contrib: luac: add luac cross-compiler

contrib/src/lua/rules.mak

@@ -25,12 +25,12 @@ LUA_TARGET := solaris
 endif
 
 # Feel free to add autodetection if you need to...
-PKGS += lua
+PKGS += lua luac
 ifeq ($(call need_pkg,"lua5.2"),)
-PKGS_FOUND += lua
+PKGS_FOUND += lua luac
 endif
 ifeq ($(call need_pkg,"lua5.1"),)
-PKGS_FOUND += lua
+PKGS_FOUND += lua luac
 endif
 
 $(TARBALLS)/lua-$(LUA_VERSION).tar.gz:
@@ -81,3 +81,17 @@ ifdef HAVE_WIN32
 	cp $</etc/lua.pc "$(PREFIX)/lib/pkgconfig/"
 endif
 	touch $@
+
+luac: lua-$(LUA_VERSION).tar.gz .sum-lua
+	# DO NOT use the same intermediate directory as the lua target
+	rm -Rf -- $@-$(LUA_VERSION) $@
+	mkdir -- $@-$(LUA_VERSION)
+	tar -x -v -z -C $@-$(LUA_VERSION) --strip-components=1 -f $<
+	(cd luac-$(LUA_VERSION) && patch -p1) < $(SRC)/lua/luac-32bits.patch
+	mv luac-$(LUA_VERSION) luac
+
+.luac: luac
+	cd $< && $(MAKE) generic
+	mkdir -p -- $(BUILDBINDIR)
+	cp -fv -- $</src/luac $(BUILDBINDIR)/$(HOST)-luac
+	touch $@

contrib/src/main.mak

@@ -32,6 +32,9 @@ CONTRIB_VIDEOLAN := http://downloads.videolan.org/pub/contrib
 
 PREFIX ?= $(TOPDST)/$(HOST)
 PREFIX := $(abspath $(PREFIX))
+BUILDPREFIX ?= $(TOPDST)
+BUILDPREFIX := $(abspath $(BUILDPREFIX))
+BUILDBINDIR ?= $(BUILDPREFIX)/bin
 ifneq ($(HOST),$(BUILD))
 HAVE_CROSS_COMPILE = 1
 endif