From 264e8efad74ea3418b20e603271cbd66f0a2034d Mon Sep 17 00:00:00 2001
From: usertam <code@usertam.dev>
Date: Sun, 1 Jun 2025 22:50:46 +0800
Subject: [PATCH] Makefile.OSX: compile a fat library of both arm64e and arm64

---
 src/Makefile.OSX | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/Makefile.OSX b/src/Makefile.OSX
index 4743437..9bdf922 100644
--- a/src/Makefile.OSX
+++ b/src/Makefile.OSX
@@ -58,6 +58,18 @@ PREFIX ?= /usr/local
 CFLAGS += -DFAKE_SLEEP -DFAKE_INTERNAL_CALLS -DPREFIX='"'${PREFIX}'"' $(FAKETIME_COMPILE_CFLAGS) -DMACOS_DYLD_INTERPOSE -DFAKE_SETTIME
 LIB_LDFLAGS += -dynamiclib -current_version 0.9.11 -compatibility_version 0.7
 
+# From macOS 13 onwards, system binaries are compiled against the new arm64e ABI on Apple Silicon.
+# These arm64e binaries enforce Pointer Authentication Code (PAC), and will refuse to run with
+# "unprotected" arm64 libraries. Meanwhile, older platforms might not recognize the new arm64e ABI.
+
+# Therefore, we now compile for two ABIs at the same time, producing a fat library of arm64e and arm64,
+# so in the end the OS gets to pick which architecture it wants at runtime.
+ARCH := $(shell uname -m)
+
+ifeq ($(ARCH),arm64)
+    CFLAGS += -arch arm64e -arch arm64
+endif
+
 SONAME = 1
 LIBS = libfaketime.${SONAME}.dylib
 BINS = faketime