >>> > > >>> The output of gcc-5 -v --version on that machine may help. The > > >>> convoluted gcc_cv_ld_compress_de logic in gcc/configure.ac may be > > >>> related, but I can't find any mistake that our > > >>> CONFIG_DEBUG_INFO_COMPRESSED conditions may make. > > >> > > The output of gcc-5 -dumpspecs may also be useful. > > The exact Kconfig check should have been > gcc-5 -Werror -gz=zlib -S -x c /dev/null -o /dev/null > > I can't see how that would succeed if the a.c test didn't but maybe just > in case?
Oh wait, -S instead of -c. Which means it runs neither the assembler nor the linker, so gcc won't error out. But if that gcc was originally _configured_ with a version of binutils that doesn't support -gz=zlib, it will give an error on -c regardless of whether the runtime binutils would actually support it or not.
