Add GdextBuild::{before_api, since_api}; fix itest depending on compiled rather than runtime version

Author: Bromeon

godot-codegen/src/central_generator.rs

@@ -516,6 +516,32 @@ fn make_build_config(header: &Header) -> TokenStream {
                 };
                 (version.major as u8, version.minor as u8, version.patch as u8)
             }
+
+            /// For a string "4.x", returns `true` if the current Godot version is strictly less than 4.x.
+            ///
+            /// Runtime equivalent of `#[cfg(before_api = "4.x")]`.
+            ///
+            /// # Panics
+            /// On bad input.
+            pub fn before_api(major_minor: &str) -> bool {
+                let mut parts = major_minor.split('.');
+                let queried_major = parts.next().unwrap().parse::<u8>().expect("invalid major version");
+                let queried_minor = parts.next().unwrap().parse::<u8>().expect("invalid minor version");
+                assert_eq!(queried_major, 4, "major version must be 4");
+
+                let (_, minor, _) = Self::godot_runtime_version_triple();
+                minor < queried_minor
+            }
+
+            /// For a string "4.x", returns `true` if the current Godot version is equal or greater to 4.x.
+            ///
+            /// Runtime equivalent of `#[cfg(since_api = "4.x")]`.
+            ///
+            /// # Panics
+            /// On bad input.
+            pub fn since_api(major_minor: &str) -> bool {
+                !Self::before_api(major_minor)
+            }
         }
     }
 }

godot-core/src/init/mod.rs

@@ -8,6 +8,8 @@ use godot_ffi as sys;
 
 use std::cell;
 
+pub use sys::GdextBuild;
+
 #[doc(hidden)]
 // TODO consider body safe despite unsafe function, and explicitly mark unsafe {} locations
 pub unsafe fn __gdext_load_library<E: ExtensionLibrary>(

itest/rust/src/builtin_tests/containers/dictionary_test.rs

@@ -8,6 +8,7 @@ use std::collections::{HashMap, HashSet};
 
 use godot::builtin::meta::{FromGodot, ToGodot};
 use godot::builtin::{dict, varray, Dictionary, Variant};
+use godot::sys::GdextBuild;
 
 use crate::framework::{expect_panic, itest};
 
@@ -354,10 +355,11 @@ fn dictionary_equal() {
     assert_ne!(dict! {"foo": "bar"}, dict! {"bar": "foo"});
 
     // Changed in https://github.com/godotengine/godot/pull/74588.
-    #[cfg(before_api = "4.2")]
-    assert_eq!(dict! {1: f32::NAN}, dict! {1: f32::NAN});
-    #[cfg(since_api = "4.2")]
-    assert_ne!(dict! {1: f32::NAN}, dict! {1: f32::NAN});
+    if GdextBuild::before_api("4.2") {
+        assert_eq!(dict! {1: f32::NAN}, dict! {1: f32::NAN});
+    } else {
+        assert_ne!(dict! {1: f32::NAN}, dict! {1: f32::NAN});
+    }
 }
 
 #[itest]