Stop checking for pre-c++11 compilers since these are no longer

supported

Makefile

@@ -308,10 +308,6 @@ else
 TMPOUT = `mktemp /tmp/test-out-XXXXXX`
 endif
 
-# Detect if we can use C++11
-CXX11_CHECK_CMD = $(CXX) -std=c++11 -o $(TMPOUT) -c test/build/c++11.cc
-HAS_CXX11 = $(shell $(CXX11_CHECK_CMD) 2> /dev/null && echo true || echo false)
-
 CHECK_SHADOW_WORKS_CMD = $(CC) -std=c99 -Werror -Wshadow -o $(TMPOUT) -c test/build/shadow.c
 HAS_WORKING_SHADOW = $(shell $(CHECK_SHADOW_WORKS_CMD) 2> /dev/null && echo true || echo false)
 ifeq ($(HAS_WORKING_SHADOW),true)
@@ -342,11 +338,7 @@ HOST_LD ?= $(LD)
 HOST_LDXX ?= $(LDXX)
 
 CFLAGS += -std=c99 -Wsign-conversion -Wconversion $(W_SHADOW) $(W_EXTRA_SEMI)
-ifeq ($(HAS_CXX11),true)
 CXXFLAGS += -std=c++11
-else
-CXXFLAGS += -std=c++0x
-endif
 CPPFLAGS += -g -Wall -Wextra -Werror -Wno-long-long -Wno-unused-parameter -DOSATOMIC_USE_INLINED=1
 LDFLAGS += -g
 

templates/Makefile.template

@@ -206,10 +206,6 @@
   TMPOUT = `mktemp /tmp/test-out-XXXXXX`
   endif
 
-  # Detect if we can use C++11
-  CXX11_CHECK_CMD = $(CXX) -std=c++11 -o $(TMPOUT) -c test/build/c++11.cc
-  HAS_CXX11 = $(shell $(CXX11_CHECK_CMD) 2> /dev/null && echo true || echo false)
-
   %for warning in CHECK_WARNINGS:
   ${warning_var('CHECK_%s_WORKS_CMD', warning)} = $(CC) -std=c99 -Werror -W${warning} -o $(TMPOUT) -c test/build/${warning}.c
   ${warning_var('HAS_WORKING_%s', warning)} = $(shell $(${warning_var('CHECK_%s_WORKS_CMD', warning)}) 2> /dev/null && echo true || echo false)
@@ -230,11 +226,7 @@
   HOST_LDXX ?= $(LDXX)
 
   CFLAGS += -std=c99 -Wsign-conversion -Wconversion ${' '.join(warning_var('$(W_%s)', warning) for warning in PREFERRED_WARNINGS)}
-  ifeq ($(HAS_CXX11),true)
   CXXFLAGS += -std=c++11
-  else
-  CXXFLAGS += -std=c++0x
-  endif
   % for arg in ['CFLAGS', 'CXXFLAGS', 'CPPFLAGS', 'LDFLAGS', 'DEFINES']:
   %  if defaults.get('global', []).get(arg, None) is not None:
   ${arg} += ${defaults.get('global').get(arg)}

test/build/c++11.cc

@@ -1,52 +0,0 @@
-/*
- *
- * Copyright 2015, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-/* This is just a compilation test, to see if we have C++11. */
-
-#include <stdlib.h>
-#include <zlib.h>
-
-class Base {
- public:
-  virtual void foo() = 0;
-};
-
-class Foo final : public Base {
- public:
-  void foo() override {}
-};
-
-int main() {
-  Foo().foo();
-  return 0;
-}