Replace warnings with errors

[AlexeyTsvetkov]

Some Gradle configuration flags and Gradle DSL options become incompatible with Compose Multiplatform 1.5.0.

1. Kotlin/Native cache kind explicitly set to "none"

By default, enabling/disabling the compiler caches for Kotlin/Native is now handled by Compose Multiplatform Gradle plugin. Manually disabling the cache raises a warning. The caches are disabled by the following flags in gradle.properties or local.properties:

• kotlin.native.cacheKind=none;
• kotlin.native.cacheKind.<IOS_TARGET_PRESET>=none;

What can you do?

• 🟢 We recommend to remove kotlin.native.cacheKind=none from gradle.properties or local.properties.
• ⚠️ If you are sure the flags are necessary, the automatic flag management and the error can be turned off by adding compose.kotlin.native.manageCacheKind=false to gradle.properties.

Detailed description

Disabling the compiler caches is usually not necessary because it significantly slows down incremental builds.
However, prior to Kotlin/Native 1.9.0, the compiler often could not compile Compose code with the cache.
This has led to widespread use of cacheKind=none throughout many Compose Multiplatform projects.

The root issue is partially fixed in Kotlin 1.9.0, and will be fixed completely in a future release.
Compose Multiplatform Gradle plugin can now manage the necessary caching flags by itself based on a Kotlin/Native version being used. So once the underlying issue in Kotlin/Native compiler is fixed, the plugin will enable caching automatically.

2. CocoaPods resource configuration

⚠️ This section is only relevant for users of the Compose Multiplatform experimental resources library.
Users of third party libraries (such as Moko Resources or libres) should not be affected by this.

Now, explicitly setting the extra spec resources attribute is prohibited:

kotlin {
    cocoapods {
        // ...
        extraSpecAttributes["resources"] = "['src/commonMain/resources/**', 'src/iosMain/resources/**']"
    }
}

What can you do?

• 🟢 We recommend to remove extraSpecAttributes["resources"] from build scripts:

kotlin {
    cocoapods {
        // The following line should be removed!
        extraSpecAttributes["resources"] = "['src/commonMain/resources/**', 'src/iosMain/resources/**']"
    }
}

• ⚠️ Alternatively, the automatic resource management can be disabled by adding the following line to gradle.properties:

compose.ios.resources.sync=false

Detailed description

For more information about resource management improvements, see the description of the corresponding PR.

[igordmn]

compose.kotlin.native.manageCacheKind

Should we rename it to "org.jetbrains.compose.kotlin.native.manageCacheKind"? To be consistent with the other property

[igordmn]

Let's wait Dima for the second approval.

I will cherry-pick it to release/1.5.0 after merging.

[dima-avdeev-jb]

All fine, Approve!