git/detect-compiler
Michael J Gruber 1fbfd96f50 detect-compiler: make detection independent of locale
`detect-compiler` has accumulated a few compiler dependent workarounds
lately for the more and more ubiquitious gcc12. This is intended to make
CI set-ups work across tool-chain updates, but also help those
developers who build with `DEVELOPER=1`.

Alas, `detect-compiler` uses the locale dependent output of `$(CC) -v`
to parse for the version string, which fails unless it literally
contains ` version`.

Use `LANG=C $(CC) -v` instead to grep for stable output.

Signed-off-by: Michael J Gruber <git@grubix.eu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2022-05-09 08:52:26 -07:00

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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() {
get_version_line | sed 's/^.* version \([0-9][^ ]*\).*/\1/'
}
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