GeezerVison is showing github.com — font finding in OSX produces 200+ lines of warnings · Issue #28249 · matplotlib/matplotlib
font finding in OSX produces 200+ lines of warnings #28249Description @anntzer, on my macos 10.15.7 Catalina
system_profiler -xml SPFontsDataType 2>&1 # <- def _get_macos_fonts() in mpl 3.9.0
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2024-05-17 11:56:24.964 system_profiler[1061:15889] CoreText note: Client requested name ".AlBayanPUA", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
2024-05-17 11:56:24.964 system_profiler[1061:15889] CoreText note: Set a breakpoint on CTFontLogSystemFontNameRequest to debug.
2024-05-17 11:56:24.968 system_profiler[1061:15889] CoreText note: Client requested name ".AlBayanPUA-Bold", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
2024-05-17 11:56:24.972 system_profiler[1061:15889] CoreText note: Client requested name ".AlNilePUA", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
2024-05-17 11:56:24.975 system_profiler[1061:15889] CoreText note: Client requested name ".AlNilePUA-Bold", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
2024-05-17 11:56:24.978 system_profiler[1061:15889] CoreText note: Client requested name ".AlTarikhPUA", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
2024-05-17 11:56:24.982 system_profiler[1061:15889] CoreText note: Client requested name ".AppleColorEmojiUI", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
2024-05-17 11:56:24.985 system_profiler[1061:15889] CoreText note: Client requested name ".AppleSDGothicNeoI-Regular", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
2024-05-17 11:56:24.988 system_profiler[1061:15889] CoreText note: Client requested name ".AppleSDGothicNeoI-Medium", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
2024-05-17 11:56:24.991 system_profiler[1061:15889] CoreText note: Client requested name ".AppleSDGothicNeoI-Light", it will get Times-Roman rather than the intended font. All system UI font access should be through proper APIs such as CTFontCreateUIFontForLanguage() or +[NSFont systemFontOfSize:].
...
200-odd such lines.
So I reinstalled matplotlib==3.8.4.
Please advise: are there functions in font_manager.py I can call to help debug this
or caches / .jsons I can delete ? Thanks
Originally posted by @denis-bz in #27230 (comment) Activitydenis-bz commented on May 17, 2024 tacaswell commented on May 17, 2024 Do we know it is osx version specific? jklymak commented on May 17, 2024 This does not happen for 14.x (Sonoma). Catalina is quite old - not sure when the difference would have come in. denis-bz commented on May 18, 2024 edit Sunday 19 May:
Folks,
until this is reproduced on other Macos versions, I'd drop it to low low priority --
better things to do than try to decipher these murky error messages (I got nowhere).
A workaround that works for me is to just ignore stderr in
font_manager.py _get_macos_fonts, instead of check_output --
@lru_cache
def _get_macos_fonts():
p = subprocess.Popen( "system_profiler -xml SPFontsDataType" .split(),
stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, text=False )
d, = plistlib.loads( p.stdout.read() ) # not load( p.stdout )
items = [Path(entry["path"]) for entry in d["_items"]]
# print( "▄ bp _get_macos_fonts", len(items) ); breakpoint()
return items
anntzer commented on May 20, 2024 Unfortunately I can't repro this on any of the macos versions present on GHA (which start at macos11). I suspect that the practical solution is indeed to silently ignore errors from system_profiler, at least when stdout is valid xml (i.e. we can assume that we'll still get a useful list of fonts from it). denis-bz commented on Jun 12, 2026 @tacaswell, folks,
pip install matplotlib to 3.11.0 seems to have hidden SPFontsDataType
so that system_profiler -xml SPFontsDataType spits out 200 lines of warnings like the above
(which I don't understand).
Worse, back to pip install matplotlib==3.10.9 doesn't help;
rm -r ~/Library/Caches doesn't help. Can a macos-font expert help me ?
_get_macos_fonts in the two font_manager.py look the same.
(This is on the same old mac 10.15, which I realize is endoflife ...)
Thanks, cheers iccir commented on Jun 27, 2026 @denis-bz - To be clear, if you run system_profile in Terminal on the 10.15 machine, you are getting the 200 lines of warnings? If so, the problem is internal to the system_profile utility and is something that Apple fixed in macOS 11 and later.
This message originates from TDescriptorSource::CopyFontDescriptorPerPostScriptName in the CoreText framework. If TDescriptorSource::ShouldSubstituteInvisibleFontName returns true, CTFontLogSystemFontNameRequest() is called and the logs print. There's a flag that suppresses this behavior, which is likely what Apple started using on macOS 11 to prevent the output.
For 10.15, I don't think there's anything that can be done other than filter out lines with "CoreText note" from stderr. iccir commented on Jun 27, 2026 After installing macOS 10.15 Catalina and reversing the CoreText, SPFontReporter, and UIFoundation binaries, I don't think that there's any way to avoid this error. The only way is to filter out the lines that contain "CoreText note".
In 10.15, -[SPFontReporter infoForDescriptor:] always calls +[NSFont fontWithName:size:], which will always print this log message by design.
In 11.0, Apple added a check to see if the font is private (starts with a .). If true, they no longer call into +[NSFont fontWithName:size:].
Binary Ninja output from 11.0's SPFontReporter binary
denis-bz commented on Jul 2, 2026 @iccir, thanks for going through these twisty passages; IOU a beverage of your choice 🍺
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