linux-kernel - Re: kbuild: prevent make from deleting

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Message-ID: <CACqU3MX7f2oNpDf6W124tfROfKq4PFsyvxiq=VtPJfv-gqUrww@mail.gmail.com>
Date:	Sun, 31 Jul 2011 12:21:37 -0400
From:	Arnaud Lacombe <lacombar@...il.com>
To:	Peter Foley <pefoley2@...izon.net>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Kbuild Mailing List <linux-kbuild@...r.kernel.org>,
	mmarek@...e.cz
Subject: Re: kbuild: prevent make from deleting _shipped files

Hi,

On Sun, Jul 31, 2011 at 11:37 AM, Peter Foley <pefoley2@...izon.net> wrote:
> commit 7373f4f (kbuild: add implicit rules for parser generation)
> created a implicit rule chain (%.c: %.c_shipped: %.y). This causes make to delete the _shipped files
> because it considers them intermediate files. Mark the _shipped files PRECIOUS
> to prevent make from deleting them.
>
> Signed-off-by: Peter Foley <pefoley2@...izon.net>
What make are you using, and what command triggers the issue ?

Those rules should only be visible on parser regeneration (ie.
REGENERATE_PARSERS defined). make 3.82 does not seem to trigger the
issue:

% make -v
GNU Make 3.82

% make REGENERATE_PARSERS=y defconfig
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  SHIPPED scripts/kconfig/zconf.tab.c
  SHIPPED scripts/kconfig/zconf.lex.c
  SHIPPED scripts/kconfig/zconf.hash.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
*** Default configuration is based on 'x86_64_defconfig'
[...]

The shipped file are still there:

% ls scripts/kconfig/*_shipped
scripts/kconfig/zconf.hash.c_shipped
scripts/kconfig/zconf.lex.c_shipped
scripts/kconfig/zconf.tab.c_shipped

Thanks,
 - Arnaud

> ---
>
> 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)
>
>
--
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