c - Is this valid code? extern marked with @ and address, from PIC microcontroller libraries -

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this question has answer here:

i used clang perform analysis on code pic18 microcontroller. gets lots of errors , seem caused lines in headers this.

extern volatile unsigned char ansela @ 0xf38;

i understand doing, mapping symbol register on chip, standard c or microchip extension compilers?

however standard c or microchip extension compilers?

it not standard c common extension used c embedded compilers.

see answer here on specific topic:

@ sign in c variable declaration


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