X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/mLib/blobdiff_plain/3618811496a6d131fd4bffa19e262c521d39e819..refs/heads/master:/utils/macros.h

diff --git a/utils/macros.h b/utils/macros.h
index a5263e1..70f535f 100644
--- a/utils/macros.h
+++ b/utils/macros.h
@@ -51,7 +51,7 @@
 #define GLUE(x, y) MLIB__GLUE(x, y)
 
 #ifdef static_assert
-#  define STATIC_ASSERT(cond, msg) static_assert(cond, msg)
+#  define STATIC_ASSERT(cond, msg) static_assert(!!(cond), msg)
 #else
 #  define STATIC_ASSERT(cond, msg)					\
 	IGNORABLE extern char static_assert_failed[2*!!(cond) - 1]
@@ -94,6 +94,10 @@
 #  define IGNORABLE __attribute__((__unused__))
 #endif
 
+#if GCC_VERSION_P(3, 4) || CLANG_VERSION_P(3, 3)
+#  define MUST_CHECK __attribute__((__warn_unused_result__))
+#endif
+
 #if GCC_VERSION_P(4, 5) || CLANG_VERSION_P(3, 3)
 #  define DEPRECATED(msg) __attribute__((__deprecated__(msg)))
 #elif GCC_VERSION_P(3, 1)
@@ -223,6 +227,10 @@
 #  define IGNORABLE
 #endif
 
+#ifndef MUST_CHECK
+#  define MUST_CHECK
+#endif
+
 #ifndef GCC_WARNING
 #  define GCC_WARNING(warn)
 #endif