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no_std support (#232)

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- Disable default features in dependencies
- Use anyhow::Error::msg to map errors. Note: anyhow will itself be removed later.
- lazy_static/spin_no_std used in no_std environments
- ensure_no_std binary is built to target  thumbv7m-none-eabi to ensure that
  there are no std dependencies.  thumbv7m-none-eabi target has no std support.
- The opa-no-std feature enables only those Regorus features that work with no_std.
- Enable tests with no_std
- Update sizes of regorus binary in  README.md
- Ensure that regorus example can be built with only std
- Ensure that regorus example can be built with no_std

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>
This commit is contained in:
Anand Krishnamoorthi
2024-05-13 09:42:35 -04:00
committed by GitHub
parent 01fc234a33
commit e86b590f91
25 changed files with 343 additions and 173 deletions
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8
README.md
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@@ -88,14 +88,14 @@ features. By default all features are enabled.
The default build of regorus example program is 6.4M:
```bash
$ cargo build -r --example regorus; strip target/release/examples/regorus; ls -lh target/release/examples/regorus
-rwxr-xr-x 1 anand staff 6.4M Jan 19 11:23 target/release/examples/regorus*
-rwxr-xr-x 1 anand staff 6.3M May 11 22:03 target/release/examples/regorus*
```
When all features except for `yaml` are disabled, the binary size drops down to 2.9M.
When all default features are disabled, the binary size drops down to 1.9M.
```bash
$ cargo build -r --example regorus --features "yaml" --no-default-features; strip target/release/examples/regorus; ls -lh target/release/examples/regorus
-rwxr-xr-x 1 anand staff 2.9M Jan 19 11:26 target/release/examples/regorus*
$ cargo build -r --example regorus --no-default-features; strip target/release/examples/regorus; ls -lh target/release/examples/regorus
-rwxr-xr-x 1 anand staff 1.9M May 11 22:04 target/release/examples/regorus*
```
Regorus passes the [OPA v0.64.0 test-suite](https://www.openpolicyagent.org/docs/latest/ir/#test-suite) barring a few