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 16:54 Uhr:

> On Mon, Jan 01, 2018 at 03:12:57PM +0000, Philipp Stephani wrote:
> > Philipp Stephani <p.stephani2@gmail.com> schrieb am Mo., 1. Jan. 2018 um
> > 16:05 Uhr:
> >
> > > 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.
> > >
> >
> > `xcode-select --install` does add a /usr/include directory. If
> > `xcode-select --install` is necessary for building Emacs, should
> configure
> > error out if it hasn't been run?
> > However, all other parts of the build process seem to work fine without
> > `xcode-select --install`.
>
> Can you please run
>
>     xcrun --show-sdk-path
>
> And see if it returns something useful? On my machine it returns
> nothing at all, but I don’t have the full xcode installed.
>
>
It prints the correct directory:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk
That is, `xcrun --show-sdk-path`/usr/include/libxml2 contains the required
header files.

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