diff --git a/src/runtime/cgo/gcc_386.S b/src/runtime/cgo/gcc_386.S
index 5e6d715ce2f..5bd677f4d68 100644
--- a/src/runtime/cgo/gcc_386.S
+++ b/src/runtime/cgo/gcc_386.S
@@ -5,9 +5,9 @@
 .file "gcc_386.S"
 
 /*
- * Apple still insists on underscore prefixes for C function names.
+ * Windows still insists on underscore prefixes for C function names.
  */
-#if defined(__APPLE__) || defined(_WIN32)
+#if defined(_WIN32)
 #define EXT(s) _##s
 #else
 #define EXT(s) s
diff --git a/src/runtime/cgo/gcc_arm.S b/src/runtime/cgo/gcc_arm.S
index 6e8c14a28d8..474fc23a39b 100644
--- a/src/runtime/cgo/gcc_arm.S
+++ b/src/runtime/cgo/gcc_arm.S
@@ -4,19 +4,6 @@
 
 .file "gcc_arm.S"
 
-/*
- * Apple still insists on underscore prefixes for C function names.
- */
-#if defined(__APPLE__)
-#define EXT(s) _##s
-#else
-#define EXT(s) s
-#endif
-
-// Apple's ld64 wants 4-byte alignment for ARM code sections.
-// .align in both Apple as and GNU as treat n as aligning to 2**n bytes.
-.align	2
-
 /*
  * void crosscall_arm1(void (*fn)(void), void (*setg_gcc)(void *g), void *g)
  *
@@ -24,8 +11,8 @@
  * Called from standard ARM EABI, where r4-r11 are callee-save, so they
  * must be saved explicitly.
  */
-.globl EXT(crosscall_arm1)
-EXT(crosscall_arm1):
+.globl crosscall_arm1
+crosscall_arm1:
 	push {r4, r5, r6, r7, r8, r9, r10, r11, ip, lr}
 	mov r4, r0
 	mov r5, r1
diff --git a/src/runtime/cgo/gcc_linux_ppc64x.S b/src/runtime/cgo/gcc_linux_ppc64x.S
index 5c8b3e70bb0..e67deaacf25 100644
--- a/src/runtime/cgo/gcc_linux_ppc64x.S
+++ b/src/runtime/cgo/gcc_linux_ppc64x.S
@@ -6,15 +6,6 @@
 
 .file "gcc_linux_ppc64x.S"
 
-/*
- * Apple still insists on underscore prefixes for C function names.
- */
-#if defined(__APPLE__)
-#define EXT(s) _##s
-#else
-#define EXT(s) s
-#endif
-
 /*
  * void crosscall_ppc64(void (*fn)(void), void *g)
  *
@@ -22,8 +13,8 @@
  * Called from standard ppc64 C ABI, where r2, r14-r31, f14-f31 are
  * callee-save, so they must be saved explicitly.
  */
-.globl EXT(crosscall_ppc64)
-EXT(crosscall_ppc64):
+.globl crosscall_ppc64
+crosscall_ppc64:
 	// Start with standard C stack frame layout and linkage
 	mflr	%r0
 	std	%r0, 16(%r1)	// Save LR in caller's frame