tal: allow notifiers on NULL.

[ccan] / ccan / compiler / compiler.h

diff --git a/ccan/compiler/compiler.h b/ccan/compiler/compiler.h
index 651b47cee9dcd611ad7c8513d92ec06ba852bb63..bce4f25a122612d7f26f8e846564747a01836b3b 100644 (file)
--- a/ccan/compiler/compiler.h
+++ b/ccan/compiler/compiler.h
@@ -17,7 +17,7 @@
  *     fprintf(stderr, "Error: %s (%s)\n", reason, strerror(errno));
  * }
  */
-#define COLD __attribute__((cold))
+#define COLD __attribute__((__cold__))
 #else
 #define COLD
 #endif
@@ -37,7 +37,7 @@
  *     exit(1);
  * }
  */
-#define NORETURN __attribute__((noreturn))
+#define NORETURN __attribute__((__noreturn__))
 #else
 #define NORETURN
 #endif
@@ -71,10 +71,24 @@
  * same value for the exact same arguments.  This implies that the function
  * must not use global variables, or dereference pointer arguments.
  */
-#define CONST_FUNCTION __attribute__((const))
+#define CONST_FUNCTION __attribute__((__const__))
 #else
 #define CONST_FUNCTION
 #endif
+
+#ifndef PURE_FUNCTION
+#if HAVE_ATTRIBUTE_PURE
+/**
+ * PURE_FUNCTION - a function is pure
+ *
+ * A pure function is one that has no side effects other than it's return value
+ * and uses no inputs other than it's arguments and global variables.
+ */
+#define PURE_FUNCTION __attribute__((__pure__))
+#else
+#define PURE_FUNCTION
+#endif
+#endif
 #endif
 
 #if HAVE_ATTRIBUTE_UNUSED
@@ -95,7 +109,7 @@
  *     counter += add;
  * }
  */
-#define UNNEEDED __attribute__((unused))
+#define UNNEEDED __attribute__((__unused__))
 #endif
 
 #ifndef NEEDED
@@ -114,10 +128,10 @@
  *             printf("Counter is %i\n", counter);
  *     }
  */
-#define NEEDED __attribute__((used))
+#define NEEDED __attribute__((__used__))
 #else
 /* Before used, unused functions and vars were always emitted. */
-#define NEEDED __attribute__((unused))
+#define NEEDED __attribute__((__unused__))
 #endif
 #endif
 
@@ -136,7 +150,7 @@
  *             return 0;
  *     }
  */
-#define UNUSED __attribute__((unused))
+#define UNUSED __attribute__((__unused__))
 #endif
 #else
 #ifndef UNNEEDED
@@ -209,7 +223,7 @@
  *     return realloc(buf, (*size) *= 2);
  * }
  */
-#define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
+#define WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
 #else
 #define WARN_UNUSED_RESULT
 #endif