X-Git-Url: https://git.distorted.org.uk/~mdw/mLib/blobdiff_plain/e6591bec0938b76b8c02083eb6ba101aba4e1b7e..b64eb60f6c1fdb12f3922e04913e137199838807:/utils/macros.h

diff --git a/utils/macros.h b/utils/macros.h
index 73230bd..954ed0c 100644
--- a/utils/macros.h
+++ b/utils/macros.h
@@ -110,6 +110,12 @@
 #  define EXECL_LIKE(ntrail) __attribute__((__sentinel__(ntrail)))
 #endif
 
+#if GCC_VERSION_P(2, 7)
+#  define LAUNDER(x)							\
+	({ __typeof__(x) _y; __asm__("" : "=g"(_y) : "0"(x)); _y; })
+#  define RELAX do __asm__ __volatile__("" ::: "memory"); while (0)
+#endif
+
 #if CLANG_VERSION_P(3, 3)
 
 #  define MLIB__PRAGMA_HACK(x) _Pragma(#x)
@@ -233,6 +239,14 @@
 #  define MUST_CHECK
 #endif
 
+#ifndef LAUNDER
+#  define LAUNDER
+#endif
+
+#ifndef RELAX
+#  define RELAX
+#endif
+
 #ifndef GCC_WARNING
 #  define GCC_WARNING(warn)
 #endif