Bug #20154 ยป 0001-aarch64-Check-mbranch-protection-standard-first-to-u.patch
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# aarch64 branch protection
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AS_CASE(["$target_cpu"], [aarch64], [
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AS_FOR(option, opt, [-mbranch-protection=pac-ret -msign-return-address=all], [
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AS_FOR(option, opt, [-mbranch-protection=standard -mbranch-protection=pac-ret -msign-return-address=all], [
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RUBY_TRY_CFLAGS(option, [branch_protection=yes], [branch_protection=no])
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AS_IF([test "x$branch_protection" = xyes], [
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# C compiler and assembler must be consistent for -mbranch-protection
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