conanfile options and None

[fittyCent]

None seems to come in as a string 'None' when default_options is involved. In the folllowing conanfile, issue-line is satisfied and the contents of the if-statement is executed even when my profile file doesn't contain options.configuration. If i change that line to if self.options.configuration != 'None', it works as expected (not going into the if-statement if configuration is None).

My conanfile.py

class SetupConan(ConanFile):
    name = 'foo'
    version = '0.1.0'
    settings = 'arch', 'os', 'build_type', 'compiler'
    options = {'configuration': 'ANY' }
    default_options = {'configuration': None}

    def requirements(self):
        self.requires('libcurl/7.83.1')

    def generate(self):
        ms = MSBuildDeps(self)
        if self.options.configuration is not None:   # <---- issue-line: also doesn't work with != None
            ms.configuration = self.options.configuration
        ms.generate()

    def layout(self):
        self.folders.generators = 'conan'

Environment Details (include every applicable attribute)

• windows 10
• msvs 2019
• 1.49
• 3.10.5

[memsharded]

If you want to allow None (not defined, please better write the option as options = {"configuration": [None, "ANY"]}

[fittyCent]

Did this and the execution still went into the if statement:

class SetupConan(ConanFile):
    name = 'foo'
    version = '0.1.0'
    settings = 'arch', 'os', 'build_type', 'compiler'
    options = {'configuration': [ None, 'ANY' ]}
    default_options = {'configuration': None}

    def requirements(self):
        self.requires('libcurl/7.83.1')

    def generate(self):
        ms = MSBuildDeps(self)
        if self.options.configuration is not None:   # <---- issue-line: also doesn't work with != None
            ms.configuration = self.options.configuration
        ms.generate()

    def layout(self):
        self.folders.generators = 'conan'

The conan_libcurl.props file shows this when ran against a profile that doesn't contain options (only contains settings):

<Import Condition="'$(Configuration)' == 'None' And '$(Platform)' == 'x64'" Project="conan_libcurl_none_x64.props"/>

[memsharded]

Have you tried with if self.options.configuration:? The options object has some magic in it to allow the dynamic attributtes, but that also means that sometimes it cannot be treated as pure Python objects as is not None.

[fittyCent]

if self.options.configuration: worked.

One note is if I did options = {'configuration': [ None, 'ANY' ]}, I could only set configuration, the ANY option doesn't work because it would only allow 'None' or 'ANY' strings as options.

So to get this all working the way I need to:

• options = {'configuration': 'ANY' }
• if self.options.configuration:

[memsharded]

good point @fittyCent

This was my mistake. There was an issue with exactly this, that has been recently fixed in #11449, and will be in next 1.50 release.