[Clang codegen][PPC] Produce AIX-specific "target features" only for AIX (#130864)

Listing AIX-specific "target features" in the IR are a source of
confusion on PPC Linux. Generate them only for AIX (at least by
default).

Author: hubert-reinterpretcast

clang/lib/Basic/Targets/PPC.cpp

@@ -609,13 +609,15 @@ bool PPCTargetInfo::initFeatureMap(
   // Privileged instructions are off by default.
   Features["privileged"] = false;
 
-  // The code generated by the -maix-small-local-[exec|dynamic]-tls option is
-  // turned off by default.
-  Features["aix-small-local-exec-tls"] = false;
-  Features["aix-small-local-dynamic-tls"] = false;
+  if (getTriple().isOSAIX()) {
+    // The code generated by the -maix-small-local-[exec|dynamic]-tls option is
+    // turned off by default.
+    Features["aix-small-local-exec-tls"] = false;
+    Features["aix-small-local-dynamic-tls"] = false;
 
-  // Turn off TLS model opt by default.
-  Features["aix-shared-lib-tls-model-opt"] = false;
+    // Turn off TLS model opt by default.
+    Features["aix-shared-lib-tls-model-opt"] = false;
+  }
 
   Features["spe"] = llvm::StringSwitch<bool>(CPU)
                         .Case("8548", true)

clang/test/Driver/aix-shared-lib-tls-model-opt.c

@@ -0,0 +1,28 @@
+// RUN: %clang -target powerpc64-unknown-aix -S -emit-llvm %s -o - | FileCheck --check-prefixes=CHECK-AIX,CHECK-AIX-OFF %s
+// RUN: %clang -target powerpc-unknown-aix -S -emit-llvm %s -o - | FileCheck --check-prefixes=CHECK-AIX,CHECK-AIX-OFF %s
+// RUN: %clang -target powerpc64le-unknown-linux-gnu -S -emit-llvm %s -o - | FileCheck --check-prefix=CHECK-LINUX %s
+// RUN: %clang -target powerpc64-unknown-linux-gnu -S -emit-llvm %s -o - | FileCheck --check-prefix=CHECK-LINUX %s
+
+// RUN: %clang -target powerpc64-unknown-aix -maix-shared-lib-tls-model-opt -S -emit-llvm \
+// RUN:    %s -o - | FileCheck %s --check-prefixes=CHECK-AIX,CHECK-AIX-ON
+
+// FIXME: Clang driver diagnostic not implemented.
+// RUN: true || not %clang -target powerpc-unknown-aix -maix-shared-lib-tls-model-opt \
+// RUN:    -fsyntax-only %s 2>&1 | FileCheck --check-prefix=CHECK-UNSUPPORTED-TARGET %s
+// RUN: true || not %clang -target powerpc64le-unknown-linux-gnu -maix-shared-lib-tls-model-opt \
+// RUN:    -fsyntax-only %s 2>&1 | FileCheck --check-prefix=CHECK-UNSUPPORTED-TARGET %s
+// RUN: true || not %clang -target powerpc64-unknown-linux-gnu -maix-shared-lib-tls-model-opt \
+// RUN:    -fsyntax-only %s 2>&1 | FileCheck --check-prefix=CHECK-UNSUPPORTED-TARGET %s
+
+int test(void) {
+  return 0;
+}
+
+// CHECK-AIX: test() #0 {
+// CHECK-AIX: attributes #0 = {
+// CHECK-AIX-OFF-SAME: -aix-shared-lib-tls-model-opt
+// CHECK-AIX-ON-SAME: +aix-shared-lib-tls-model-opt
+
+// CHECK-LINUX-NOT: {{[-+]aix-shared-lib-tls-model-opt}}
+
+// CHECK-UNSUPPORTED-TARGET: option '-maix-shared-lib-tls-model-opt' cannot be specified on this target

clang/test/Driver/aix-small-local-exec-dynamic-tls.c

@@ -1,7 +1,7 @@
-// RUN: %clang -target powerpc64-unknown-aix -S -emit-llvm %s -o - | FileCheck %s
-// RUN: %clang -target powerpc-unknown-aix -S -emit-llvm %s -o - | FileCheck %s
-// RUN: %clang -target powerpc64le-unknown-linux-gnu -S -emit-llvm %s -o - | FileCheck %s
-// RUN: %clang -target powerpc64-unknown-linux-gnu -S -emit-llvm %s -o - | FileCheck %s
+// RUN: %clang -target powerpc64-unknown-aix -S -emit-llvm %s -o - | FileCheck --check-prefix=CHECK-AIX-DEFAULT %s
+// RUN: %clang -target powerpc-unknown-aix -S -emit-llvm %s -o - | FileCheck --check-prefix=CHECK-AIX-DEFAULT %s
+// RUN: %clang -target powerpc64le-unknown-linux-gnu -S -emit-llvm %s -o - | FileCheck --check-prefix=CHECK-LINUX %s
+// RUN: %clang -target powerpc64-unknown-linux-gnu -S -emit-llvm %s -o - | FileCheck --check-prefix=CHECK-LINUX %s
 
 // RUN: %clang -target powerpc64-unknown-aix -maix-small-local-exec-tls -S -emit-llvm \
 // RUN:    %s -o - | FileCheck %s --check-prefix=CHECK-AIX_SMALL_LOCALEXEC_TLS
@@ -39,9 +39,10 @@ int test(void) {
   return 0;
 }
 
-// CHECK: test() #0 {
-// CHECK: attributes #0 = {
-// CHECK-SAME: {{-aix-small-local-exec-tls,.*-aix-small-local-dynamic-tls|-aix-small-local-dynamic-tls,.*-aix-small-local-exec-tls}}
+// CHECK-AIX-DEFAULT: test() #0 {
+// CHECK-AIX-DEFAULT: attributes #0 = {
+// CHECK-AIX-DEFAULT-SAME: {{-aix-small-local-exec-tls,.*-aix-small-local-dynamic-tls|-aix-small-local-dynamic-tls,.*-aix-small-local-exec-tls}}
+// CHECK-LINUX-NOT: {{[-+]aix-small-local-exec-tls,.*[-+]aix-small-local-dynamic-tls|[-+]aix-small-local-dynamic-tls,.*[-+]aix-small-local-exec-tls}}
 
 // CHECK-UNSUPPORTED-AIX32: option '-maix-small-local-[exec|dynamic]-tls' cannot be specified on this target
 // CHECK-UNSUPPORTED-LINUX: option '-maix-small-local-[exec|dynamic]-tls' cannot be specified on this target