Resolves symlinks against <dir prefix="relative">

When a config file is symlinked and obtaining an relative path from it for <dir>,
it behaved like:

$ realpath /path/to/foo.conf
/path/to/realpath/foo.conf
$ FONTCONFIG_FILE=/path/to/foo.conf fc-cache -v
Font directories:
        /path/to/fonts
/path/to/fonts: skipping, existing cache is valid: 1 fonts, 0 dirs
/path/to/cachedir: cleaning cache directory
fc-cache: succeeded

And after this change:

$ FONTCONFIG_FILE=/path/to/foo.conf fc-cache -v
Font directories:
        /path/to/relpath/fonts
/path/to/realpath/fonts: skipping, existing cache is valid: 1 fonts, 0 dirs
/path/to/cachedir: cleaning cache directory
fc-cache: succeeded

Fixes https://gitlab.freedesktop.org/fontconfig/fontconfig/-/issues/290

1 files changed, 3 insertions, 0 deletions

diff --git a/src/fcint.h b/src/fcint.h
index f7141c1..d6d44b0 100644
--- a/src/fcint.h
+++ b/src/fcint.h
@@ -1346,6 +1346,9 @@ FcPrivate FcChar32
 FcStrHashIgnoreBlanksAndCase (const FcChar8 *s);
 
 FcPrivate FcChar8 *
+FcStrRealPath (const FcChar8 *path);
+
+FcPrivate FcChar8 *
 FcStrCanonFilename (const FcChar8 *s);
 
 FcPrivate FcBool