Make cxx a feature

.github/workflows/ci.yml

@@ -49,10 +49,14 @@ jobs:
             components: clippy
         - uses: Swatinem/[email protected]
 
-        - name: cargo clippy
+        - name: Run clippy
           shell: bash
-          run: |
-            cargo clippy --tests --benches --workspace --examples -- -D warnings
+          run: cargo clippy --tests --benches --workspace --examples -- -D warnings
+          env:
+            RUST_BACKTRACE: 1
+        - name: Run clippy (all features)
+          shell: bash
+          run: cargo clippy --tests --benches --workspace --examples --all-features -- -D warnings
           env:
             RUST_BACKTRACE: 1
 
@@ -81,8 +85,7 @@ jobs:
         - name: Set up Python
           uses: actions/setup-python@v4
         - name: Install codespell
-          run: |
-              python -m pip install codespell
+          run: python -m pip install codespell
         - name: Run codespell
           # Edit this file to tweak the typo list and other configuration.
           run: codespell --config .codespellrc

modeling-cmds/Cargo.toml

@@ -12,7 +12,7 @@ license = "MIT"
 
 [dependencies]
 chrono = "0.4.31"
-cxx = "1.0"
+cxx = { version = "1.0", optional = true }
 data-encoding = "2.5.0"
 diesel = { version = "2.1.1", features = ["serde_json", "mysql", "chrono", "r2d2", "uuid", "numeric"] }
 diesel_derives = "2.1.2"
@@ -31,3 +31,7 @@ uuid = { version = "1.6.1", features = ["serde"] }
 
 [lints]
 workspace = true
+
+[features]
+default = []
+cxx = ["dep:cxx"]

modeling-cmds/src/lib.rs

@@ -12,6 +12,7 @@ pub mod format;
 /// Modeling command IDs, used to associated requests and responses.
 /// Also used to construct commands which refer to previous commands.
 pub mod id;
+#[cfg(feature = "cxx")]
 pub mod impl_extern_type;
 mod impl_traits;
 /// When a modeling command is successful, these responses could be returned.

modeling-cmds/src/shared.rs

@@ -7,7 +7,9 @@ use parse_display_derive::{Display, FromStr};
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 
-use crate::{impl_extern_type, units::UnitAngle};
+#[cfg(feature = "cxx")]
+use crate::impl_extern_type;
+use crate::units::UnitAngle;
 
 // A helper macro for allowing enums of only strings to be saved to the database.
 macro_rules! impl_string_enum_sql {
@@ -726,6 +728,7 @@ impl_string_enum_sql! {FileImportFormat}
 
 // Enum: Connect Rust Enums to Cpp
 // add our native c++ names for our cxx::ExternType implementation
+#[cfg(feature = "cxx")]
 impl_extern_type! {
     [Trivial]
     // File