Make clang report invalid target versions.

clang/include/clang/Basic/DiagnosticDriverKinds.td

@@ -786,4 +786,7 @@ def warn_android_unversioned_fallback : Warning<
   " directories will not be used in Clang 19. Provide a versioned directory"
   " for the target version or lower instead.">,
   InGroup<DiagGroup<"android-unversioned-fallback">>;
+
+def err_android_version_invalid : Error<
+  "Version %0 in triple %1-%2-%3-%4 is invalid.">;
 }

clang/lib/Driver/Driver.cpp

@@ -1430,6 +1430,20 @@ Compilation *Driver::BuildCompilation(ArrayRef<const char *> ArgList) {
   const ToolChain &TC = getToolChain(
       *UArgs, computeTargetTriple(*this, TargetTriple, *UArgs));
 
+  if (TC.getTriple().isAndroid()) {
+    llvm::Triple Triple = TC.getTriple();
+    unsigned TripleVersion = Triple.getEnvironmentVersion().getMajor();
+    StringRef TripleVersionName = Triple.getEnvironmentVersionString();
+
+    if (TripleVersion == 0 && TripleVersionName != "") {
+      Diags.Report(diag::err_android_version_invalid)
+          << TripleVersionName << Triple.getArchName()
+          << Triple.getVendorName() << Triple.getOSName()
+          << Triple.getEnvironmentTypeName(Triple.getEnvironment());
+      ContainsError = true;
+    }
+  }
+
   // Report warning when arm64EC option is overridden by specified target
   if ((TC.getTriple().getArch() != llvm::Triple::aarch64 ||
        TC.getTriple().getSubArch() != llvm::Triple::AArch64SubArch_arm64ec) &&

clang/test/CodeGen/aarch64-fix-cortex-a53-835769.c

@@ -5,13 +5,13 @@
 // RUN: %clang -O3 -target aarch64-linux-eabi -mno-fix-cortex-a53-835769 %s -S -o- 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-NO --check-prefix=CHECK %s
 
-// RUN: %clang -O3 -target aarch64-android-eabi %s -S -o- \
+// RUN: %clang -O3 -target aarch64-linux-androideabi %s -S -o- \
 // RUN:   | FileCheck --check-prefix=CHECK-YES --check-prefix=CHECK %s
 // RUN: %clang -O3 -target aarch64-linux-ohos %s -S -o- \
 // RUN:   | FileCheck --check-prefix=CHECK-YES --check-prefix=CHECK %s
-// RUN: %clang -O3 -target aarch64-android-eabi -mfix-cortex-a53-835769 %s -S -o- \
+// RUN: %clang -O3 -target aarch64-linux-androideabi -mfix-cortex-a53-835769 %s -S -o- \
 // RUN:   | FileCheck --check-prefix=CHECK-YES --check-prefix=CHECK %s
-// RUN: %clang -O3 -target aarch64-android-eabi -mno-fix-cortex-a53-835769 %s -S -o- \
+// RUN: %clang -O3 -target aarch64-linux-androideabi -mno-fix-cortex-a53-835769 %s -S -o- \
 // RUN:   | FileCheck --check-prefix=CHECK-NO --check-prefix=CHECK %s
 
 // REQUIRES: aarch64-registered-target

clang/test/Driver/aarch64-fix-cortex-a53-835769.c

@@ -5,7 +5,7 @@
 // RUN: %clang --target=aarch64-linux-eabi -mno-fix-cortex-a53-835769 %s -### 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-NO %s
 
-// RUN: %clang --target=aarch64-android-eabi %s -### 2>&1 \
+// RUN: %clang --target=aarch64-linux-androideabi %s -### 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-YES %s
 
 // RUN: %clang --target=aarch64-fuchsia %s -### 2>&1 \

clang/test/Driver/android-version.cpp

@@ -0,0 +1,16 @@
+// Check that we get the right Android version.
+
+// RUN: not %clang -target aarch64-linux-androidS -c %s -### 2>&1 | \
+// RUN:   FileCheck --check-prefix=CHECK-ERROR %s
+
+// CHECK-ERROR: error: Version S in triple aarch64-unknown-linux-android is invalid.
+
+// RUN: not %clang -target armv7-linux-androideabiS -c %s -### 2>&1 | \
+// RUN:   FileCheck --check-prefix=CHECK-ERROR1 %s
+
+// CHECK-ERROR1: error: Version S in triple armv7-unknown-linux-android is invalid.
+
+// RUN: %clang -target aarch64-linux-android31 -c %s -### 2>&1 | \
+// RUN:   FileCheck --check-prefix=CHECK-TARGET %s
+
+// CHECK-TARGET: "aarch64-unknown-linux-android31"

llvm/include/llvm/TargetParser/Triple.h

@@ -434,6 +434,12 @@ class Triple {
   /// string (separated by a '-' if the environment component is present).
   StringRef getOSAndEnvironmentName() const;
 
+  /// Get the version component of the environment component as a single
+  /// string (the version after the environment).
+  ///
+  /// For example, "fooos1.2.3" would return "1.2.3".
+  StringRef getEnvironmentVersionString() const;
+
   /// @}
   /// @name Convenience Predicates
   /// @{

llvm/lib/TargetParser/Triple.cpp

@@ -1206,11 +1206,14 @@ static VersionTuple parseVersionFromName(StringRef Name) {
 }
 
 VersionTuple Triple::getEnvironmentVersion() const {
+  return parseVersionFromName(getEnvironmentVersionString());
+}
+
+StringRef Triple::getEnvironmentVersionString() const {
   StringRef EnvironmentName = getEnvironmentName();
   StringRef EnvironmentTypeName = getEnvironmentTypeName(getEnvironment());
   EnvironmentName.consume_front(EnvironmentTypeName);
-
-  return parseVersionFromName(EnvironmentName);
+  return EnvironmentName;
 }
 
 VersionTuple Triple::getOSVersion() const {