[question] ability to call cppstd helpers in conan.tools.build within a package_id() method

[jcar87]

What is your question?

example use case

from conan.tools.build import valid_max_cppstd

def package_id():
    if self.info.settings.get_safe("compiler.cppstd") and not valid_max_cppstd(self, "14"):
        self.info.settings.compiler.cppstd = "14"

def generate():
        cppstd = self.settings.get_safe("compiler.cppstd")
        if cppstd and not valid_max_cppstd(self, "14"):
            tc.cache_variables["CMAKE_CXX_STANDARD"] = "14"

This fails because the implementation of valid_max_cppstd() accessses self.settings which is not allowed within a package_id()

Have you read the CONTRIBUTING guide?

• I've read the CONTRIBUTING guide

[valgur]

YES, PLEASE. This is quite a headache when trying to re-use the same checks in package_id and elsewhere. self.settings and self.options should not be modifiable in package_id(), but it would be great to be able to do read-only access to these values as mentioned in the issue.

Doing valid_max_cppstd(self.info, "14") can be used in the above snippet as a workaround, though.