On 2023-11-30 21:46, Karl Berry wrote:
Hi Dennis,

     libtool: compile: unable to infer tagged configuration

Thanks for the report.

As you surmise, apparently this needs to be reported to
libtool. (Although afaik libtool is currently unmaintained, so I don't
know when or if anything will get fixed.) At least, I have no idea what
to do about, or even work around, that error :(.

This could still be (partially) an Automake issue, since the problem appears partially related to how Automake is calling libtool from the build rules (it is missing the --tag option), and I think those are coming from Automake.

However it looks like there is no tag defined for Objective C[1] (presumably it would be --tag=OBJC). Adding this option does appear to make things "work" in the sense that libtool just complains about the unknown tag but then proceeds to actually do stuff, rather than exiting outright with a fatal error.

Interestingly the libtool manual also says "If [libtool] can't infer a tag, then it defaults to the configuration for the C language", which is clearly not the case (it seems what actually happens is that if libtool can't infer a tag then it exits with a fatal error). So I wonder if
this is actually a regression in libtool.

[1] https://www.gnu.org/software/libtool/manual/libtool.html#Tags

Cheers,
  Nick

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