# HG changeset patch
# User Mike Miller <mtmiller@octave.org>
# Date 1456274884 28800
# Node ID fd4ff31b3eedc8b05b19f1d20557900bde5c0c1a
# Parent  9a49c83cb360b72a81e422fb522ab6bc93dd3e6c
build: Fix C++11 compliance detection to work with clang

* prog_cxx.m4 (OCTAVE_CXX_CXX11_TEST_BODY): Const-qualify Unicode string
initializations to work with stricter compilers (e.g. clang).

diff -r 9a49c83cb360 -r fd4ff31b3eed m4/prog_cxx.m4
--- a/m4/prog_cxx.m4	Tue Feb 23 16:34:23 2016 -0800
+++ b/m4/prog_cxx.m4	Tue Feb 23 16:48:04 2016 -0800
@@ -318,9 +318,12 @@
   std::vector<std::pair<int,char*>> v1;
 }
 {
+dnl FIXME: Octave-specific change, this feature test is modified from the
+dnl original Autoconf source. The "const" type qualifier is strictly required,
+dnl needed for this test to pass with clang for example.
   // Unicode literals
-  char *utf8 = u8"UTF-8 string \u2500";
-  char16_t *utf16 = u"UTF-8 string \u2500";
-  char32_t *utf32 = U"UTF-32 string \u2500";
+  const char *utf8 = u8"UTF-8 string \u2500";
+  const char16_t *utf16 = u"UTF-8 string \u2500";
+  const char32_t *utf32 = U"UTF-32 string \u2500";
 }
 ]])