#! /bin/sh
#
# $Id: //poco/1.4/build/script/cpp11-gcc#1 $
#
# cpp11-gcc
#
# Detect compatible GCC version and add c++11/14 flags
#
# From the online doc
# __GNUC__
# __GNUC_MINOR__
# __GNUC_PATCHLEVEL__
# These macros are defined by all GNU compilers that use the C preprocessor: C, C++, Objective-C and Fortran. 
# Their values are the major version, minor version, and patch level of the compiler, as integer constants. 
# For example, GCC 3.2.1 will define __GNUC__ to 3, __GNUC_MINOR__ to 2, and __GNUC_PATCHLEVEL__ to 1. i
# These macros are also defined if you invoke the preprocessor directly. 
#
# __VERSION__
# This macro expands to a string constant which describes the version of the compiler in use. 
# You should not rely on its contents having any particular form, but it can be counted on to contain
# at least the release number.
#


GNUMAJOR   := $(shell $(CXX) -E -dM - < /dev/null | grep __GNUC__ | sed -e 's/^.* //g')
GNUMINOR   := $(shell $(CXX) -E -dM - < /dev/null | grep __GNUC_MINOR__ | sed -e 's/^.* //g')
GNUPATCH   := $(shell $(CXX) -E -dM - < /dev/null | grep __GNUC_PATCHLEVEL__ | sed -e 's/^.* //g')
GCCVERSION := $(GNUMAJOR)$(GNUMINOR)$(GNUPATCH)


#
# GCC 4.8 (or 4.6?) doesn't accept -std=c++11, only -std=c++0x.
#
# C++14 needs GCC 4.9.2
ifeq ($(shell test $(GCCVERSION) -ge 492 && echo 1), 1)
	CXXFLAGS += -std=c++14
# C++11 needs GCC 4.8.1
else ifeq ($(shell test $(GCCVERSION) -ge 481 && echo 1), 1)
	CXXFLAGS += -std=c++11
else
	CXXFLAGS += -std=c++03
endif