tag | 2dd75088fca8df489ae61e464cc432d3cc04b9c1 | |
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tagger | The Android Open Source Project <initial-contribution@android.com> | Thu Feb 18 09:59:28 2021 -0800 |
object | d84d7d07bd801c98522bed1c7aabc7b89b8d664f |
Android S Preview 1
commit | d84d7d07bd801c98522bed1c7aabc7b89b8d664f | [log] [tgz] |
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author | Steven Moreland <smoreland@google.com> | Thu Feb 18 00:55:52 2021 +0000 |
committer | Steven Moreland <smoreland@google.com> | Thu Feb 18 01:04:47 2021 +0000 |
tree | f066799f5e469116cb2c036fb2d3ce2643df85e1 | |
parent | 6022c509a2fb66a0c0ac1744037ee8f802fe01df [diff] |
Better error for empty -Ljava-constants If someone accidentally includes gen_java_constants (-Ljava-constants) in their Android.bp file, this used to emit a cryptic error about depfiles since hidl-gen didn't make the expected dir hierarchy). Even if that were fixed, we would have to emit an empty/bare Constants.java file, which isn't so nice (and anyway, -Ljava-constants is not needed at all - it was to work around a frameworks.jar dependency loop which is now fixed via hwbinder.stubs). So now instead of doing nothing, explicitly returning an error. Bug: 180023307 Test: manual Change-Id: I7ddc9e520ccd107d03a6073b94dbc2a44f206e7d
Full documentation can be found here: https://source.android.com/devices/architecture/hidl/
hidl-gen is a compiler for the HIDL (HAL Interface Design Language) which generates C++ and Java endpoints for RPC mechanisms. The main userspace libraries which this compiler uses can be found at system/libhidl.
m hidl-gen
Note that options for hidl-gen expected to be invoked by the build system are marked with ‘internal’ in the help menu.
hidl-gen -h hidl-gen -o output -L c++-impl -r android.hardware:hardware/interfaces -r android.hidl:system/libhidl/transport android.hardware.nfc@1.0
Some defaults for package roots are also provided
hidl-gen -o output -L c++-impl android.hardware.nfc@1.0 hidl-gen -o output -L vts android.hardware.nfc@1.0 hidl-gen -L hash android.hardware.nfc@1.0
Example command for vendor project
hidl-gen -L c++-impl -r vendor.foo:vendor/foo/interfaces vendor.foo.nfc@1.0
See update-makefiles-helper.sh and update-all-google-makefiles.sh for examples of how to generate HIDL makefiles (using the -Landroidbp option).
NOTE: When using the -Landroidbp option, you can force generated modules to be installed in
/system_ext
rather than other partition by putting a marker file.hidl_for_system_ext
alongside*.hal
files.
NOTE: You can also install the vendor variant of the generated modules to be installed in
/odm
rather than/vendor
by putting a marker file.hidl_for_odm
alongside*.hal
files.
This is a helper tool to convert C headers to valid .hal files.
m c2hal && c2hal -h