libmetal/atomic: enable 64-bit atomic by toolchain builtin flags

Fix compile error: arm-none-eabi-ld: (remoteproc_virtio.o): in function `metal_io_read': metal/io.h:252: undefined reference to `__atomic_load_8' arm-none-eabi-ld: (remoteproc_virtio.o): in function `metal_io_write': metal/io.h:290: undefined reference to `__atomic_store_8' Not all 32-bit architectures support 64bit atomic, gcc/clang toolchains have built-in properties to indicate whether support atomic64: | $ arm-none-eabi-gcc -march=armv7e-m -dM -E - < /dev/null | grep SYNC | #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1 | #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1 | #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1 Signed-off-by: chao an <[email protected]>
OpenAMP · Jun 29, 2024 · 105f878 · 105f878
1 parent 3aee6be
commit 105f878
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/lib/io.h b/lib/io.h
@@ -30,8 +30,9 @@ extern "C" {
  *  @{
  */
 
-#ifdef __MICROBLAZE__
-#define NO_ATOMIC_64_SUPPORT
+#if defined(__MICROBLAZE__) || \
+   (defined(__GNUC__) && !defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8))
+#  define NO_ATOMIC_64_SUPPORT
 #endif
 
 struct metal_io_region;