From: Rusty Russell <rusty@rustcorp.com.au>
Date: Tue, 4 Jan 2011 10:42:41 +0000 (+1030)
Subject: compiler: NORETURN
X-Git-Url: https://git.ozlabs.org/?p=ccan;a=commitdiff_plain;h=6e1cdb3d8b6fac56b24403e2d0b86810a9ccffb2

compiler: NORETURN
---

diff --git a/ccan/compiler/compiler.h b/ccan/compiler/compiler.h
index d57d814b..1e0d8efb 100644
--- a/ccan/compiler/compiler.h
+++ b/ccan/compiler/compiler.h
@@ -20,6 +20,24 @@
 #define COLD
 #endif
 
+#if HAVE_ATTRIBUTE_NORETURN
+/**
+ * NORETURN - a function does not return
+ *
+ * Used to mark a function which exits; useful for suppressing warnings.
+ *
+ * Example:
+ * static void NORETURN fail(const char *reason)
+ * {
+ *	fprintf(stderr, "Error: %s (%s)\n", reason, strerror(errno));
+ *	exit(1);
+ * }
+ */
+#define NORETURN __attribute__((noreturn))
+#else
+#define NORETURN
+#endif
+
 #if HAVE_ATTRIBUTE_PRINTF
 /**
  * PRINTF_FMT - a function takes printf-style arguments
diff --git a/config.h b/config.h
index 7ef5d3ba..0473fb1f 100644
--- a/config.h
+++ b/config.h
@@ -6,6 +6,7 @@
 #define HAVE_ATTRIBUTE_COLD 1
 #define HAVE_ATTRIBUTE_CONST 1
 #define HAVE_ATTRIBUTE_MAY_ALIAS 1
+#define HAVE_ATTRIBUTE_NORETURN 1
 #define HAVE_ATTRIBUTE_PRINTF 1
 #define HAVE_ATTRIBUTE_UNUSED 1
 #define HAVE_ATTRIBUTE_USED 1
diff --git a/tools/configurator/configurator.c b/tools/configurator/configurator.c
index 4445139c..7d9db8a1 100644
--- a/tools/configurator/configurator.c
+++ b/tools/configurator/configurator.c
@@ -44,6 +44,9 @@ static struct test tests[] = {
 	  "static int __attribute__((const)) func(int x) { return x; }" },
 	{ "HAVE_ATTRIBUTE_MAY_ALIAS", OUTSIDE_MAIN, NULL,
 	  "typedef short __attribute__((__may_alias__)) short_a;" },
+	{ "HAVE_ATTRIBUTE_NORETURN", DEFINES_FUNC, NULL,
+	  "#include <stdlib.h>\n"
+	  "static void __attribute__((noreturn)) func(int x) { exit(x); }" },
 	{ "HAVE_ATTRIBUTE_PRINTF", DEFINES_FUNC, NULL,
 	  "static void __attribute__((format(__printf__, 1, 2))) func(const char *fmt, ...) { }" },
 	{ "HAVE_ATTRIBUTE_UNUSED", OUTSIDE_MAIN, NULL,