Remove the ffi-headers feature

Rely on a separate cbindgen instance instead, which is less self-contained but more practical.

.github/workflows/ci.yml

@@ -59,7 +59,9 @@ jobs:
       # Need to rebuild the FFI wrapper so that its binary is given a filename
       # without a hash.
       - name: Build FFI wrapper
-        run: cargo build --manifest-path ffi/Cargo.toml --features ffi-headers
+        run: |
+          cargo build --manifest-path ffi/Cargo.toml
+          cbindgen ffi/ -o ffi/include/loot_condition_interpreter.h
 
       # Use bash because PowerShell doesn't fail if one command fails.
       - name: Build and run C++ tests
@@ -120,7 +122,9 @@ jobs:
       # Need to rebuild the FFI wrapper so that its binary is given a filename
       # without a hash.
       - name: Build FFI wrapper
-        run: cargo build --manifest-path ffi/Cargo.toml --features ffi-headers
+        run: |
+          cargo build --manifest-path ffi/Cargo.toml
+          cbindgen ffi/ -o ffi/include/loot_condition_interpreter.h
 
       # Use bash because PowerShell doesn't fail if one command fails.
       - name: Build and run C++ tests

README.md

@@ -27,16 +27,7 @@ To build the Rust and C FFI libraries, run:
 cargo build --release --package loot-condition-interpreter-ffi
 ```
 
-To generate a C++ header file as part of the build, instead run:
-
-```
-cargo build --release --package loot-condition-interpreter-ffi --all-features
-```
-
-This will create a file at `ffi/include/loot_condition_interpreter.h`.
-However, this involves building [cbindgen](https://github.com/eqrion/cbindgen)
-as a dependency, which is relatively slow. If you have cbindgen installed
-separately, it's faster to generate the headers using its CLI:
+Use [cbindgen](https://github.com/eqrion/cbindgen) to generate a C++ header file:
 
 ```
 cbindgen ffi/ -o ffi/include/loot_condition_interpreter.h

ffi/Cargo.toml

@@ -3,7 +3,6 @@ name = "loot-condition-interpreter-ffi"
 version = "3.1.0"
 authors = ["Oliver Hamlet <[email protected]>"]
 license = "MIT"
-build = "build.rs"
 edition = "2018"
 
 [dependencies]
@@ -13,10 +12,3 @@ libc = "0.2"
 [lib]
 name = "loot_condition_interpreter_ffi"
 crate-type = ["staticlib"]
-
-[features]
-default = []
-ffi-headers = ["cbindgen"]
-
-[build-dependencies]
-cbindgen = { version = "0.26", optional = true }