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[Bug #20085] Use consistent default options for `-mbranch-protection`
We need to use the same options for both C compiler and assembler when `-mbranch-protection` is guessed by configure. Otherwise, `coroutine/arm64/Context.{h,S}` will use incompatible PAC strategies.
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@ -830,7 +830,10 @@ AS_IF([test "$GCC" = yes], [
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AS_FOR(option, opt, [-mbranch-protection=pac-ret -msign-return-address=all], [
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RUBY_TRY_CFLAGS(option, [branch_protection=yes], [branch_protection=no])
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AS_IF([test "x$branch_protection" = xyes], [
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# C compiler and assembler must be consistent for -mbranch-protection
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# since they both check `__ARM_FEATURE_PAC_DEFAULT` definition.
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RUBY_APPEND_OPTION(XCFLAGS, option)
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RUBY_APPEND_OPTION(ASFLAGS, option)
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break
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])
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])
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