futogergely added a comment.

"It seems like none of these projects actually use the annex K functions, which 
is not really a surprise.
VLC and lighttpd seems to use it. @futogergely could you please run your check 
on those projects?"

**lighttpd**: the checker issued 386 warnings. The reason is that 
__STDC_WANT_LIB_EXT1__ is defined in a header which is included everywhere. 
However, functions from Annex K are used only in one source file.
**VLC**: 2 warnings, usage of the rewind function.

Both of these projects can be compiled without Annex K as well, which makes the 
code cumbersome. Maybe this check can be really useful in a project where Annex 
K is a must.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D91000/new/

https://reviews.llvm.org/D91000

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