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authorMax Kellermann <max@duempel.org>2012-07-30 07:26:19 +0200
committerMax Kellermann <max@duempel.org>2012-08-01 09:59:12 +0200
commit2571accfc3bd98b4f8d0795b334e01bea640f0d4 (patch)
treeb1a216d3cc99ea61f99421fa2a15ac92f18f4f5a /m4
parent0d2abdb5d97c0f2b6d0b76356e9ce12603bd7ac2 (diff)
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configure.ac: require C++11 compiler
We'll add some C++11 code soon.
Diffstat (limited to 'm4')
-rw-r--r--m4/ax_cxx_compile_stdcxx_0x.m4107
1 files changed, 107 insertions, 0 deletions
diff --git a/m4/ax_cxx_compile_stdcxx_0x.m4 b/m4/ax_cxx_compile_stdcxx_0x.m4
new file mode 100644
index 000000000..a4e556ff9
--- /dev/null
+++ b/m4/ax_cxx_compile_stdcxx_0x.m4
@@ -0,0 +1,107 @@
+# ============================================================================
+# http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_0x.html
+# ============================================================================
+#
+# SYNOPSIS
+#
+# AX_CXX_COMPILE_STDCXX_0X
+#
+# DESCRIPTION
+#
+# Check for baseline language coverage in the compiler for the C++0x
+# standard.
+#
+# LICENSE
+#
+# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 7
+
+AU_ALIAS([AC_CXX_COMPILE_STDCXX_0X], [AX_CXX_COMPILE_STDCXX_0X])
+AC_DEFUN([AX_CXX_COMPILE_STDCXX_0X], [
+ AC_CACHE_CHECK(if g++ supports C++0x features without additional flags,
+ ax_cv_cxx_compile_cxx0x_native,
+ [AC_LANG_SAVE
+ AC_LANG_CPLUSPLUS
+ AC_TRY_COMPILE([
+ template <typename T>
+ struct check
+ {
+ static_assert(sizeof(int) <= sizeof(T), "not big enough");
+ };
+
+ typedef check<check<bool>> right_angle_brackets;
+
+ int a;
+ decltype(a) b;
+
+ typedef check<int> check_type;
+ check_type c;
+ check_type&& cr = static_cast<check_type&&>(c);],,
+ ax_cv_cxx_compile_cxx0x_native=yes, ax_cv_cxx_compile_cxx0x_native=no)
+ AC_LANG_RESTORE
+ ])
+
+ AC_CACHE_CHECK(if g++ supports C++0x features with -std=c++0x,
+ ax_cv_cxx_compile_cxx0x_cxx,
+ [AC_LANG_SAVE
+ AC_LANG_CPLUSPLUS
+ ac_save_CXXFLAGS="$CXXFLAGS"
+ CXXFLAGS="$CXXFLAGS -std=c++0x"
+ AC_TRY_COMPILE([
+ template <typename T>
+ struct check
+ {
+ static_assert(sizeof(int) <= sizeof(T), "not big enough");
+ };
+
+ typedef check<check<bool>> right_angle_brackets;
+
+ int a;
+ decltype(a) b;
+
+ typedef check<int> check_type;
+ check_type c;
+ check_type&& cr = static_cast<check_type&&>(c);],,
+ ax_cv_cxx_compile_cxx0x_cxx=yes, ax_cv_cxx_compile_cxx0x_cxx=no)
+ CXXFLAGS="$ac_save_CXXFLAGS"
+ AC_LANG_RESTORE
+ ])
+
+ AC_CACHE_CHECK(if g++ supports C++0x features with -std=gnu++0x,
+ ax_cv_cxx_compile_cxx0x_gxx,
+ [AC_LANG_SAVE
+ AC_LANG_CPLUSPLUS
+ ac_save_CXXFLAGS="$CXXFLAGS"
+ CXXFLAGS="$CXXFLAGS -std=gnu++0x"
+ AC_TRY_COMPILE([
+ template <typename T>
+ struct check
+ {
+ static_assert(sizeof(int) <= sizeof(T), "not big enough");
+ };
+
+ typedef check<check<bool>> right_angle_brackets;
+
+ int a;
+ decltype(a) b;
+
+ typedef check<int> check_type;
+ check_type c;
+ check_type&& cr = static_cast<check_type&&>(c);],,
+ ax_cv_cxx_compile_cxx0x_gxx=yes, ax_cv_cxx_compile_cxx0x_gxx=no)
+ CXXFLAGS="$ac_save_CXXFLAGS"
+ AC_LANG_RESTORE
+ ])
+
+ if test "$ax_cv_cxx_compile_cxx0x_native" = yes ||
+ test "$ax_cv_cxx_compile_cxx0x_cxx" = yes ||
+ test "$ax_cv_cxx_compile_cxx0x_gxx" = yes; then
+ AC_DEFINE(HAVE_STDCXX_0X,,[Define if g++ supports C++0x features. ])
+ fi
+])