https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91050
--- Comment #14 from Alan Modra <amodra at gcc dot gnu.org> --- Author: amodra Date: Sun Jul 28 09:26:13 2019 New Revision: 273853 URL: https://gcc.gnu.org/viewcvs?rev=273853&root=gcc&view=rev Log: [RS6000] Make assembler command line cpu match default for gcc When gcc is configured using --with-cpu=<cpu>, the specified cpu effectively becomes a default -mcpu=<cpu> passed to gcc. This then affects the cpu passed to gas via ASM_CPU_SPEC. If gcc is not configured using --with-cpu then the cpu passed to gas is that given by ASM_DEFAULT_SPEC, which currently does not match the default flags selected in default64.h. This patch makes ASM_DEFAULT_SPEC agree with TARGET_DEFAULT flags. rs6000/default64.h appears in three places in config.gcc, the first one immediately followed by rs6000/freebsd64.h in $tm_file, and the other two immediately followed by rs6000/linux64.h. To be able to define ASM_DEFAULT_SPEC in rs6000/default64.h we don't want to redefine in the other two files. rs6000/freebsd64.h is easy since that file is always preceded by rs6000/default64.h, but rs6000/linux64.h can appear without rs6000/default64.h (a powerpc*-linux config where the default is -m32). In that case we will have TARGET_DEFAULT flags of 0 (from rs6000/sysv4.h) and want to use -mppc without -m64 and -mppc64 with -m64. This can be done by using the rs6000/rtems.h ASM_DEFAULT_SPEC in rs6000/sysv4.h, a change that won't affect sysv4 configurations where -m64 is invalid. The patch also introduces ASM_DEFAULT_EXTRA for the altivec variant targets so as to enable -maltivec by default. PR target/91050 * config/rs6000/sysv4.h (ASM_DEFAULT_SPEC): Modify if -m64. * config/rs6000/default64.h (ASM_DEFAULT_SPEC): Define. * config/rs6000/freebsd64.h (ASM_DEFAULT_SPEC): Don't define. * config/rs6000/linux64.h (ASM_DEFAULT_SPEC): Likewise. * config/rs6000/rtems.h (ASM_DEFAULT_SPEC): Likewise. * config/rs6000/rs6000.h (ASM_DEFAULT_EXTRA): Define and use in asm_default spec. * config/rs6000/eabialtivec.h (ASM_DEFAULT_EXTRA): Redefine. * config/rs6000/linuxaltivec.h (ASM_DEFAULT_EXTRA): Redefine. Modified: trunk/gcc/ChangeLog trunk/gcc/config/rs6000/default64.h trunk/gcc/config/rs6000/eabialtivec.h trunk/gcc/config/rs6000/freebsd64.h trunk/gcc/config/rs6000/linux64.h trunk/gcc/config/rs6000/linuxaltivec.h trunk/gcc/config/rs6000/rs6000.h trunk/gcc/config/rs6000/rtems.h trunk/gcc/config/rs6000/sysv4.h
