f9e67a8980
A module is marked unavailable for platform when 1) it does not have
"//apex_available:platform" in its apex_available property, or 2)
it depends on another module that is unavailable for platform.
In that case, LOCAL_NOT_AVAILABLE_FOR_PLATFORM is set to true for the
module in the Make world. Later, that flag is used to ensure that there
is no module with the flag is installed to the device.
The reason why this isn't entirely done in Soong is because Soong
doesn't know if a module will be installed to the device or not. To
explain this, let's have an example.
cc_test { name: "mytest", static_libs: ["libfoo"]}
cc_library_static { name: "libfoo", static_libs: ["libbar"]}
cc_library { name: "libbar", apex_available: ["com.android.xxx"]}
Here, libbar is not available for platform, but is used by libfoo which
is available for platform (apex_available defaults to
"//apex_available:platform"). libfoo is again depended on by mytest
which again is available for platform. The use of libbar should be
allowed in the context of test; we don't want to make libbar available
to platform just for the dependency from test because it will allow
non-test uses of the library as well.
Soong by itself can't tell whether libfoo and libbar are used only in the
context of a test. There could be another module depending them, e.g.,
cc_library_shared { name: "mylib", static_libs: ["libfoo"] }
can exist and it might be installed to the device, in which case
we really should trigger an error.
Since Make has the knowledge of what's installed and what's not,
the check should be done there.
Bug: 153073816
Test: m
Change-Id: I14ddf0e5700d0a7bf60e4e41536efbd26ab5ed3d
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|---|---|---|
| common | ||
| core | ||
| packaging | ||
| target | ||
| tests | ||
| tools | ||
| .gitignore | ||
| Changes.md | ||
| CleanSpec.mk | ||
| Deprecation.md | ||
| OWNERS | ||
| README.md | ||
| Usage.txt | ||
| buildspec.mk.default | ||
| envsetup.sh | ||
| help.sh | ||
| navbar.md | ||
| rbesetup.sh | ||
| tapasHelp.sh | ||
README.md
Android Make Build System
This is the Makefile-based portion of the Android Build System.
For documentation on how to run a build, see Usage.txt
For a list of behavioral changes useful for Android.mk writers see Changes.md
For an outdated reference on Android.mk files, see build-system.html. Our Android.mk files look similar, but are entirely different from the Android.mk files used by the NDK build system. When searching for documentation elsewhere, ensure that it is for the platform build system -- most are not.
This Makefile-based system is in the process of being replaced with Soong, a new build system written in Go. During the transition, all of these makefiles are read by Kati, and generate a ninja file instead of being executed directly. That's combined with a ninja file read by Soong so that the build graph of the two systems can be combined and run as one.