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[wasm] [docs] Improve build flags information

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Simon Cozens 2023-05-18 07:14:28 +01:00
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docs/wasm-shaper.md
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@ -370,9 +370,22 @@ Produces a debugging message in the host shaper's log output; the variants `debu
## Enabling the WASM shaper when building Harfbuzz
First, you will need the `wasm-micro-runtime` library installed on your computer. Download `wasm-micro-runtime` from [its GitHub repository](https://github.com/bytecodealliance/wasm-micro-runtime/tree/main); then follow [the instructions for building](https://github.com/bytecodealliance/wasm-micro-runtime/blob/main/product-mini/README.md) (you may want to enable "fast JIT"), followed by a `make install`.
First, you will need the `wasm-micro-runtime` library installed on your computer. Download `wasm-micro-runtime` from [its GitHub repository](https://github.com/bytecodealliance/wasm-micro-runtime/tree/main); then follow [the instructions for building](https://github.com/bytecodealliance/wasm-micro-runtime/blob/main/product-mini/README.md), except add the `-DWAMR_BUILD_REF_TYPES=1` flag to the `cmake` line. (You may want to enable "fast JIT".) Follow this with a `make install`.
To enable the WASM shaper, add the string `-Dwasm=enabled` to your meson build line. For example:
So, for example:
```
$ cd product-mini/platforms/darwin
$ mkdir build
$ cd build
$ cmake .. -DWAMR_BUILD_REF_TYPES=1 -DWAMR_BUILD_FAST_JIT=1
$ make
$ make install
```
(If you don't want to install `wasm-micro-runtime` globally, you can copy `libiwasm.*` and `libvmlib.a` into a directory that your compiler can see when building Harfbuzz.)
Once `wasm-micro-runtime` is installed, to enable the WASM shaper, you need to add the string `-Dwasm=enabled` to your meson build line. For example:
```
$ meson setup build -Dwasm=enabled