Build & run flatc using cargo to avoid OS package dependencies

  * Use the flatc crate to get a specific flatc version built via
    cargo itself.
  * Remove github action OS package installs

.github/workflows/rust-build.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: awalsh128/cache-apt-pkgs-action@latest
         with:
-          packages: cmake python3-dev swig flatbuffers-compilers
+          packages: cmake python3-dev swig
           version: 1.1
       - uses: actions/checkout@v4
         with:
@@ -25,7 +25,7 @@ jobs:
     steps:
       - uses: awalsh128/cache-apt-pkgs-action@latest
         with:
-          packages: cmake python3-dev swig flatbuffers-compilers
+          packages: cmake python3-dev swig
           version: 1.1
       - uses: actions/checkout@v4
         with:
@@ -39,9 +39,9 @@ jobs:
   build_default_macos:
     runs-on: macos-latest
     steps:
-      - name: Get CMake
-        uses: symbitic/install-cmake@master
-      - uses: aisightgmbh/actions-install-flatc@v1
+      - uses: tecolicom/actions-use-homebrew-tools@v1
+        with:
+          tools: cmake
       - uses: actions/checkout@v4
         with:
           submodules: 'true'
@@ -55,7 +55,7 @@ jobs:
     steps:
       - uses: awalsh128/cache-apt-pkgs-action@latest
         with:
-          packages: cmake python3-dev swig flatbuffers-compilers
+          packages: cmake python3-dev swig
           version: 1.1
       - uses: actions/checkout@v4
         with:

Cargo.toml

@@ -101,8 +101,8 @@ daumtils = { git = "https://github.com/rdaum/daumtils.git", version = "0.2.0" }
 decorum = "0.3" # For ordering & comparing our floats
 encoding_rs = "0.8.34"
 enum-primitive-derive = "0.3"
-flatbuffers = "24.3.25"
-flatc-rust = "0.2.0"
+flatbuffers = "23.5.26"
+flatc = "0.2.2+23.5.26"
 flexbuffers = "2.0.0"
 im = "15.1"
 inventory = "0.3.15"

crates/values/Cargo.toml

@@ -37,4 +37,4 @@ list_impl_buffer = []
 default = []
 
 [build-dependencies]
-flatc-rust.workspace = true
+flatc.workspace = true

crates/values/build.rs

@@ -12,14 +12,33 @@
 // this program. If not, see <https://www.gnu.org/licenses/>.
 //
 
-use std::path::Path;
-
 fn main() {
     println!("cargo:rerun-if-changed=schema/values.fbs");
-    flatc_rust::run(flatc_rust::Args {
-        inputs: &[Path::new("schema/values.fbs")],
-        out_dir: Path::new("../target/flatbuffers/"),
-        ..Default::default()
-    })
-    .expect("flatc");
+
+    // Find the flatc binary.
+    let flatc_path = flatc::flatc();
+
+    // Emit the version # by executing the binary with --version
+    let version = std::process::Command::new(flatc_path)
+        .arg("--version")
+        .output()
+        .expect("failed to get flatc version")
+        .stdout;
+
+    println!(
+        "cargo:warning=Compiling flatbuffers with {}",
+        String::from_utf8(version).unwrap()
+    );
+
+    // Invoke flatc to generate Rust code
+    std::process::Command::new(flatc_path)
+        // Rust output
+        .arg("-r")
+        // My output directory
+        .arg("-o")
+        .arg("../target/flatbuffers/")
+        // My schema
+        .arg("schema/values.fbs")
+        .output()
+        .expect("failed to run flatc");
 }