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#!/bin/sh
# Copyright © Tavian Barnes <tavianator@tavianator.com>
# SPDX-License-Identifier: 0BSD
# Add flags to a makefile if a build succeeds. Source files can specify their
# own flags with lines like
#
# /// _CFLAGS += -Wmissing-variable-declarations
#
# which will be added to the makefile on success, or lines like
#
# /// -Werror
#
# which are just used for the current file. Lines like
#
# /// ---
#
# separate groups of flags, to try multiple ways to achieve something, e.g.
#
# /// CFLAGS += -pthread
# /// ---
# /// LDLIBS += -lpthread
set -eu
# Any new flags we're using
FLAGS=""
# Any new makefile lines we're printing
OUTPUT=""
# Check the existing flags so we don't add duplicates
OLD_FLAGS=" $XCPPFLAGS $XCFLAGS $XLDFLAGS $XLDLIBS "
add_flag() {
if [ "${OLD_FLAGS#* $1 }" = "$OLD_FLAGS" ]; then
FLAGS="${FLAGS}${FLAGS:+ }$1"
else
return 1
fi
}
try_cc() {
build/cc.sh "$@" $FLAGS || return $?
printf '%s' "$OUTPUT"
exit
}
while IFS="" read -r line; do
case "$line" in
"/// "*)
line="${line#/// }"
;;
*)
continue
;;
esac
case "$line" in
---)
try_cc "$@" || :
FLAGS=
OUTPUT=
;;
*=*)
if add_flag "${line#*= }"; then
OUTPUT="${OUTPUT}${line}
"
fi
;;
*)
add_flag "$line" || :
;;
esac
done <"$1"
try_cc "$@"
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