Re: Automake Digest, Vol 175, Issue 3

[Thomas Jahns]

Hello,

On 09/06/17 00:57, Nick Bowler wrote:
> On 2017-09-05, Kip Warner <address@hidden> wrote:
> [...]
> > Hey Thomas. Good question. It could well be that no hackery at all is
> > required with this. Here is my Makefile.am:
> >
> > https://github.com/cartesiantheatre/narayan-designer/blob/master/Source/Makefile.am
> >
> > See parser_clobbered_source_full_paths as an example. This variant
> > containing the full path is used in BUILT_SOURCES, nodist_..._SOURCES,
> > CLEANFILES, and as a target.
> >
> > The parser_clobbered_source_files_only variant containing the file
> > names only is used on line 150 as a workaround for where bisonc++(1)
> > emits its files.
> >
> > If you can see a more elegant way of solving the same problem I'm
> > trying to, I'm all ears.
>
> If your only uses of the directoryless-filenames are in rules, then
> just write the names including directories in the make variables,
> then strip off the directory components inside the rule.  In rules
> you can use the much more powerful shell constructs.
>
> Example:
>
>    % cat >Makefile <<'EOF'
>    FOO = a b/c d/e/f
>
>    my_rule:
>         for i in $(FOO); do \
>           case $$i in */*) i=`expr "$$i" : '.*/\(.*\)'`; esac; \
>           printf '%s\n' "$$i"; \
>         done
> EOF
>    % make my_rule
>    a
>    c
>    f

Really the only part, where names need to be included verbatim is in so-called 
automake primaries. Those need the names for the make dist rules. In other 
words, files that are not distributed don't need to be spelled out, the name can 
be computed instead. If you want to add or remove the directory part is then 
more a question of whether the files with or without need to go into the 
distribution tar.xz.

> If you assume a reasonably-POSIXish shell, you can use something like
> $${i##*/} to strip directory parts instead (I think this form will fail
> on at least Solaris /bin/sh).

That's an argument in favor of adding the directory part since no comparable 
portability headache applies to

"dir/$$i"

Regards, Thomas

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