linux-kernel - Re: [PATCH] Re: 'make headers_check' failed to install headers to arbitrary location

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Date:	Thu, 04 Jun 2009 19:07:15 +0200
From:	Wolfgang Denk <wd@...x.de>
To:	Sergei Poselenov <sposelenov@...raft.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Re: 'make headers_check' failed to install headers to arbitrary location

Dear Sergei,

In message <20090604175536.2a1d0add@...raft.com> you wrote:
> 
> Here is another version of the patch which fixes
> the "Argument list too long" error for "make headers_check", used xargs
> to minimize the perl calls (thanks, Wolfgang).

Hm... but now we have a useless use of cat and a temp file.

> -      cmd_check = $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH) \
> -                  $(addprefix $(install)/, $(all-files));           \
> +# Headers list can be pretty long, xargs helps to avoid
> +# the "Argument list too long" error.
> +      cmd_check = rm -f hdrlist; touch hdrlist;                      \
> +                  for f in $(all-files); do                          \
> +                  echo "$(install)/$${f} " >> hdrlist; done;         \
> +                  cat hdrlist | xargs                                \
> +                  $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \
> +                  rm -f hdrlist;                                     \

Why not simply:

	for f in $(all-files); do
		echo "$(install)/$${f}"
	done | xargs $(PERL) ...

?

Best regards,

Wolfgang Denk

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