From: Razvan Becheriu <razvan@isc.org>
Date: Mon, 18 Oct 2021 16:17:31 +0000 (+0300)
Subject: [#2128] add check for [[noreturn]]
X-Git-Tag: Kea-2.1.0~62
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9669ec236f3a4153b3dd4e9a3b0366be50c05e9b;p=thirdparty%2Fkea.git

[#2128] add check for [[noreturn]]
---

diff --git a/m4macros/ax_cpp11.m4 b/m4macros/ax_cpp11.m4
index 99457f9491..e8985241fc 100644
--- a/m4macros/ax_cpp11.m4
+++ b/m4macros/ax_cpp11.m4
@@ -225,6 +225,26 @@ for retry in "none" "--std=c++11" "--std=c++0x" "--std=c++1x" "fail"; do
                 [AC_MSG_RESULT([no])
                  continue])
 
+        AC_MSG_CHECKING(noreturn support)
+        feature="noreturn"
+        CPPFLAGS_SAVED=${CPPFLAGS}
+        CPPFLAGS="-Werror $CPPFLAGS"
+        AC_COMPILE_IFELSE(
+                [AC_LANG_PROGRAM(
+                        [#include <cstdlib>
+                         [[[noreturn]]] void f() {exit(0);}],
+                        [int i = 0;
+                         switch (i) {
+                         case 0:
+                         f();
+                         default:
+                         break;
+                         }])],
+                [AC_MSG_RESULT([yes])],
+                [AC_MSG_RESULT([no])
+                 continue])
+         CPPFLAGS=$CPPFLAGS_SAVED
+
          AC_MSG_CHECKING(chrono support)
          feature="chrono"
          AC_COMPILE_IFELSE(