. ./redoconf.rc
rc_include

rc_helpmsg ARCH "Architecture prefix for output (eg. i686-w64-mingw32-)"
rc_helpmsg CC "C compiler name (cc)"
rc_helpmsg CPPFLAGS "Extra C preprocessor flags (eg. -I... -D...)"
rc_helpmsg CFLAGS "Extra C compiler flags (eg. -O2 -g)"
rc_helpmsg OPTFLAGS "C/C++ compiler flag overrides (eg. -g0)"
rc_helpmsg LINK "Linker name (cc)"
rc_helpmsg LDFLAGS "Extra linker options (eg. -s -static)"
rc_helpmsg LIBS "Extra libraries to always link against (eg. -lsocket)"
rc_helpmsg STATIC "Link libraries and binaries statically"

if [ -n "$CC" ]; then
	set -- "$CC"
else
	if [ -n "$ARCH" ] && [ "$ARCH" = "${ARCH%-}" ]; then
		# Make sure arch name includes trailing dash if nonempty
		ARCH="$ARCH-"
	fi
	set -- \
	    "${ARCH}cc" "${ARCH}gcc" \
	    "${ARCH}clang" "/usr/bin/${ARCH}clang"-[0-9]* \
	    "${ARCH}c++" "${ARCH}g++" \
	    "${ARCH}clang++" "/usr/bin/${ARCH}clang++"-[0-9]*
fi

rc_appendln CPPFLAGS "-I."
[ -n "$STATIC" ] && rc_appendln LDFLAGS "-static"

for d in "$@"; do
	echo "Trying C compiler: '$d'" >&2
	if CC="$d" CXX="" LINK="$d" rc_compile cc link 'extern int i;'; then
		rc_replaceln CC "$d"
		rc_replaceln LINK "$d"

		# mingw32 (not mingw64) generates binaries that need
		# a dynamic libgcc at runtime for certain operations
		# (like 64-bit integer division), which is non-obvious.
		# Include it statically if possible, but only on Windows,
		# which we'll detect by whether windows.h exists.
		#
		# If adding the option fails, maybe it's some
		# compiler other than gcc, so that's fine.
		x="-static-libgcc$NL-static-libstdc++"
		appendln LDFLAGS "$x"
		prog='#include <windows.h>'
		if CC="$d" LINK="$d" rc_compile cc link "$prog"; then
			rc_appendln LDFLAGS "$x"
		fi

		# Set ARCH= to the right compiler prefix, either empty
		# (use native compiler) or something like "i686-w64-mingw32-"
		# (terminating dash), based on the compiler name.
		x="-${CC##*/}"
		x="${x%-*}"
		x="${x#-}"
		[ -n "$x" ] && x="$x-"
		rc_replaceln ARCH "$x"
		rc_replaceln HAVE_CC 1
		rc_save
		exit 0
	fi
done

echo "Can't find a working C compiler." >&2
rc_undo
rc_replaceln CC ""
rc_save