1 files changed, 83 insertions, 3 deletions
diff --git a/configure b/configure
index 70a0698..d3ea49e 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,85 @@
-#!/bin/sh
+#!/bin/bash
 
-for f in args/"$1"/*; do
-	ln -sf "$f"
+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
+)
+
+CFLAGS+=(-std=c11 -fPIC)
+
+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
+  PKG_CONFIG  pkg-config
+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 $@"
+	echo "CC=$CC"
+	echo "CFLAGS=(${CFLAGS[@]@Q})"
+	echo "CPPFLAGS=(${CPPFLAGS[@]@Q})"
+	echo "LDFLAGS=(${LDFLAGS[@]@Q})"
+	echo "LDLIBS=(${LDLIBS[@]@Q})"
+} >.config.rc
+[[ $verbose ]] && cat .config.rc
+[[ $gen_flags ]] && printf '%s\n' "${CFLAGS[@]}" "${CPPFLAGS[@]}" >compile_flags.txt