Fix Windows CMake path handling.

The CMake module path was not being handled correctly on Windows because
backslashes were not escaped. This change explicitly replaces backslashes
with forward slashes for the `CMAKE_MODULE_PATH` argument when building on
Windows.

Author: euclid-skyline

build-logic/src/main/java/com/android/ndk/samples/buildlogic/AndroidApplicationConventionPlugin.kt

@@ -5,6 +5,7 @@ import com.android.build.api.dsl.ApplicationExtension
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.kotlin.dsl.configure
+import java.lang.System.getProperty
 
 class AndroidApplicationConventionPlugin : Plugin<Project> {
     override fun apply(target: Project) {
@@ -30,7 +31,14 @@ class AndroidApplicationConventionPlugin : Plugin<Project> {
                     externalNativeBuild {
                         cmake {
                             arguments.add("-DANDROID_SUPPORT_FLEXIBLE_PAGE_SIZES=ON")
-                            arguments.add("-DCMAKE_MODULE_PATH=${rootDir.resolve("cmake")}")
+                            // Determine if the OS is Windows
+                            val isWindows = getProperty("os.name").lowercase().contains("win")
+                            val cmakeModulePath = if (isWindows) {
+                                rootDir.resolve("cmake").toString().replace('\\', '/')
+                            } else {
+                                rootDir.resolve("cmake").toString()
+                            }
+                            arguments.add("-DCMAKE_MODULE_PATH=$cmakeModulePath")
                         }
                     }
 

build-logic/src/main/java/com/android/ndk/samples/buildlogic/AndroidLibraryConventionPlugin.kt

@@ -4,6 +4,7 @@ import com.android.build.api.dsl.LibraryExtension
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.kotlin.dsl.configure
+import java.lang.System.getProperty
 
 class AndroidLibraryConventionPlugin : Plugin<Project> {
     override fun apply(target: Project) {
@@ -33,7 +34,14 @@ class AndroidLibraryConventionPlugin : Plugin<Project> {
                     externalNativeBuild {
                         cmake {
                             arguments.add("-DANDROID_SUPPORT_FLEXIBLE_PAGE_SIZES=ON")
-                            arguments.add("-DCMAKE_MODULE_PATH=${rootDir.resolve("cmake")}")
+                            // Determine if the OS is Windows
+                            val isWindows = getProperty("os.name").lowercase().contains("win")
+                            val cmakeModulePath = if (isWindows) {
+                                rootDir.resolve("cmake").toString().replace('\\', '/')
+                            } else {
+                                rootDir.resolve("cmake").toString()
+                            }
+                            arguments.add("-DCMAKE_MODULE_PATH=$cmakeModulePath")
                         }
                     }
                     ndk {