require C++14

Move build requirements from C++11 to C++14, for contrib and core.

[GR: ci msg + contrib support + m4 update]

Change-Id: I22793ba1ca06ea7c45d237c882a92d20a008f76f
Reviewed-by: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>
Signed-off-by: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>

configure.ac

@@ -139,8 +139,8 @@ DOLT
 
 lt_cv_deplibs_check_method=pass_all
 
-dnl Check for C++11 support
-AX_CXX_COMPILE_STDCXX_11([ext],[mandatory])
+dnl Check for C++14 support
+AX_CXX_COMPILE_STDCXX(14,[ext],[mandatory])
 
 dnl Check for header files
 AC_FUNC_ALLOCA

contrib/src/boost/0001-Add-build-boost-for-iOS-script.patch

@@ -40,7 +40,7 @@ index 0000000..cca155e
 +echo "cd-ing to $here"
 +cd "$here" || exit 1
 +
-+CPPSTD=c++11    #c++89, c++99, c++14
++CPPSTD=c++14    #c++89, c++99, c++14
 +STDLIB=libc++   # libstdc++
 +COMPILER=clang++
 +PARALLEL_MAKE=16   # how many threads to make boost with

contrib/src/boost/rules.mak

@@ -26,7 +26,7 @@ BOOST_B2_OPTS += target-os=windows \
 				 binary-format=pe \
 				 architecture=x86 \
 				 --user-config=user-config.jam \
-				 cxxflags="-std=c++11 -fPIC -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions --param=ssp-buffer-size=4"
+				 cxxflags="-std=c++14 -fPIC -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions --param=ssp-buffer-size=4"
 endif
 ifdef HAVE_ANDROID
 BOOST_B2_OPTS += --user-config=user-config.jam

contrib/src/main.mak

@@ -133,7 +133,7 @@ LD=xcrun ld
 STRIP=xcrun strip
 RANLIB=xcrun ranlib
 EXTRA_COMMON := -isysroot $(MACOSX_SDK) -mmacosx-version-min=$(MIN_OSX_VERSION) -DMACOSX_DEPLOYMENT_TARGET=$(MIN_OSX_VERSION)
-EXTRA_CXXFLAGS += -std=c++11 -stdlib=libc++
+EXTRA_CXXFLAGS += -stdlib=libc++
 EXTRA_LDFLAGS += -Wl,-syslibroot,$(MACOSX_SDK)
 ifeq ($(ARCH),x86_64)
 EXTRA_COMMON += -m64
@@ -174,7 +174,7 @@ else
 EXTRA_CFLAGS += -mios-simulator-version-min=$(MIN_IOS_VERSION)
 endif
 
-EXTRA_CXXFLAGS=$(EXTRA_CFLAGS) -std=c++11 -stdlib=libc++
+EXTRA_CXXFLAGS=$(EXTRA_CFLAGS) -stdlib=libc++
 EXTRA_LDFLAGS=$(EXTRA_CFLAGS)
 
 endif
@@ -183,7 +183,6 @@ ifdef HAVE_WIN32
 ifneq ($(shell $(CC) $(CFLAGS) -E -dM -include _mingw.h - < /dev/null | grep -E __MINGW64_VERSION_MAJOR),)
 HAVE_MINGW_W64 := 1
 endif
-EXTRA_CXXFLAGS += -std=c++11
 endif
 
 ifdef HAVE_SOLARIS
@@ -194,6 +193,8 @@ EXTRA_COMMON += -m32
 endif
 endif
 
+EXTRA_CXXFLAGS += -std=c++14
+
 cppcheck = $(shell $(CC) $(CFLAGS) -E -dM - < /dev/null | grep -E $(1))
 
 EXTRA_CPPFLAGS += -I$(PREFIX)/include

m4/ax_cxx_compile_stdcxx_11.m4

-# ============================================================================
-#  http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_11.html
-# ============================================================================
-#
-# SYNOPSIS
-#
-#   AX_CXX_COMPILE_STDCXX_11([ext|noext], [mandatory|optional])
-#
-# DESCRIPTION
-#
-#   Check for baseline language coverage in the compiler for the C++11
-#   standard; if necessary, add switches to CXX to enable support.
-#
-#   This macro is a convenience alias for calling the AX_CXX_COMPILE_STDCXX
-#   macro with the version set to C++11.  The two optional arguments are
-#   forwarded literally as the second and third argument respectively.
-#   Please see the documentation for the AX_CXX_COMPILE_STDCXX macro for
-#   more information.  If you want to use this macro, you also need to
-#   download the ax_cxx_compile_stdcxx.m4 file.
-#
-# LICENSE
-#
-#   Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
-#   Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
-#   Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
-#   Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com>
-#   Copyright (c) 2015 Paul Norman <penorman@mac.com>
-#   Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
-#
-#   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 15
-
-include([ax_cxx_compile_stdcxx.m4])
-
-AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [AX_CXX_COMPILE_STDCXX([11], [$1], [$2])])