Bug 1372368

Summary:	freetype-2.6.5 and freetype-2.6.3 are ABI incompatible
Product:	[Fedora] Fedora	Reporter:	Ralf Corsepius <rc040203>
Component:	freetype	Assignee:	Marek Kašík <mkasik>
Status:	CLOSED WONTFIX	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	25	CC:	behdad, fonts-bugs, kevin, mkasik
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Last Closed:	2017-08-17 09:06:24 UTC	Type:	Bug
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Bug Blocks:	1372348

Description Ralf Corsepius 2016-09-01 14:05:13 UTC

Description of problem:

With freetype-2.6.5, some freetype-internal functions, which were publicly accessible before were made inaccessible, 

e.g. FT_New_GlyphSlot, FT_Done_GlyphSlot

Due to the fact the SONAME was not changed and no mass-rebuild performed for fc25, this change at least broke Inventor (Inventor uses FT_Done_GlyphSlot).
I haven't tried to check and therefore don't know if this affects more packages.

fc25 ships an fc24-built Inventor which now contains a reference to an unresolvable symbol which used to be provided by freetype.

Version-Release number of selected component (if applicable):
freetype-2.6.5

Additional info:
- Inventor clearly is at fault to use private functions from freetype, but it had been this way for more than ca. 15 years.

- IMHO, it's arguable whether freetype's SONAME should have been changed.
libfreetype.so.6.12.3 and libfreetype.so.6.12.5 definitely are ABI incompatible.

- It's not clear to me, why freetype made FT_Done_GlyphSlot inaccessible, but left other similar functions public.

- ATM, I do not see an alternative but to "steal" FT_Done_GlyphSlot code from freetype and to incorporate it into Inventor, to work-around Inventor's problem on fedora >= 25.

Comment 1 Marek Kašík 2016-09-05 16:05:03 UTC

It was this commit which turned off export of the functions:

http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/ChangeLog?id=771d3c8ae25d5042a3f6b76a329ad3dd782eca66

I've grepped through all the ~800 packages we have in Fedora 25 which depends on libfreetype.so* and I've found that only the Inventor calls an internal function of freetype (the FT_Done_GlyphSlot()).

I'm proposing to not bump the SONAME because of this and close this bug as wontfix, do you agree?