How to generate a MicroPython QSTR from a C macro?

[pablogventura]

I'm using MicroPython and I would like to generate a QSTR that contains the contents of a macro. For example, I have the following macro:

#define MY_MACRO "hello"

How can I generate a QSTR that has the value "hello" and is called MP_QSTR_MY_MACRO?

When I use MP_QSTR_MY_MACRO, that QSTR contains "MY_MACRO" instead of "hello".

[dlech]

Just use MP_QSTR_hello without #defineing it.

There is a tool that automatically creates this macro based on the pattern MP_QSTR_(\w+).

[pablogventura]

Thanks for your answer! Unfortunately my problem is that the macro I need to use to generate the QSTR is generated at compile time, in the manner of __USER__.

[dlech]

Then you should be able to create a generated file with lines like:

Q(hello)

and add that file to QSTR_DEFS in your specific Makefile.

The STM32 port has something like this already, e.g. for generating pin names from a config file (i.e. search for QSTR_DEFS += qstrdefsport.h $(QSTR_GENERATED_HEADERS)).

[pablogventura]

Thank you for your response! Unfortunately the problem continues. In particular I have a macro that returns the git branch (GIT_BRANCH). If I generate the QSTR with Q(GIT_BRANCH) it generates QDEF(MP_QSTR_git_branch, 59348, 10, "git_branch"). So it does not work for me.

I would need to be able to declare a QSTR whose name is static, but its value comes from a macro at compile time.

[dlech]

Does it actually have to be a QSTR? MicroPython uses MP_DEFINE_STR_OBJ instead for things like the git tag.