git

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#!/bin/sh
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#
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# Probe the compiler for vintage, version, etc. This is used for setting
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# optional make knobs under the DEVELOPER knob.
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CC="$*"
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# we get something like (this is at least true for gcc and clang)
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#
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# FreeBSD clang version 3.4.1 (tags/RELEASE...)
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get_version_line() {
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	LANG=C LC_ALL=C $CC -v 2>&1 | grep ' version '
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}
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get_family() {
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	get_version_line | sed 's/^\(.*\) version [0-9].*/\1/'
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}
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get_version() {
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	# A string that begins with a digit up to the next SP
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	ver=$(get_version_line | sed 's/^.* version \([0-9][^ ]*\).*/\1/')
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	# There are known -variant suffixes that do not affect the
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	# meaning of the main version number.  Strip them.
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	ver=${ver%-win32}
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	ver=${ver%-posix}
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	echo "$ver"
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}
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print_flags() {
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	family=$1
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	version=$(get_version | cut -f 1 -d .)
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	# Print a feature flag not only for the current version, but also
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	# for any prior versions we encompass. This avoids needing to do
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	# numeric comparisons in make, which are awkward.
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	while test "$version" -gt 0
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	do
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		echo $family$version
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		version=$((version - 1))
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	done
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}
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case "$(get_family)" in
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gcc)
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	print_flags gcc
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	;;
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clang | *" clang")
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	print_flags clang
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	;;
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"Apple LLVM")
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	print_flags clang
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	;;
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*)
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	: unknown compiler family
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	;;
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esac
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