Add ability to customize the CMake generator

When using the CMake class with MinGW it automatically use the “MinGW Makefiles” generator. However, when using MSys and “MinGW Makefiles”, CMake complains when it finds sh.exe in the PATH. A solution is to remove sh.exe but for some of my builds I need to have sh.exe so, in the test_package, I’m forced to override the default behavior of the CMake class as following:

if os_info.is_windows and self.settings.compiler == "gcc":
    self.run('cmake "%s" %s -G "Unix Makefiles"' % (self.conanfile_directory, cmake.command_line))
else:
    self.run('cmake "%s" %s' % (self.conanfile_directory, cmake.command_line))

It ends as the following call:

cmake "path/to/source" -G "MinGW Makefiles" ... -G "Unix Makefiles"

It’s not really clean and I think it would be better if there was an option in the CMake class to choose the CMake generator.

What do you think?

[memsharded]

Ok, I see the point. What would be the suggested interface?

def build(self):
    cmake = CMake(self.settings)
    if platform.system() == "Windows":
        cmake.generator = "Unix Makefiles"
    ...

[lasote]

It’s ok for me. just remember to update the docs to see how to do it.