From ad63374e26f6a314315a06b9e415fafc0366158a Mon Sep 17 00:00:00 2001
From: Georg Baum <baum@lyx.org>
Date: Sun, 5 Jun 2016 15:40:00 +0200
Subject: [PATCH] Require at least gcc 4.3

This is a prerequisite for mandatory C++11 support.
I could not find a cmake gcc version check btw.
---
 INSTALL              | 2 +-
 config/lyxinclude.m4 | 9 +++------
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/INSTALL b/INSTALL
index 2ddcd8d055..f53361d954 100644
--- a/INSTALL
+++ b/INSTALL
@@ -49,7 +49,7 @@ Requirements
 
 First of all, you will need a recent C++ compiler, where recent means
 that the compilers are close to C++ standard conforming like gcc (at
-least 4.x) or clang. Note that the compiler will be used in C++11 mode
+least 4.3) or clang. Note that the compiler will be used in C++11 mode
 when possible.
 
 LyX makes great use of the C++ Standard Template Library (STL).
diff --git a/config/lyxinclude.m4 b/config/lyxinclude.m4
index 1f1fdb67e7..9ba8a871bc 100644
--- a/config/lyxinclude.m4
+++ b/config/lyxinclude.m4
@@ -194,7 +194,7 @@ AC_DEFUN([LYX_CXX_USE_REGEX],
        dnl <regex> in gcc is unusable in versions less than 4.9.0
        dnl see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53631
        case $gxx_version in
-         4.0*|4.1*|4.2*|4.3*|4.4*|4.5*|4.6*|4.7*|4.8*) lyx_std_regex=no ;;
+         4.3*|4.4*|4.5*|4.6*|4.7*|4.8*) lyx_std_regex=no ;;
          *) ;;
        esac
      fi
@@ -344,7 +344,8 @@ if test x$GXX = xyes; then
       AM_CPPFLAGS="$AM_CPPFLAGS -Wall -Wextra"
   fi
   case $gxx_version in
-      2.*|3.*) AC_ERROR([gcc 4.x is required]);;
+      2.*|3.*) AC_ERROR([gcc >= 4.3 is required]);;
+      4.0*|4.1*|4.2*) AC_ERROR([gcc >= 4.3 is required]);;
   esac
   if test x$enable_stdlib_debug = xyes ; then
     dnl FIXME: for clang/libc++, one should define _LIBCPP_DEBUG2=0
@@ -361,10 +362,6 @@ if test x$GXX = xyes; then
   dnl By default, it is auto and we enable C++11 when possible
   if test x$enable_cxx11 != xno ; then
     case $gxx_version in
-      4.0*|4.1*|4.2*)
-         if test x$enable_cxx11 = xyes; then
-            AC_ERROR([There is no C++11 support in gcc 4.2 or older])
-         fi;;
       4.3*|4.4*|4.5*|4.6*)
         dnl Note that this will define __GXX_EXPERIMENTAL_CXX0X__.
         dnl The source code relies on that.