Preprocessor definitions are not set.

[asankacoder]

I am trying to use asio in conan build setup. https://github.com/conan-io/conan-center-index/tree/master/recipes/asio/all

its conanfile.py has this

def package_info(self):
        self.cpp_info.defines.append('ASIO_STANDALONE')
        if str(self.settings.os) in ["Linux", "Android"]:
            self.cpp_info.libs.append('pthread')

When I add asio as an dependecy in my conanfile.py, the generated conanbuildinfo.cmake has these,

set(CONAN_DEFINES "-DASIO_STANDALONE" ${CONAN_DEFINES})
..............
..............
add_compile_options(${CONAN_DEFINES}
                        "$<$<CONFIG:Debug>:${CONAN_DEFINES_DEBUG}>"
                        "$<$<CONFIG:Release>:${CONAN_DEFINES_RELEASE}>"
                        "$<$<CONFIG:RelWithDebInfo>:${CONAN_DEFINES_RELWITHDEBINFO}>"
                        "$<$<CONFIG:MinSizeRel>:${CONAN_DEFINES_MINSIZEREL}>")

But ASIO_STANDALONE is not defined in the project. I think the correct CMAKE function for defining compiler definitions is add_definitions.

Am I missing something here? or asio is not setting up definitions correctly?

[czoido]

Hi @asankacoder, Thanks for your feedback. The main reason for using that instead of add_definitions in Conan is that there's the possibility to do something like this in the recipes:

self.cpp_info.debug.defines.append('DEFINITION_DEBUG')
self.cpp_info.release.defines.append('DEFINITION_RELEASE')

So, for resolving that you need generator expressions that you can have in add_compile_options. Are you having issues because of this?