Hi,
I’m trying to build a universal binary on macOS using multiplexing. This works
mostly fine but I’m running into an issue when it comes to building a
third-party library that uses another build system.
I have a rule which calls this build system and specifies the output artifacts
that are produced.
Here’s a simple example that reproduces the setup. The rule just calls clang as
a command to simulate the external build system:
Product {
type: "dynamiclibrary"
name: "A"
multiplexByQbsProperties: ["architectures"]
aggregate: true
Depends { name: "cpp" }
Rule {
multiplex: true
requiresInputs: false
Artifact {
filePath: "testout"
fileTags: ["dynamiclibrary"]
}
prepare: {
console.error("ARCHITECTURE: " + product.qbs.architecture);
var cmd = new Command("clang++", ["test.cpp", "-o", output.fileName,
"--shared", "-arch", product.qbs.architecture]);
cmd.description = "Running test command";
cmd.workingDirectory = product.destinationDirectory;
return [cmd];
}
}
}
The output of the build is the following (I’m using console.error because
console.log doesn’t show up?):
…
ERROR: ARCHITECTURE: arm64
Running test command [A {“architecture”:”arm64”}]
ERROR: ARCHITECTURE: x86_64
Running test command [A {“architecture”:”x86_64”}]
ERROR: ARCHITECTURE: arm64
Running test command [A]
lipo libA.dylib
…
As you can see here, the rule is executed three times. This makes sense of
course because it is run for each architecture and then once more for the
aggregate step.
The issue I’m having now is that for the aggregate step I don’t want to run the
build command again. So I would have to somehow check if the current run is the
aggregate and just return an empty command array.
The question now is: How do I check that?
According to the multiplexing documentation at
https://qbs.io/docs/multiplexing/ the multiplexed property (here
product.qbs.architecture) should be undefined for the aggregate step so I
should be able to use that to return early.
But as you can tell from the output above, it is not undefined but ‘arm64’.
Is this a bug or is the documentation not up to date and there’s a different
way to do this?
Regards
Leon
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