bug#73159: 30.0.90; uniscribe / harfbuzz are not initialized on Windows, resulting in fallback to gdi

[Eli Zaretskii <eliz@gnu.org>]

> From: Casey Banner <kcbanner@gmail.com>
> Date: Tue, 10 Sep 2024 01:50:43 -0400
> 
> I did a procmon dump to see what .pdmp files emacs.exe is trying to load, and it attempts these locations:
> 
> - E:\dev\emacs-src\bin\emacs.pdmp
> -
> E:\dev\emacs-src\libexec\emacs\30.0.50\x86_64-w64-mingw32\emacs-ef314e5e05618ae9e98f9cccc0769b2adce721d1b3bac00e305e61b4d457b0a4.pdmp
> 
> - E:\dev\emacs-src\libexec\emacs\30.0.50\x86_64-w64-mingw32\emacs.pdmp
> 
> The thing is, the emacs version is 30.0.90, not 30.0.50.
> 
> A strings dump of emacs.exe:
> 
> strings emacs.exe | grep 30.0
> %emacs_dir%/libexec/emacs/30.0.50/x86_64-w64-mingw32
> $Id: GNU Emacs 30.0.90 (x86_64-w64-mingw32 ACL GIF GMP GNUTLS HARFBUZZ JPEG LCMS2 LIBXML2
> MODULES NATIVE_COMP NOTIFY W32NOTIFY PDUMPER PNG RSVG SOUND SQLITE3 THREADS TIFF
> TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XPM ZLIB) $
> 30.0.90
> %emacs_dir%/share/emacs/30.0.90/lisp
> %emacs_dir%/share/emacs/30.0.90/site-lisp;%emacs_dir%/share/emacs/site-lisp
> /30.0.90/lisp/
> %emacs_dir%/share/emacs/30.0.90/etc
> %emacs_dir%/libexec/emacs/30.0.90/x86_64-w64-mingw32
> %emacs_dir%/libexec/emacs/30.0.50/x86_64-w64-mingw32
> 
> So it seems something is going wrong with setting the path. I noticed that exec/configure.ac has:
> 
> AC_INIT([libexec], [30.0.50], [bug-gnu-emacs@gnu.org], [],
>   [https://www.gnu.org/software/emacs/])

exec/configure.ac is not used in the MinGW build (but the above is a
bug nonetheless, so I will fix it shortly).

I cannot reproduce this result:

> strings emacs.exe | grep 30.0
> %emacs_dir%/libexec/emacs/30.0.50/x86_64-w64-mingw32

Please look at src/epaths.h and see how PATH_EXEC is defined there.

> I tried changing this to 30.0.90 and re-building (using make bootstrap), but the resulting binary still has 30.0.50
> in it.

As expected: the MinGW build doesn't use that file.  You should
regenerate or update src/epaths.h.  Perhaps touch src/epaths.in and
then re-run "make" in the top-level directory of the source tree.