X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/b3626b4c729ddb81b43ef58bee5d324b94f8908a..HEAD:/funcattrs.h

diff --git a/funcattrs.h b/funcattrs.h
index 129492e5..28e4108b 100644
--- a/funcattrs.h
+++ b/funcattrs.h
@@ -42,24 +42,6 @@
  * compiler-specific extensions.
  */
 
-/*
- * This was introduced by Clang:
- *
- *     https://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
- *
- * in some version (which version?); it has been picked up by GCC 5.0.
- */
-#ifndef __has_attribute
-  /*
-   * It's a macro, so you can check whether it's defined to check
-   * whether it's supported.
-   *
-   * If it's not, define it to always return 0, so that we move on to
-   * the fallback checks.
-   */
-  #define __has_attribute(x) 0
-#endif
-
 /*
  * NORETURN, before a function declaration, means "this function
  * never returns".  (It must go before the function declaration, e.g.
@@ -70,12 +52,14 @@
     || ND_IS_AT_LEAST_GNUC_VERSION(2,5) \
     || ND_IS_AT_LEAST_SUNC_VERSION(5,9) \
     || ND_IS_AT_LEAST_XL_C_VERSION(10,1) \
-    || ND_IS_AT_LEAST_HP_C_VERSION(6,10)
+    || ND_IS_AT_LEAST_HP_C_VERSION(6,10) \
+    || __TINYC__
   /*
    * 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, or current TinyCC.
    */
   #define NORETURN __attribute((noreturn))
 
@@ -104,6 +88,19 @@
   #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