0b4a769ec9
Testing an x86_64 toolchain configured for a processor with TARGET_SOFTWARE_PREFETCHING_BENEFICIAL produces failures FAIL: g++.dg/pr60518.C -std=gnu++98 (test for excess errors) FAIL: g++.dg/pr60518.C -std=gnu++11 (test for excess errors) FAIL: g++.dg/pr60518.C -std=gnu++14 (test for excess errors) where the failure is from the message "pr60518.C:1:0: warning: -fprefetch-loop-arrays is not supported with -Os". Given that lack of support, it seems appropriate for the back end not to enable this option in the -Os case; this patch implements that. Bootstrapped with no regressions on x86_64-unknown-linux-gnu; tested for a cross to x86_64-linux-gnu --with-arch=btver2, where those test failures duly disappear. * config/i386/i386.c (ix86_option_override_internal): Don't set -fprefetch-loop-arrays if optimizing for size. From-SVN: r222033
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