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xen-devel
Re: [Xen-devel] [RFC] build: use xargs in conjunction with etags
Horms <horms@xxxxxxxxxxxx> writes:
> The existing etags invocation does not seem to work for me,
> but using xargs in the same way that it is used for crats does.
> I'm pretty sure that is because on Debian etags == ctags,
> does anyone have etags lying around to test if this works?
>
> Also, I'm pretty sure this xargs approach will break for both ctags
> and etags if there are too many files to for one command line,
> as ctags/etags will be invoked multiple times, and the resulting
> tags file will only contain the tags for the last invocation.
>
> Signed-Off-By: Horms <horms@xxxxxxxxxxxx>
> --- x/xen/Makefile
> +++ x/xen/Makefile
> @@ -132,7 +136,7 @@ endef
>
> .PHONY: _TAGS
> _TAGS:
> - $(all_sources) | etags -
> + $(all_sources) | xargs etags
When xargs invokes etags more than once (i.e. it's actually needed),
each invocation will clobber the output of the previous one. To run
etags on an arbitrarily long file list, try something like
rm -f TAGS && $(all_sources) | xargs etags -a
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