possible to turn off "variable never used" for ext

[akohlsmith]

I've got a project with three source files, and an include file that has the #fuses and #use lines and so on, as recommended by the manual. I also place all my externs and function prototypes in the include file.

Not all externs are used by all source files, and the compiler is throwing a warning about the unused variables.

Other compilers are smarter than this (only throwing a warning for unused variables declared in functions) and I'm wondering if something similar can be achieved with PICC?

[temtronic]

yes, you can(should be able to) turn off any of the warnings,by adding -nnn where nnn is the number that corresponds to the 'warning' to the compiler options.

if that doesn't work, _smart_ programmers don't add unused variables in their code.

[dyeatman]

Also look at #ignore_warnings on page 112 of the current CCS manual
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[akohlsmith]

[Ttelmah]

I think you are missing a fundamental point.

CCS, is at heart a 'single pass' compiler. It now has an _option_ to link, but does not use a separate linker as such.

Now, what you are doing, is classic for a link/compiler setup, but will cause warnings with CCS, since here the compiler itself parses the extern declaration, as meaning 'this module uses this variable defined externally'. Different from a linker, where this is parsed as 'if and when you need it the declaration of this component is here'.

You can avoid the problem by writing your code with this in mind. Have each primary code component declare a #define so (for example) in a.c, have a #define BEING_COMPILED_BY_A

Then in foo.h, have the extern declarations made dependant on who is loading the code, only declaring the variables that are used in the required section.

Best Wishes

[akohlsmith]