darwin-amd64.txt

# macOS + Intel only — appended after base.txt and darwin.txt.

# Target ISA baseline: x86-64-v3, matching the linux-amd64 floor. The last
# Intel Mac models (2019-2020 iMac Pro / Mac Pro / 16" MBP) all expose at
# least Skylake-X-class ISA, so this is a safe deployment baseline.
# Apple-Silicon Macs do not consume this file (they take darwin-arm64).
#
# Conservative extension layer relative to linux-amd64: Intel Macs cap
# at Coffee Lake / Comet Lake / Cascade Lake (Mac Pro 2019), none of
# which have SHA-NI, VAES, or GFNI. AES-NI, PCLMUL, and RDRAND have
# been shipping since well before the x86-64-v3 floor (Westmere /
# Ivy Bridge respectively), so they're free additions on every Intel
# Mac that actually meets the Haswell-class baseline.
-march=x86-64-v3
-maes
-mpclmul
-mrdrnd

# Intentionally NOT enabling -fcf-protection here: macOS userspace doesn't
# wire up Intel CET (no IBT/SHSTK runtime, no equivalent of arch_prctl).
# Emitting the ENDBR64 prologues would just bloat code with no enforcement,
# and the GNU-property notes the flag generates aren't honored by dyld.