From: Jean-Marc Lasgouttes <lasgouttes@lyx.org>
Date: Tue, 19 May 2015 13:10:38 +0000 (+0200)
Subject: Use explicit macro to declare that we want to use C++11
X-Git-Tag: 2.2.0alpha1~725
X-Git-Url: https://git.lyx.org/gitweb/?a=commitdiff_plain;h=329eae56;p=features.git

Use explicit macro to declare that we want to use C++11

This replaces tests for __cplusplus >= 201103L, which are wrong with gcc 4.6 and earlier. Indeed these versions of gcc define __cplusplus = 1.

Reference:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=1773
---

diff --git a/config/lyxinclude.m4 b/config/lyxinclude.m4
index c9cb11d424..ba5344a342 100644
--- a/config/lyxinclude.m4
+++ b/config/lyxinclude.m4
@@ -159,6 +159,15 @@ AC_DEFUN([LYX_LIB_STDCXX],
 ])
 
 
+dnl Usage: LYX_CXX_USE_CXX11(STD): pass option -std=STD to the C++ compiler
+dnl        and define LYX_USE_CXX11.
+AC_DEFUN([LYX_CXX_USE_CXX11],
+[lyx_flags="$lyx_flags c++11-mode"
+ AM_CXXFLAGS="$AM_CXXFLAGS -std=$1"
+ AC_DEFINE([LYX_USE_CXX11], 1, [Define if LyX should use C++11 features])
+])
+
+
 dnl Usage: LYX_LIB_STDCXX_CXX11_ABI: set lyx_cv_lib_stdcxx_cxx11_abi to yes
 dnl        if the STL library is GNU libstdc++ and the C++11 ABI is used.
 AC_DEFUN([LYX_LIB_STDCXX_CXX11_ABI],
@@ -329,17 +338,13 @@ if test x$GXX = xyes; then
     case $gxx_version in
       4.0*|4.1*|4.2*) AC_ERROR([There is no C++11 support in gcc 4.2 or older]);;
       4.3*|4.4*|4.5*|4.6*)
-        lyx_flags="$lyx_flags c++11-mode"
-	AM_CXXFLAGS="$AM_CXXFLAGS -std=gnu++0x";;
+        LYX_CXX_USE_CXX11(gnu++0x);;
       clang)
         dnl presumably all clang version support c++11.
-        lyx_flags="$lyx_flags c++11-mode"
 	dnl the deprecated-register warning is very annoying with Qt4.x right now.
-        AM_CXXFLAGS="$AM_CXXFLAGS -std=c++11 -Wno-deprecated-register";;
+        LYX_CXX_USE_CXX11(c++11 -Wno-deprecated-register);;
       *)
-	lyx_flags="$lyx_flags c++11-mode"
-	AM_CXXFLAGS="$AM_CXXFLAGS -std=gnu++11"
-	;;
+        LYX_CXX_USE_CXX11(gnu++11);;
     esac
     if test x$CLANG = xno || test $lyx_cv_lib_stdcxx = yes; then
       dnl <regex> in gcc is unusable in versions less than 4.9.0
diff --git a/src/support/bind.h b/src/support/bind.h
index 08dd71a885..1449c4394a 100644
--- a/src/support/bind.h
+++ b/src/support/bind.h
@@ -14,7 +14,7 @@
 
 #include "support/functional.h"
 
-#if __cplusplus >= 201103L
+#ifdef LYX_USE_CXX11
 
 #define LYX_BIND_NS std
 
diff --git a/src/support/functional.h b/src/support/functional.h
index b86551d6f6..5d373d1d14 100644
--- a/src/support/functional.h
+++ b/src/support/functional.h
@@ -12,7 +12,7 @@
 #ifndef LYX_FUNCTIONAL_H
 #define LYX_FUNCTIONAL_H
 
-#if __cplusplus >= 201103L
+#ifdef LYX_USE_CXX11
 
 #include <functional>
 #define LYX_FUNCTIONAL_NS std
diff --git a/src/support/lyxalgo.h b/src/support/lyxalgo.h
index 410bf75933..9e44838a79 100644
--- a/src/support/lyxalgo.h
+++ b/src/support/lyxalgo.h
@@ -84,7 +84,7 @@ void eliminate_duplicates(C & c)
 }
 
 
-#if __cplusplus >= 201103L
+#ifdef LYX_USE_CXX11
 using std::next;
 #else
 /// Replacement of std::next for older compilers
@@ -97,7 +97,7 @@ inline It next(It i, Diff n = 1)
 #endif
 
 
-#if __cplusplus >= 201103L
+#ifdef LYX_USE_CXX11
 using std::prev;
 #else
 /// Replacement of std::prev for older compilers
diff --git a/src/support/regex.h b/src/support/regex.h
index 7c64caf432..dd4875e35f 100644
--- a/src/support/regex.h
+++ b/src/support/regex.h
@@ -12,7 +12,7 @@
 #ifndef LYX_REGEXP_H
 #define LYX_REGEXP_H
 
-#if __cplusplus >= 201103L && defined(LYX_USE_STD_REGEX)
+#if defined(LYX_USE_CXX11) && defined(LYX_USE_STD_REGEX)
 #  include <regex>
 #  ifdef _MSC_VER
 namespace lyx {
diff --git a/src/support/shared_ptr.h b/src/support/shared_ptr.h
index 04dfc501a6..d011597a39 100644
--- a/src/support/shared_ptr.h
+++ b/src/support/shared_ptr.h
@@ -12,7 +12,7 @@
 #ifndef LYX_SHARED_PTR_H
 #define LYX_SHARED_PTR_H
 
-#if __cplusplus >= 201103L
+#ifdef LYX_USE_CXX11
 
 #include <memory>
 #define LYX_SHAREDPTR_NS std