Fix Android Studio JDK 21 / Rust issues (#898)

Works around gradle/gradle#10483 by resolving the compiler paths at the start of the script, then passing them where they’re needed.

Author: jkmassel

native/kotlin/api/android/build.gradle.kts

@@ -86,6 +86,8 @@ dependencies {
 val cargoProjectRoot = rootProject.ext.get("cargoProjectRoot")!!
 val moduleName = "wp_api"
 cargo {
+    cargoCommand = rootProject.ext.get("cargoBinaryPath").toString()
+    rustcCommand = rootProject.ext.get("rustcBinaryPath").toString()
     module = "$cargoProjectRoot/$moduleName/"
     libname = moduleName
     profile = "release"

native/kotlin/api/kotlin/build.gradle.kts

@@ -93,7 +93,7 @@ val generateUniFFIBindingsTask = tasks.register<Exec>("generateUniFFIBindings")
     dependsOn(rootProject.tasks.named("cargoBuildLibraryRelease"))
     workingDir(project.rootDir)
     commandLine(
-        "cargo",
+        rootProject.ext.get("cargoBinaryPath")!!,
         "run",
         "--release",
         "--bin",

native/kotlin/build.gradle.kts

@@ -47,12 +47,17 @@ allprojects {
     }
 }
 
+val cargoBinaryPath = resolveBinary("cargo")
+val rustcBinaryPath = resolveBinary("rustc")
 val cargoProjectRoot = "${project.rootDir}/../.."
 val jniLibsPath = "${layout.buildDirectory.get()}/jniLibs/"
 val generatedTestResourcesPath = "${layout.buildDirectory.get()}/generatedTestResources/"
 val rustModuleName = "wp_api"
 val nativeLibraryPath =
     "$cargoProjectRoot/target/release/lib${rustModuleName}${getNativeLibraryExtension()}"
+
+rootProject.ext.set("cargoBinaryPath", cargoBinaryPath)
+rootProject.ext.set("rustcBinaryPath", rustcBinaryPath)
 rootProject.ext.set("cargoProjectRoot", cargoProjectRoot)
 rootProject.ext.set("jniLibsPath", jniLibsPath)
 rootProject.ext.set("generatedTestResourcesPath", generatedTestResourcesPath)
@@ -68,7 +73,7 @@ fun setupJniAndBindings() {
 
     val cargoBuildLibraryReleaseTask = tasks.register<Exec>("cargoBuildLibraryRelease") {
         workingDir(rootProject.ext.get("cargoProjectRoot")!!)
-        commandLine("cargo", "build", "--package", rustModuleName, "--release")
+        commandLine(cargoBinaryPath, "build", "--package", rustModuleName, "--release")
         // No inputs.dir added, because we want to always re-run this task and let Cargo handle caching
     }
 
@@ -101,6 +106,16 @@ fun setupJniAndBindings() {
     }
 }
 
+fun resolveBinary(name: String): String {
+    val process = ProcessBuilder().apply {
+        command(listOf("which", name))
+    }.start()
+
+    process.waitFor()
+
+    return process.inputReader().readText().trim()
+}
+
 fun getNativeLibraryExtension(): String {
     val currentOS = org.gradle.internal.os.OperatingSystem.current()
     return if (currentOS.isLinux) {