From 57fa576a35e45a729939d5ef6bced81f3facbf63 Mon Sep 17 00:00:00 2001
From: Yang Tse <yangsita@gmail.com>
Date: Sun, 16 Dec 2012 18:51:51 +0100
Subject: configure: check if compiler halts on function prototype mismatch

---
 m4/curl-compilers.m4 | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

(limited to 'm4/curl-compilers.m4')

diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index 819bbd9c8..0879a48e0 100644
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -21,7 +21,7 @@
 #***************************************************************************
 
 # File version for 'aclocal' use. Keep it a single number.
-# serial 63
+# serial 64
 
 
 dnl CURL_CHECK_COMPILER
@@ -1495,6 +1495,42 @@ AC_DEFUN([CURL_CHECK_COMPILER_SYMBOL_HIDING], [
 ])
 
 
+dnl CURL_CHECK_COMPILER_PROTOTYPE_MISMATCH
+dnl -------------------------------------------------
+dnl Verifies if the compiler actually halts after the
+dnl compilation phase without generating any object
+dnl code file, when the source code tries to redefine
+dnl a prototype which does not match previous one.
+
+AC_DEFUN([CURL_CHECK_COMPILER_PROTOTYPE_MISMATCH], [
+  AC_REQUIRE([CURL_CHECK_COMPILER_HALT_ON_ERROR])dnl
+  AC_MSG_CHECKING([if compiler halts on function prototype mismatch])
+  AC_COMPILE_IFELSE([
+    AC_LANG_PROGRAM([[
+#     include <stdlib.h>
+      int rand(int n);
+      int rand(int n)
+      {
+        if(n)
+          return ++n;
+        else
+          return n;
+      }
+    ]],[[
+      int i[2];
+      int j = rand(i[0]);
+      if(j)
+        return j;
+    ]])
+  ],[
+    AC_MSG_RESULT([no])
+    AC_MSG_ERROR([compiler does not halt on function prototype mismatch.])
+  ],[
+    AC_MSG_RESULT([yes])
+  ])
+])
+
+
 dnl CURL_VAR_MATCH (VARNAME, VALUE)
 dnl -------------------------------------------------
 dnl Verifies if shell variable VARNAME contains VALUE.
-- 
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