Make ignorewarnings optional in optimize
This allows targets to opt-in to running R8 without the -ignorewarnings
flag. Ignored warnings can cause code to be optimized incorrectly, so
this makes the build safer for such targets.
Ideally ignore_warnings should default to false, but all targets need to
be fixed for that to happen. As a first step, provide a mechanism for
individual targets to ensure they do not introduce regressions.
Bug: 229727645
Bug: 180878971
Bug: 226127213
Bug: 239990030
Test: m (runs dex_test)
Change-Id: Ic0eef29598c1ee47e958da8a5048d9696165a235
diff --git a/java/dex.go b/java/dex.go
index c943938..a44d792 100644
--- a/java/dex.go
+++ b/java/dex.go
@@ -42,6 +42,9 @@
// True if the module containing this has it set by default.
EnabledByDefault bool `blueprint:"mutated"`
+ // Whether to continue building even if warnings are emitted. Defaults to true.
+ Ignore_warnings *bool
+
// If true, runs R8 in Proguard compatibility mode (default).
// Otherwise, runs R8 in full mode.
Proguard_compatibility *bool
@@ -293,7 +296,10 @@
}
// TODO(b/180878971): missing classes should be added to the relevant builds.
- r8Flags = append(r8Flags, "-ignorewarnings")
+ // TODO(b/229727645): do not use true as default for Android platform builds.
+ if proptools.BoolDefault(opt.Ignore_warnings, true) {
+ r8Flags = append(r8Flags, "-ignorewarnings")
+ }
return r8Flags, r8Deps
}
diff --git a/java/dex_test.go b/java/dex_test.go
index fbdccb6..a3e2ded 100644
--- a/java/dex_test.go
+++ b/java/dex_test.go
@@ -59,6 +59,36 @@
appR8.Args["r8Flags"], libHeader.String())
android.AssertStringDoesNotContain(t, "expected no static_lib header jar in app javac classpath",
appR8.Args["r8Flags"], staticLibHeader.String())
+ android.AssertStringDoesContain(t, "expected -ignorewarnings in app r8 flags",
+ appR8.Args["r8Flags"], "-ignorewarnings")
+}
+
+func TestR8Flags(t *testing.T) {
+ result := PrepareForTestWithJavaDefaultModulesWithoutFakeDex2oatd.RunTestWithBp(t, `
+ android_app {
+ name: "app",
+ srcs: ["foo.java"],
+ platform_apis: true,
+ optimize: {
+ shrink: false,
+ optimize: false,
+ obfuscate: false,
+ ignore_warnings: false,
+ },
+ }
+ `)
+
+ app := result.ModuleForTests("app", "android_common")
+ appR8 := app.Rule("r8")
+ android.AssertStringDoesContain(t, "expected -dontshrink in app r8 flags",
+ appR8.Args["r8Flags"], "-dontshrink")
+ android.AssertStringDoesContain(t, "expected -dontoptimize in app r8 flags",
+ appR8.Args["r8Flags"], "-dontoptimize")
+ android.AssertStringDoesContain(t, "expected -dontobfuscate in app r8 flags",
+ appR8.Args["r8Flags"], "-dontobfuscate")
+ android.AssertStringDoesNotContain(t, "expected no -ignorewarnings in app r8 flags",
+ appR8.Args["r8Flags"], "-ignorewarnings")
+
}
func TestD8(t *testing.T) {