mk: Allow using a locally compiled libuv.a

Closes #5563

configure

@@ -425,7 +425,8 @@ opt verify-install 1 "verify installed binaries work"
 valopt prefix "/usr/local" "set installation prefix"
 valopt local-rust-root "/usr/local" "set prefix for local rust binary"
 valopt llvm-root "" "set LLVM root"
-valopt jemalloc-root "" "set jemalloc root"
+valopt jemalloc-root "" "set directory where libjemalloc_pic.a is located"
+valopt libuv-root "" "set directory where libuv.a is located"
 valopt android-cross-path "/opt/ndk_standalone" "Android NDK standalone path"
 valopt mingw32-cross-path "" "MinGW32 cross compiler path"
 
@@ -1200,6 +1201,7 @@ putvar CFG_MINGW32_CROSS_PATH
 putvar CFG_MANDIR
 putvar CFG_DISABLE_INJECT_STD_VERSION
 putvar CFG_JEMALLOC_ROOT
+putvar CFG_LIBUV_ROOT
 
 # Avoid spurious warnings from clang by feeding it original source on
 # ccache-miss rather than preprocessed input.

mk/rt.mk

@@ -204,19 +204,17 @@ $$(LIBUV_MAKEFILE_$(1)): $$(LIBUV_DEPS) $$(MKFILE_DEPS) $$(LIBUV_STAMP_$(1))
 # theory when we support msvc then we should be using gyp's msvc output instead
 # of mingw's makefile for windows
 ifdef CFG_WINDOWSY_$(1)
-$$(LIBUV_LIB_$(1)): $$(LIBUV_DEPS) $$(MKFILE_DEPS)
+LIBUV_LOCAL_$(1) := $$(S)src/libuv/libuv.a
+$$(LIBUV_LOCAL_$(1)): $$(LIBUV_DEPS) $$(MKFILE_DEPS)
 	$$(Q)$$(MAKE) -C $$(S)src/libuv -f Makefile.mingw \
 		LDFLAGS="$$(CFG_GCCISH_LINK_FLAGS_$(1))" \
 		CC="$$(CC_$(1)) $$(LIBUV_CFLAGS_$(1)) $$(SNAP_DEFINES)" \
 		CXX="$$(CXX_$(1))" \
 		AR="$$(AR_$(1))" \
 		V=$$(VERBOSE)
-	$$(Q)cp $$(S)src/libuv/libuv.a $$@
 else
-$$(LIBUV_LIB_$(1)): $$(LIBUV_DIR_$(1))/Release/libuv.a $$(MKFILE_DEPS)
-	$$(Q)cp $$< $$@
-$$(LIBUV_DIR_$(1))/Release/libuv.a: $$(LIBUV_DEPS) $$(LIBUV_MAKEFILE_$(1)) \
-				    $$(MKFILE_DEPS)
+LIBUV_LOCAL_$(1) := $$(LIBUV_DIR_$(1))/Release/libuv.a
+$$(LIBUV_LOCAL_$(1)): $$(LIBUV_DEPS) $$(LIBUV_MAKEFILE_$(1)) $$(MKFILE_DEPS)
 	$$(Q)$$(MAKE) -C $$(LIBUV_DIR_$(1)) \
 		CFLAGS="$$(LIBUV_CFLAGS_$(1)) $$(SNAP_DEFINES)" \
 		LDFLAGS="$$(CFG_GCCISH_LINK_FLAGS_$(1))" \
@@ -231,6 +229,19 @@ $$(LIBUV_DIR_$(1))/Release/libuv.a: $$(LIBUV_DEPS) $$(LIBUV_MAKEFILE_$(1)) \
 
 endif
 
+ifeq ($(1),$$(CFG_BUILD))
+ifneq ($$(CFG_LIBUV_ROOT),)
+$$(LIBUV_LIB_$(1)): $$(CFG_LIBUV_ROOT)/libuv.a
+	$$(Q)cp $$< $$@
+else
+$$(LIBUV_LIB_$(1)): $$(LIBUV_LOCAL_$(1))
+	$$(Q)cp $$< $$@
+endif
+else
+$$(LIBUV_LIB_$(1)): $$(LIBUV_LOCAL_$(1))
+	$$(Q)cp $$< $$@
+endif
+
 ################################################################################
 # jemalloc
 ################################################################################
@@ -273,11 +284,11 @@ $$(JEMALLOC_LIB_$(1)): $$(CFG_JEMALLOC_ROOT)/libjemalloc_pic.a
 	@$$(call E, copy: jemalloc)
 	$$(Q)cp $$< $$@
 else
-$$(JEMALLOC_LIB_$(1)):
+$$(JEMALLOC_LIB_$(1)): $$(JEMALLOC_LOCAL_$(1))
 	$$(Q)cp $$< $$@
 endif
 else
-$$(JEMALLOC_LIB_$(1)):
+$$(JEMALLOC_LIB_$(1)): $$(JEMALLOC_LOCAL_$(1))
 	$$(Q)cp $$< $$@
 endif