Clean rlib target when rustc bumped up

Author: nobu

defs/rustc.mk

@@ -0,0 +1,8 @@
+ifndef rustc-version-check
+rustc-version-check := target/.rustc-version
+target/.rustc-version:
+	$(eval prev_version := $(if $(wildcard $@),$(shell cat $@)))
+	$(eval curr_version := $(shell $(RUSTC) -V | cut -d' ' -f2))
+	$(if $(filter-out $(prev_version),$(curr_version)), \
+	rm -fr $(@D) && mkdir $(@D) && echo $(curr_version) > $@)
+endif

yjit/yjit.mk

@@ -1,4 +1,5 @@
 # -*- mode: makefile-gmake; indent-tabs-mode: t -*-
+include $(top_srcdir)/defs/rustc.mk
 
 YJIT_SRC_FILES = $(wildcard \
 	$(top_srcdir)/yjit/Cargo.* \
@@ -16,14 +17,14 @@ BUILD_YJIT_LIBS = $(TOP_BUILD_DIR)/$(YJIT_LIBS)
 # In a YJIT-only build (no ZJIT)
 ifneq ($(strip $(YJIT_LIBS)),)
 yjit-libs: $(BUILD_YJIT_LIBS)
-$(BUILD_YJIT_LIBS): $(YJIT_SRC_FILES)
+$(BUILD_YJIT_LIBS): $(YJIT_SRC_FILES) $(rustc-version-check)
 	$(ECHO) 'building Rust YJIT (release mode)'
 	$(gnumake_recursive)$(Q) $(RUSTC) $(YJIT_RUSTC_ARGS)
 else ifneq ($(strip $(RLIB_DIR)),) # combo build
 # Absolute path to avoid VPATH ambiguity
 YJIT_RLIB = $(TOP_BUILD_DIR)/$(RLIB_DIR)/libyjit.rlib
 
-$(YJIT_RLIB): $(YJIT_SRC_FILES)
+$(YJIT_RLIB): $(YJIT_SRC_FILES) $(rustc-version-check)
 	$(ECHO) 'building $(@F)'
 	$(gnumake_recursive)$(Q) $(RUSTC) '-L$(@D)' --extern=jit $(YJIT_RUSTC_ARGS)
 

zjit/zjit.mk

@@ -1,4 +1,5 @@
 # -*- mode: makefile-gmake; indent-tabs-mode: t -*-
+include $(top_srcdir)/defs/rustc.mk
 
 # Put no definitions when ZJIT isn't configured
 ifneq ($(ZJIT_SUPPORT),no)
@@ -20,14 +21,14 @@ BUILD_ZJIT_LIBS = $(TOP_BUILD_DIR)/$(ZJIT_LIBS)
 
 # In a ZJIT-only build (no YJIT)
 ifneq ($(strip $(ZJIT_LIBS)),)
-$(BUILD_ZJIT_LIBS): $(ZJIT_SRC_FILES)
+$(BUILD_ZJIT_LIBS): $(ZJIT_SRC_FILES) $(rustc-version-check)
 	$(ECHO) 'building Rust ZJIT (release mode)'
 	$(gnumake_recursive)$(Q) $(RUSTC) $(ZJIT_RUSTC_ARGS)
 else ifneq ($(strip $(RLIB_DIR)),) # combo build
 # Absolute path to avoid VPATH ambiguity
 ZJIT_RLIB = $(TOP_BUILD_DIR)/$(RLIB_DIR)/libzjit.rlib
 
-$(ZJIT_RLIB): $(ZJIT_SRC_FILES)
+$(ZJIT_RLIB): $(ZJIT_SRC_FILES) $(rustc-version-check)
 	$(ECHO) 'building $(@F)'
 	$(gnumake_recursive)$(Q) $(RUSTC) '-L$(@D)' --extern=jit $(ZJIT_RUSTC_ARGS)