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# hidl-gen
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.
## 1. Build
```
m hidl-gen
```
## 2. Run
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.
# c2hal
This is a helper tool to convert C headers to valid .hal files.
```
m c2hal && c2hal -h
```
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