What the warning?

 What the warning?

I have this code

IAP_STATUS_CODE software_update_procedure(int8_t const *ap_folder_entry)

which calls

if (strncasecmp(ap_folder_entry + 8, IMAGES_NAME_EXTENSION, strlen(IMAGES_NAME_EXTENSION) ) == 0)

while

extern _ARMABI int strncasecmp(const char * /*s1*/, const char * /*s2*/, size_t /*n*/) __attribute__((__nonnull__(1,2)));

which generates this warning:

src\software_update.c(16): warning:  #167-D: argument of type "const int8_t *" is incompatible with parameter of type "const char *"

but the type int8_t is defined like this

typedef   signed          char int8_t;

checking "Plain Char is Signed" does not help.

 RE: What the warning?

Yes. So what?

Plain 'char' is a type distinct from both signed char and unsigned char. Even if plain char is signed, it's not the same as signed char.

As far as pointers to each are concerned, that renders them incompatible.