[GNUnet-SVN] [gnurl] 177/256: configure: use -Wno-varargs on clang 3.9[.X] debug builds

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commit f8548e84adc4cc55c274beb23690b8a5f5b827bf
Author: Daniel Stenberg <address@hidden>
AuthorDate: Fri Sep 8 14:48:45 2017 +0200

    configure: use -Wno-varargs on clang 3.9[.X] debug builds
    
    ... to avoid a clang bug
---
 m4/curl-compilers.m4 | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index 7705e637f..422946e26 100644
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -5,7 +5,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2013, Daniel Stenberg, <address@hidden>, et al.
+# Copyright (C) 1998 - 2017, Daniel Stenberg, <address@hidden>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -922,6 +922,11 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
           dnl Only clang 3.9 or later
           if test "$compiler_num" -ge "309"; then
             tmp_CFLAGS="$tmp_CFLAGS -Wcomma"
+            # avoid the varargs warning, fixed in 4.0
+            # https://bugs.llvm.org/show_bug.cgi?id=29140
+            if test "$compiler_num" -lt "400"; then
+              tmp_CFLAGS="$tmp_CFLAGS -Wno-varargs"
+            fi
           fi
         fi
         ;;

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