Commits on May 25, 2023

1. Improve wasm32-wasi support …

   [Starting from 3.41.0 SQLite has wasm32-wasi support out of the
   box.][0]
   
   - Set `-DSQLITE_THREADSAFE=0`. Fixes:
   
   ```
   $ wasmtime target/wasm32-wasi/release/examples/persons.wasm
   Error: failed to run main module `target/wasm32-wasi/release/examples/persons.wasm`
   
   Caused by:
       0: failed to instantiate "target/wasm32-wasi/release/examples/persons.wasm"
       1: unknown import: `env::pthread_mutexattr_init` has not been defined
   ```
   
   - Drop `-DSQLITE_OS_OTHER`. Fixes:
   
   ```
   $ wasmtime target/wasm32-wasi/release/examples/persons.wasm
   Error: failed to run main module `target/wasm32-wasi/release/examples/persons.wasm`
   
   Caused by:
       0: failed to instantiate "target/wasm32-wasi/release/examples/persons.wasm"
       1: unknown import: `env::sqlite3_os_init` has not been defined
   ```
   
   - [Add wasi specific build flags][1]
   - Add basic example
   - Also, add instructions how to run it against wasm32-wasi.
   
   Using of file databases is also working, though `--mapdir` arg
   should be provided to `wasmtime run`.
   
   [0]: https://wasmlabs.dev/articles/sqlite-wasi-support/
   [1]: https://github.com/vmware-labs/webassembly-language-runtimes/blob/main/libs/sqlite/wasi-patches/wlr-build.sh#L11

   

   etehtsea committed May 25, 2023
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