From 114e21eb1b9fbb738c0880aabf2629f991f5c8c6 Mon Sep 17 00:00:00 2001
From: Amos Jeffries <squid3@treenet.co.nz>
Date: Sat, 17 Dec 2016 19:37:44 +1300
Subject: [PATCH] Do not override user defined -std option

---
 configure.ac | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/configure.ac b/configure.ac
index b8232ee0de..6f6cf25a4c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -82,16 +82,16 @@ if test "x$squid_host_os" = "solaris" -a "x$GCC" != "x" ; then
 	AC_USE_SYSTEM_EXTENSIONS
 fi
 
+# If the user did not specify a C++ version.
+user_cxx=`echo "$PRESET_CXXFLAGS" | grep -o -E "\-std="`
+if test "x$user_cxx" = "x"; then
 # Check for C++11 compiler support
-if test "x$squid_host_os" != "xmingw" ; then
+  if ! test "x$squid_host_os" = "xmingw" -o "x$squid_host_os" = "xcygwin" -o "x$squid_cv_compiler" = "xclang"; then
     #BUG 3613: when clang -std=c++0x is used, it activates a "strict mode"
     # in the system libraries, which makes some c99 methods unavailable
     # (e.g. strtoll), yet configure detects them as avilable.
-    case "$CXX" in
-      *clang++*) ;; #do nothing
-      *)
-      AX_CXX_COMPILE_STDCXX_11([noext],[optional])
-    esac
+    AX_CXX_COMPILE_STDCXX_11([noext],[optional])
+  fi
 fi
 
 # test for programs
-- 
2.47.2