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Date: Sun, 31 Jul 2011 14:45:40 -0400 (EDT)
From: Peter Foley <pefoley2@verizon.net>
To: Arnaud Lacombe <lacombar@gmail.com>
Cc: Peter Foley <pefoley2@verizon.net>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Kbuild Mailing List <linux-kbuild@vger.kernel.org>,
        mmarek@suse.cz
Subject: [PATCH v2] kbuild: prevent make from deleting _shipped files
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commit 7373f4f (kbuild: add implicit rules for parser generation)
created a implicit rule chain (%.c: %.c_shipped: %.y).
Make considers the _shipped files to be intermediate files which 
causes them to be deleted if they didn't exist before make was run.
Mark the _shipped files PRECIOUS to prevent make from deleting them.

Signed-off-by: Peter Foley <pefoley2@verizon.net>
---

V2: update changelog to specify files are only deleted when they did not 
already exist

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index aeea84a..5d986d9 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -167,6 +167,7 @@ ifdef REGENERATE_PARSERS
 quiet_cmd_gperf = GPERF $@
       cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
 
+.PRECIOUS: $(src)/%.hash.c_shipped
 $(src)/%.hash.c_shipped: $(src)/%.gperf
 	$(call cmd,gperf)
 
@@ -177,6 +178,7 @@ LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
 quiet_cmd_flex = LEX     $@
       cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
 
+.PRECIOUS: $(src)/%.lex.c_shipped
 $(src)/%.lex.c_shipped: $(src)/%.l
 	$(call cmd,flex)
 
@@ -187,12 +189,14 @@ YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
 quiet_cmd_bison = YACC    $@
       cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
 
+.PRECIOUS: $(src)/%.tab.c_shipped
 $(src)/%.tab.c_shipped: $(src)/%.y
 	$(call cmd,bison)
 
 quiet_cmd_bison_h = YACC    $@
       cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
 
+.PRECIOUS: $(src)/%.tab.h_shipped
 $(src)/%.tab.h_shipped: $(src)/%.y
 	$(call cmd,bison_h)