Forum: System Workbench for STM32

STM32 assembly .ifdef not working?

Posted by TheBug on 2018-01-31 16:25

Seems like no matter what I try the .ifdef does not work. It always takes the default path.

This happens with a symbol defined in the make settings as well as with symbols defined in any other way, including .equ and .set

I even tried using a label that I used for memory access a few lines down in the code. Same result, .ifdef used the default path and the memory access worked.

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Posted by dautrevaux on 2018-01-31 18:22 France

Hi,

Could you be a bit more explicit about how the symbol you want to test has been defined? What do you mean by “defined in the make settings”?

Note that a referenced symbol is not a defined symbol: it may assemble correctly, as an undefined symbol that will be resolved by the linker, but is not a defined symbol, as checked by .ifdef

Also the symbol must be defined in the same file, before being tested by .ifdef

Last option, sometimes more natural to C programmers, name your assembler source file with an uppercase S as extension and it will be preprocessed by the C preprocessor, so you could use all the C pre-processor directives (include, ifdef, etc...)

Hope this helps,

Bernard (Ac6)

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Posted by TheBug on 2018-02-01 15:35

Hi Bernard,
thank you, that was exactly the information I was missing.

I changed the files to .S and let the C pre-processor do the job. Now it works.

Primarily I code in assembly, but the project uses the ST libraries for some tasks, so I do have to mix the code.

Greetings
Guido

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