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