[PAC] Use __has_feature macro instead of custom ones

Author: kovdan01

arch/aarch64/reloc.h

@@ -23,7 +23,7 @@
 #define CRTJMP(pc,sp) __asm__ __volatile__( \
 	"mov sp,%1 ; br %0" : : "r"(pc), "r"(sp) : "memory" )
 
-#ifdef MUSL_EXPERIMENTAL_PAC
+#if __has_feature(ptrauth_calls)
 #define TARGET_RELOCATE(dso, type, reladdr, sym, addend, is_phase_2) \
   do_target_reloc(dso, type, reladdr, sym, addend, is_phase_2)
 #define DO_TARGET_RELR(dso, dyn) do_pauth_relr(dso, dyn)

ldso/dynlink.c

@@ -19,7 +19,7 @@
 #include <dlfcn.h>
 #include <semaphore.h>
 #include <sys/membarrier.h>
-#ifdef MUSL_EXPERIMENTAL_PAC_INIT_FINI
+#if __has_feature(ptrauth_init_fini)
 #include <ptrauth.h>
 #endif
 #include "pthread_impl.h"
@@ -1536,7 +1536,7 @@ void __libc_exit_fini()
 		if (dyn[0] & (1<<DT_FINI_ARRAY)) {
 			size_t n = dyn[DT_FINI_ARRAYSZ]/sizeof(size_t);
 			size_t *fn = (size_t *)laddr(p, dyn[DT_FINI_ARRAY])+n;
-#ifdef MUSL_EXPERIMENTAL_PAC_INIT_FINI
+#if __has_feature(ptrauth_init_fini)
 			while (n--) {
 				ptrauth_auth_function(
 					(void (*)(void))*--fn,
@@ -1663,7 +1663,7 @@ static void do_init_fini(struct dso **queue)
 		if (dyn[0] & (1<<DT_INIT_ARRAY)) {
 			size_t n = dyn[DT_INIT_ARRAYSZ]/sizeof(size_t);
 			size_t *fn = laddr(p, dyn[DT_INIT_ARRAY]);
-#ifdef MUSL_EXPERIMENTAL_PAC_INIT_FINI
+#if __has_feature(ptrauth_init_fini)
 			while (n--) {
 				ptrauth_auth_function(
 					(void (*)(void))*fn++,

src/ldso/aarch64/reloc.c

@@ -1,4 +1,4 @@
-#ifdef MUSL_EXPERIMENTAL_PAC
+#if __has_feature(ptrauth_calls)
 
 #include <stdint.h>
 #include "reloc.h"

src/thread/aarch64/clone.s

@@ -25,7 +25,7 @@ __clone:
 	ret
 	// child
 1:	ldp x1,x0,[sp],#16
-#if MUSL_EXPERIMENTAL_PAC
+#if __has_feature(ptrauth_calls)
 	blraaz x1
 #else
 	blr x1