Makefile.in: don't remove configure and config.h.in in make distclean.

[tcpdump] / funcattrs.h

diff --git a/funcattrs.h b/funcattrs.h
index 17afdda25106e2292ff58112d37075d3711d1354..21f3cc1dafd0e83a5485e3b2e4f5edca048db368 100644 (file)
--- a/funcattrs.h
+++ b/funcattrs.h
@@ -55,9 +55,10 @@
     || ND_IS_AT_LEAST_HP_C_VERSION(6,10)
   /*
    * Compiler with support for __attribute((noreturn)), or GCC 2.5 and
+   * later, or some compiler asserting compatibility with GCC 2.5 and
    * later, or Solaris Studio 12 (Sun C 5.9) and later, or IBM XL C 10.1
-   * and later (do any earlier versions of XL C support this?), or
-   * HP aCC A.06.10 and later.
+   * and later (do any earlier versions of XL C support this?), or HP aCC
+   * A.06.10 and later.
    */
   #define NORETURN __attribute((noreturn))
 
@@ -86,6 +87,19 @@
   #define NORETURN_FUNCPTR
 #endif
 
+/*
+ * WARN_UNUSED_RESULT, before a function declaration, means "the caller
+ * should use the result of this function" (even if it's just a success/
+ * failure indication).
+ */
+#if __has_attribute(warn_unused_result) \
+    || ND_IS_AT_LEAST_GNUC_VERSION(3,4) \
+    || ND_IS_AT_LEAST_HP_C_VERSION(6,25)
+  #define WARN_UNUSED_RESULT __attribute((warn_unused_result))
+#else
+  #define WARN_UNUSED_RESULT
+#endif
+
 /*
  * PRINTFLIKE(x,y), after a function declaration, means "this function
  * does printf-style formatting, with the xth argument being the format