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This patch implements target feature macros when PACBTI is enabled through the -march option or -mbranch-protection. The target feature macros __ARM_FEATURE_PAC_DEFAULT and __ARM_FEATURE_BTI_DEFAULT are specified in ARM ACLE <https://developer.arm.com/documentation/101028/0012/5--Feature-test-macros?lang=en> __ARM_FEATURE_PAUTH and __ARM_FEATURE_BTI are specified in the pull-request <https://github.com/ARM-software/acle/pull/55>. Approved here <https://gcc.gnu.org/pipermail/gcc-patches/2021-December/586334.html>. gcc/ * config/arm/arm-c.cc (arm_cpu_builtins): Define __ARM_FEATURE_BTI_DEFAULT, __ARM_FEATURE_PAC_DEFAULT, __ARM_FEATURE_PAUTH and __ARM_FEATURE_BTI. gcc/testsuite/ * lib/target-supports.exp (check_effective_target_mbranch_protection_ok): New function. * gcc.target/arm/acle/pacbti-m-predef-2.c: New test. * gcc.target/arm/acle/pacbti-m-predef-4.c: Likewise. * gcc.target/arm/acle/pacbti-m-predef-5.c: Likewise. * gcc.target/arm/acle/pacbti-m-predef-8.c: Likewise. * gcc.target/arm/acle/pacbti-m-predef-9.c: Likewise. * gcc.target/arm/acle/pacbti-m-predef-10.c: Likewise. * gcc.target/arm/acle/pacbti-m-predef-11.c: Likewise. * gcc.target/arm/acle/pacbti-m-predef-12.c: Likewise. Co-Authored-By: Tejas Belagod <tbelagod@arm.com>
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