PIC18FxxQ43 , XC8 , ( Curiosity Nano )

[granddad]

Just sharing a bug I found in the MC XC8 2.32. also 2.40 .
Symptoms .. PIC18F57Q43 code complied but with many errors and warnings . check the #include <xc.h> line. [ The PORTE didn't work ]
Fix.. the plib file was missing from the XC8 directory, I took a guess and copied and renamed the lib file into the 2.40 include directory as plib . Code compiles now without the ‘red weed ‘of errors. ( fix is right picture ) .
( I'm running linux.mint 20 . MPLABX 6.0)

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[tumbleweed]

so where does xc.h get its device info from , must be the IDE config .. but with my project, xc.h failing to locate the .inc file X still complied...

Yes, it gets the device from the IDE project settings which is then passed to XC8 as a command-line parameter.

As stated, if it compiles then "xc.h" isn't failing to find the .inc file, only the IDE.
The IDE has a different idea of what the search paths are than the ones the compiler uses.
What the IDE thinks doesn't matter.