feature: added non-api feature that would

allo non-api items to be part of the
generated bindings. These bindings
are not cached.

Cargo.toml

@@ -28,7 +28,11 @@ default = ["runtime"]
 # Turn on the 'use-bindgen' feature to generate bindings on the fly for your platform.
 use-bindgen = ["bindgen", "clang"]
 
+# retain non-API bindings from R (requires build-time generation of bindings)
+non-api = ["use-bindgen"]
+
 runtime = ["clang/runtime", "bindgen/runtime"]
+
 # Enables generation of layout-tests in bindgen
 layout_tests = ["use-bindgen"]
 

build.rs

@@ -377,7 +377,7 @@ fn set_r_version_vars(ver: &RVersionInfo) {
     println!("cargo:r_version_devel={}", ver.devel); // Becomes DEP_R_R_VERSION_DEVEL for clients
 }
 
-#[cfg(feature = "use-bindgen")]
+#[cfg(all(feature = "use-bindgen", not(feature = "non-api")))]
 fn get_non_api() -> std::collections::HashSet<String> {
     // Several non-APIs are required for extendr-engine, so we explicitly allow
     // these here. If extendr-engine (or other crate) requires more non-APIs,
@@ -392,8 +392,7 @@ fn get_non_api() -> std::collections::HashSet<String> {
     ];
 
     // nonAPI.txt is generated by
-    //
-    //     Rscript -e 'cat(tools:::nonAPI, "\n")' | uniq | sort
+    // Rscript -e 'cat(tools:::nonAPI, sep = "\n")' | tr -d '\r' | sort -u | tee ./nonAPI.txt
     let non_api = include_str!("./nonAPI.txt")
         .lines()
         .filter(|e| !REQUIRED_NON_API.contains(e))
@@ -402,6 +401,11 @@ fn get_non_api() -> std::collections::HashSet<String> {
     std::collections::HashSet::from_iter(non_api)
 }
 
+#[cfg(all(feature = "use-bindgen", feature = "non-api"))]
+fn get_non_api() -> std::collections::HashSet<String> {
+    Default::default()
+}
+
 #[cfg(feature = "use-bindgen")]
 /// Generate bindings by calling bindgen.
 fn generate_bindings(r_paths: &InstallationPaths, version_info: &RVersionInfo) {