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41 lines
1.4 KiB
Bash
41 lines
1.4 KiB
Bash
#! /bin/sh
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#
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# cpp11-gcc
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#
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# Detect compatible GCC version and add c++11/14 flags
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#
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# From the online doc
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# __GNUC__
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# __GNUC_MINOR__
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# __GNUC_PATCHLEVEL__
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# These macros are defined by all GNU compilers that use the C preprocessor: C, C++, Objective-C and Fortran.
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# Their values are the major version, minor version, and patch level of the compiler, as integer constants.
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# For example, GCC 3.2.1 will define __GNUC__ to 3, __GNUC_MINOR__ to 2, and __GNUC_PATCHLEVEL__ to 1. i
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# These macros are also defined if you invoke the preprocessor directly.
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#
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# __VERSION__
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# This macro expands to a string constant which describes the version of the compiler in use.
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# You should not rely on its contents having any particular form, but it can be counted on to contain
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# at least the release number.
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#
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GNUMAJOR := $(shell $(CXX) -E -dM - < /dev/null | grep __GNUC__ | sed -e 's/^.* //g')
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GNUMINOR := $(shell $(CXX) -E -dM - < /dev/null | grep __GNUC_MINOR__ | sed -e 's/^.* //g')
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GNUPATCH := $(shell $(CXX) -E -dM - < /dev/null | grep __GNUC_PATCHLEVEL__ | sed -e 's/^.* //g')
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GCCVERSION := $(GNUMAJOR)$(GNUMINOR)$(GNUPATCH)
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#
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# GCC 4.8 (or 4.6?) doesn't accept -std=c++11, only -std=c++0x.
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#
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# C++14 needs GCC 4.9.2
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ifeq ($(shell test $(GCCVERSION) -ge 492 && echo 1), 1)
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CXXFLAGS += -std=c++14
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# C++11 needs GCC 4.8.1
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else ifeq ($(shell test $(GCCVERSION) -ge 481 && echo 1), 1)
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CXXFLAGS += -std=c++11
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else
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CXXFLAGS += -std=c++03
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endif
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