From 958d3463f1081a67cbd68b3dcf14624a72c1200f Mon Sep 17 00:00:00 2001
From: Rickard Green <rickard@erlang.org>
Date: Mon, 9 Aug 2010 13:46:22 +0200
Subject: Regenerate bootstrap/{erl,erlc} when switching target

---
 Makefile.in     | 15 +++++++++++----
 prebuild.delete |  1 +
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/Makefile.in b/Makefile.in
index 8453c3bdf5..b420628751 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -485,11 +485,13 @@ dep depend:
 # Creates "erl" and "erlc" in bootstrap/bin which uses the precompiled 
 # libraries in the bootstrap directory
 
+.PHONY: bootstrap_setup_target
+
 # ----------------------------------------------------------------------
 # Bootstraps... 
 # ----------------------------------------------------------------------
 ifeq ($(TARGET),win32)
-bootstrap_setup: check_recreate_primary_bootstrap
+bootstrap_setup: check_recreate_primary_bootstrap bootstrap_setup_target
 	@rm -f $(BOOTSTRAP_ROOT)/bootstrap/bin/erl.exe \
 		$(BOOTSTRAP_ROOT)/bootstrap/bin/erlc.exe \
 		$(BOOTSTRAP_ROOT)/bootstrap/bin/erl.ini \
@@ -501,9 +503,9 @@ bootstrap_setup: check_recreate_primary_bootstrap
 	@cp $(ERL_TOP)/bin/$(TARGET)/erl.exe \
 		$(BOOTSTRAP_ROOT)/bootstrap/bin/erl.exe
 else
-bootstrap_setup: check_recreate_primary_bootstrap $(BOOTSTRAP_ROOT)/bootstrap/bin/erl $(BOOTSTRAP_ROOT)/bootstrap/bin/erlc
+bootstrap_setup: check_recreate_primary_bootstrap bootstrap_setup_target $(BOOTSTRAP_ROOT)/bootstrap/bin/erl $(BOOTSTRAP_ROOT)/bootstrap/bin/erlc
 
-$(BOOTSTRAP_ROOT)/bootstrap/bin/erl:  $(ERL_TOP)/erts/etc/unix/erl.src.src
+$(BOOTSTRAP_ROOT)/bootstrap/bin/erl: $(ERL_TOP)/erts/etc/unix/erl.src.src $(BOOTSTRAP_ROOT)/bootstrap/target
 	@rm -f $(BOOTSTRAP_ROOT)/bootstrap/bin/erl 
 	@sed	-e "s;%FINAL_ROOTDIR%;$(BOOTSTRAP_ROOT)/bootstrap;"   \
 		-e "s;\$$ROOTDIR/erts-.*/bin;$(ERL_TOP)/bin/$(TARGET);"    \
@@ -512,12 +514,17 @@ $(BOOTSTRAP_ROOT)/bootstrap/bin/erl:  $(ERL_TOP)/erts/etc/unix/erl.src.src
 			$(BOOTSTRAP_ROOT)/bootstrap/bin/erl
 	@chmod 755 $(BOOTSTRAP_ROOT)/bootstrap/bin/erl
 
-$(BOOTSTRAP_ROOT)/bootstrap/bin/erlc:  $(ERL_TOP)/bin/$(TARGET)/erlc
+$(BOOTSTRAP_ROOT)/bootstrap/bin/erlc: $(ERL_TOP)/bin/$(TARGET)/erlc $(BOOTSTRAP_ROOT)/bootstrap/target
 	@rm -f $(BOOTSTRAP_ROOT)/bootstrap/bin/erlc
 	@cp $(ERL_TOP)/bin/$(TARGET)/erlc $(BOOTSTRAP_ROOT)/bootstrap/bin/erlc
 	@chmod 755 $(BOOTSTRAP_ROOT)/bootstrap/bin/erlc
 endif
 
+bootstrap_setup_target:
+	@{ test -r $(BOOTSTRAP_ROOT)/bootstrap/target && \
+	   test $(TARGET) = `cat $(BOOTSTRAP_ROOT)/bootstrap/target`; } || \
+	 echo $(TARGET) > $(BOOTSTRAP_ROOT)/bootstrap/target
+
 secondary_bootstrap_build:
 	cd lib && \
 	  ERL_TOP=$(ERL_TOP) PATH=$(BOOT_PREFIX)$${PATH} \
diff --git a/prebuild.delete b/prebuild.delete
index 901480a63d..b1b18adbcb 100644
--- a/prebuild.delete
+++ b/prebuild.delete
@@ -1 +1,2 @@
 bootstrap/lib
+bootstrap/target
-- 
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