2 files changed, 2 insertions, 2 deletions
diff --git a/coro.c b/coro.c
index 7e69ab0..194cd46 100644
--- a/coro.c
+++ b/coro.c
@@ -88,8 +88,7 @@ coro_init (void)
 
   coro_transfer (new_coro, create_coro);
 
-#if __linux && __amd64
-  /* we blindly assume on any __linux with __amd64 we have a new enough gas with .cfi_undefined support */
+#if __GCC_HAVE_DWARF2_CFI_ASM && __amd64
   asm (".cfi_undefined rip");
 #endif
 
diff --git a/coro.h b/coro.h
index c5602bb..067a6d4 100644
--- a/coro.h
+++ b/coro.h
@@ -73,6 +73,7 @@
  * 2011-05-30 set initial callee-saved-registers to zero with CORO_ASM.
  *            use .cfi_undefined rip on linux-amd64 for better backtraces.
  * 2011-06-08 maybe properly implement weird windows amd64 calling conventions.
+ * 2011-07-03 rely on __GCC_HAVE_DWARF2_CFI_ASM for cfi detection.
  */
 
 #ifndef CORO_H