* configure.in: Check whether gas supports -relax. * configure, config.in: Rebuilt. * config/sparc/sparc.h (ASM_RELAX_SPEC): Define. (EXTRA_SPECS): Add asm_relax. (ASM_SPEC): Add %(asm_relax). (TARGET_SWITCHES): Add -mrelax and -mno-relax. * config/sparc/linux64.h (LINK_ARCH_SPEC): Rename to LINK_SPEC. (LINK_SPEC): Pass -relax to linker unless -mno-relax or -r. (ASM_SPEC): Add %(asm_relax). * config/sparc/linux.h (LINK_SPEC, ASM_SPEC): Likewise. * config/sparc/sparc.c (output_sibcall): If HAVE_AS_RELAX_OPTION, never use sethi/jmpl for leaf tail calls. Use or with rs2 %g0 instead of mov, so that gas can further optimize it. From-SVN: r34466
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