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#!/bin/bash
CFLAGS=(-std=c11 -fPIC)
CPPFLAGS=()
LDLIBS=()
LDFLAGS=()
warnings=(
-Wall -Wcast-align -Wcast-qual -Wextra -Wpedantic -Wformat=2
-Winit-self -Wmissing-prototypes -Wpointer-arith -Wshadow
-Wstrict-prototypes -Wsuggest-attribute=format
-Wsuggest-attribute=noreturn
)
usage () { echo "Usage: $0 [-h|options...]"; }
help () {
cat <<EOF
Options:
-B ldlib Append ldlib to LDLIBS
-C cflag Append cflag to CFLAGS
-L ldflag Append ldflag to LDFLAGS
-P cppflag Append cppflag to CPPFLAGS
-c when Enable compiler colours (always|auto|off) [default: auto]
-d Enable debugging flags
-e Enable -Werror
-f Generate a compile_flags.txt
-h Show this help
-o Enable optimisation flags
-v Print results of configuration
-w Enable warning flags
Environment:
CC C compiler
EOF
}
check() {
what=$1
shift
for p do
if command -v "$p" >/dev/null 2>&1; then
echo "$p"
return
fi
done
echo "$what not set or found" >&2
return 1
}
CC=$(check '$CC, cc, gcc or clang' "$CC" cc gcc clang) || exit
colour=auto
while getopts B:C:L:P:c:defhovw opt; do
case $opt in
B) LDLIBS+=("$OPTARG");;
C) CFLAGS+=("$OPTARG");;
L) LDFLAGS+=("$OPTARG");;
P) CPPFLAGS+=("$OPTARG");;
c) colour="$OPTARG";;
d) CFLAGS+=(-Og -g); LDFLAGS+=(-Og -g);;
e) CFLAGS+=(-Werror);;
f) gen_flags=1;;
h) usage; help; exit;;
o) CFLAGS+=(-O2 -flto); LDFLAGS+=(-O2 -flto);;
v) verbose=1;;
w) CFLAGS+=("${warnings[@]}");;
?) usage >&2; exit 1;;
esac
done
if [[ $colour == auto && -t 1 ]]; then
colour=always
fi
if [[ $colour == always ]]; then
CFLAGS+=(-fdiagnostics-color)
fi
{
echo "# generated using $0 $@"
declare -p CC CFLAGS CPPFLAGS LDFLAGS LDLIBS
} >.config.rc
[[ $verbose ]] && cat .config.rc
[[ $gen_flags ]] && printf '%s\n' "${CFLAGS[@]}" "${CPPFLAGS[@]}" >compile_flags.txt
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