error of "libLLVM_host" depends on undefined module "libLLVM_darwin" reported

[Yongqin Liu]

Hi, All

With the latest AOSP master source, if I repo init with '-darwin' group excluded on my Ubuntu host,

then I will got my following errors reported:

FAILED: out/soong/build.ninja
out/soong/.bootstrap/bin/soong_build -t -l out/.module_paths/Android.bp.list -b out/soong -n out -d out/soong/build.ninja.d -globFile out/soong/.bootstrap/build-globs.ninja -o out/soong/build.ninja Android.bp
error: prebuilts/clang/host/linux-x86/Android.bp:585:1: "libLLVM_host" depends on undefined module "libLLVM_darwin"
error: prebuilts/clang/host/linux-x86/Android.bp:619:1: "libc++abi_host" depends on undefined module "libc++abi_darwin"
error: prebuilts/clang/host/linux-x86/Android.bp:595:1: "libclang_cxx_host" depends on undefined module "libclang_cxx_darwin"
error: prebuilts/clang/host/linux-x86/Android.bp:605:1: "libc++_host" depends on undefined module "libc++_darwin"
ninja: build stopped: subcommand failed.
23:14:17 soong bootstrap failed with: exit status 1

I found that libLLVM_darwin module is defined in project of prebuilts/clang/host/darwin-x86/,

but does those modules defined in prebuilts/clang/host/linux-x86 really depends on the modules defined in prebuilts/clang/host/darwin-x86?

and it worked before(one week ago?) without  prebuilts/clang/host/darwin-x86 repo synced.

Could  anyone please help to check on that?

Thanks,

Yongqin Liu

[Dan Willemsen]

We don't maintain the -darwin group -- in general, if you have a manifest that hasn't been carefully stripped down, you may need to specify ALLOW_MISSING_DEPENDENCIES=true, but that may only push the error until later in the build process (and won't work in this case).

In this case, it looks like the change in behavior was due to this soong change: https://android-review.googlesource.com/c/platform/build/soong/+/920955 (the parent change is the implementation). We're now adding dependencies to all the referenced modules, even if they're in target: { darwin: { ... } } blocks that will never be used in the current build. While that can be a good thing (you're less likely to cause an instant build failure on Mac due to a typo), it is a problem for these types of use cases.

I've filed a public bug to track this: https://issuetracker.google.com/128377112

Thanks for the report,

Dan

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[Yongqin Liu]

On Tue, 12 Mar 2019 at 13:53, 'Dan Willemsen' via Android Building <android-...@googlegroups.com> wrote:

We don't maintain the -darwin group -- in general, if you have a manifest that hasn't been carefully stripped down, you may need to specify ALLOW_MISSING_DEPENDENCIES=true, but that may only push the error until later in the build process (and won't work in this case).

In this case, it looks like the change in behavior was due to this soong change: https://android-review.googlesource.com/c/platform/build/soong/+/920955 (the parent change is the implementation). We're now adding dependencies to all the referenced modules, even if they're in target: { darwin: { ... } } blocks that will never be used in the current build. While that can be a good thing (you're less likely to cause an instant build failure on Mac due to a typo), it is a problem for these types of use cases.

I've filed a public bug to track this: https://issuetracker.google.com/128377112

Thanks for checking on this, will following there.

Best Regards,

Yongqin Liu

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Best Regards,

Yongqin Liu

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