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bug#51480: lib(png|gif|jpeg)-version not defined
From: |
Eli Zaretskii |
Subject: |
bug#51480: lib(png|gif|jpeg)-version not defined |
Date: |
Fri, 29 Oct 2021 17:12:07 +0300 |
> From: Stefan Kangas <stefan@marxist.se>
> Date: Fri, 29 Oct 2021 06:54:59 -0700
>
> In image.c, I see the following:
>
> DEFSYM (Qlibpng_version, "libpng-version");
> Fset (Qlibpng_version,
> #if HAVE_PNG
> make_fixnum (PNG_LIBPNG_VER)
> #else
> make_fixnum (-1)
> #endif
> );
> DEFSYM (Qlibgif_version, "libgif-version");
> Fset (Qlibgif_version,
> #ifdef HAVE_GIF
> make_fixnum (GIFLIB_MAJOR * 10000
> + GIFLIB_MINOR * 100
> + GIFLIB_RELEASE)
> #else
> make_fixnum (-1)
> #endif
> );
> DEFSYM (Qlibjpeg_version, "libjpeg-version");
> Fset (Qlibjpeg_version,
> #if HAVE_JPEG
> make_fixnum (JPEG_LIB_VERSION)
> #else
> make_fixnum (-1)
> #endif
> );
> #endif
>
> But AFAICT, this doesn't really do anything? I can't find those
> variables, the only one I have is `libgnutls-version'. So should those
> definitions be DEFVAR's, or am I missing something?
They are only defined on MS-Windows, because they are needed for
loading the correct DLL. See w32-win.el.