bug#54063: automake cannot run without generated Texinfo manual

[Mike Frysinger]

On 19 Feb 2022 15:03, Patrice Dumas wrote:
> In Texinfo, we have a texinfo manual which is automatically generated
> from Pod sections from Texinfo perl modules.  When this generated manual
> is removed, automake cannot run anymore.  To workaround this issue, we
> have a generation of a fake manual that contains only @setfilename 
> manual.info 
> in the autogen.sh script that can be used to bootstrap some other
> autogenerated things, in particular Makefile fragments.  However, this
> is not practical, in particular if the generated manual is removed and
> the Makefile.am file is modified, one need to redo a fake manual in
> order to have things being ok again.
> 
> It seems to me that one way to avoid the issue would be if automake used
> only the texinfo manual name to construct the rules.  It would probably
> be a good thing to do irrespective of this issue, as @setfilename is not
> as important as it used to be, now it is fully optional, and we probably
> should consider as a best practice not to have @setfilename in Texinfo
> manuals.
> 
> The manual is in doc/tp_api in the texinfo sources, it is tp_api.texi.

automake already has some fallback logic if @setfilename isn't set -- it
uses the basename of the source file and changes .texi to .info.  but it
doesn't work if the file doesn't exist.  i think that should be easy to
support.

--- a/bin/automake.in
+++ b/bin/automake.in
@@ -3062,7 +3062,8 @@ sub scan_texinfo_file
 {
   my ($filename) = @_;
 
-  my $texi = new Automake::XFile "< $filename";
+  my $source = -e $filename ? $filename : "/dev/null";
+  my $texi = new Automake::XFile "< $source";
   verb "reading $filename";
 
   my ($outfile, $vfile);

if this is the only thing you need, then i won't think any harder about it.
-mike

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