arm: warn about deprecation of iwmmx in mmintrin.h

GCC 13's changes file documents that iwmmx is deprecated.  Raise the bar
by warning when the mmintrin.h header is included by users, but provide
a way to suppress the warning.

gcc:
	* config/arm/mmintrin.h: Warn if this header is included without
	defining __ENABLE_DEPRECATED_IWMMXT.

diff --git a/gcc/config/arm/mmintrin.h b/gcc/config/arm/mmintrin.h
index 07659502bf2f9315a51b16daa9d46068b64394b4..e9cc3ddd7ab7e70bca7e5dc5601db11faa957cce 100644 (file)
--- a/gcc/config/arm/mmintrin.h
+++ b/gcc/config/arm/mmintrin.h
@@ -28,6 +28,9 @@
 #error mmintrin.h included without enabling WMMX/WMMX2 instructions (e.g. -march=iwmmxt or -march=iwmmxt2)
 #endif
 
+#ifndef __ENABLE_DEPRECATED_IWMMXT
+#warning support for WMMX/WMMX2 is deprecated and will be removed in GCC 15.  Define __ENABLE_DEPRECATED_IWMMXT to suppress this warning
+#endif
 
 #if defined __cplusplus
 extern "C" {