Optional feature to enable bevy/dynamic_linking in crates/benilla-app (#853)

- Add bevy/dynamic_linking feature forward for benilla-app for faster dev builds
- bevy_dynamic_linking says the binary starts only through cargo run

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Sam <samuv.eth@gmail.com>

Cargo.lock

@@ -696,6 +696,7 @@ version = "0.18.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fd310426290cec560221f9750c2f4484be4a8eeea7de3483c423329b465c40e"
 dependencies = [
+ "bevy_dylib",
  "bevy_internal",
  "tracing",
 ]
@@ -1015,6 +1016,15 @@ dependencies = [
  "sysinfo",
 ]
 
+[[package]]
+name = "bevy_dylib"
+version = "0.18.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f142f72bbbc1a61338bf6da5dc7cf6dcf223683b9d53bcd635ebff4bfeb5308f"
+dependencies = [
+ "bevy_internal",
+]
+
 [[package]]
 name = "bevy_ecs"
 version = "0.18.1"

crates/benilla-app/Cargo.toml

@@ -16,6 +16,9 @@ dev = ["benilla-assets/dev", "benilla-formats/dev", "benilla-world/dev", "dep:be
 tracy = ["bevy/trace_tracy"]
 # Writes every system's per-run span to `trace-<ts>.json` in the cwd.
 trace_chrome = ["bevy/trace_chrome"]
+# Links Bevy as a shared library so an incremental rebuild relinks faster. The binary then starts
+# only through `cargo run`, which puts the toolchain's libstd on the loader path.
+bevy_dynamic_linking = ["bevy/dynamic_linking"]
 
 [dependencies]
 anyhow.workspace = true

crates/benilla/Cargo.toml

@@ -15,6 +15,8 @@ dev = ["benilla-app/dev"]
 # Profiling switches, forwarded so `cargo run -p benilla --features tracy` works.
 tracy = ["benilla-app/tracy"]
 trace_chrome = ["benilla-app/trace_chrome"]
+# Forwards to benilla-app's `bevy_dynamic_linking`, which enables bevy/dynamic_linking.
+bevy_dynamic_linking = ["benilla-app/bevy_dynamic_linking"]
 
 [dependencies]
 # `default-features = false`, or `--no-default-features` here still builds benilla-app with `dev`.