bug#29931: 27.0.50; Slightly suboptimal build behavior on macOS

[Philipp Stephani <p.stephani2@gmail.com>]

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Alan Third <alan@idiocy.org> schrieb am Mo., 1. Jan. 2018 um 15:59 Uhr:

> On Mon, Jan 01, 2018 at 01:15:09PM +0100, Philipp wrote:
> >
> > There are a few small bugs when building on macOS and not passing the
> > right configure options.
> >
> > 1. When running configure without options, the build fails with an error
> >
> > xml.c:26:10: fatal error: 'libxml/tree.h' file not found
> > #include <libxml/tree.h>
> >          ^~~~~~~~~~~~~~~
> >
> > Apparently configure detects libxml2 to be present, but doesn't set the
> > correct include path.
>
> This works fine here. Is it possible this was introduced by macOS
> 10.13?
>
> Do you see the file in /usr/include/libxml2/libxml/?
>

No, /usr/include doesn't exist at all on my system. The include directory
is
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include.


>
> > 2. When building with --without-libxml2, the build succeeds, but gives
> > warnings like
> >
> >   GEN      ../../info/auth.info
> > ./../emacs/docstyle.texi:3: warning: unrecognized encoding name `UTF-8'.
> >
> > This is because macOS ships an ancient version of makeinfo (4.8).  It's
> > possible to install a newer version using Homebrew, but that's not in
> > PATH and therefore not found.  Maybe configure could also search for
> > makeinfo in the Homebrew directory (/usr/local/opt/texinfo/bin)?
>
> I’d think it’s the user’s responsibility to make sure /usr/local/bin
> is on their path if they want to use homebrew stuff?
>
>
/usr/local/bin doesn't contain makeinfo when installed via Homebrew. This
is intentional; `brew info texinfo` says

==> *Caveats*

This formula is keg-only, which means it was not symlinked into /usr/local,

because software that uses TeX, such as lilypond and octave, require a newer

version of these files.


If you need to have this software first in your PATH run:
  echo 'export PATH="/usr/local/opt/texinfo/bin:$PATH"' >> ~/.bash_profile

I can obviously do that or set MAKEINFO explicitly when invoking configure,
but it would be nice if configure detected this situation automatically.

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