geany version - 1.29
Most of the function declarations in glibc header files are marked with __THROW. Geany cannot identify or incorrectly identifies these functions. (sample files /usr/include/pthread.h, /usr/include/unistd.h). 
The online parsing does not apply macro substitutions, so macros used to modify the language syntax can confuse it.
For system files like pthread.h or unistd.h it is recommended to make offline global tags using the C pre-processor to generate symbols. (see the manual, and check the wiki to be sure tags havn't already been produced).
You can use [ignore.tags](https://www.geany.org/manual/#c-ignore-tags) to mitigate the issue, it's here for just that.
Closed #1314 via #3032.
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