Warn about CM tiny and kernel

Author: pravinjagtap

clang/lib/Driver/ToolChains/Clang.cpp

@@ -5767,10 +5767,17 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     } else if (Triple.getArch() == llvm::Triple::x86_64) {
       Ok = llvm::is_contained({"small", "kernel", "medium", "large", "tiny"},
                               CM);
-    } else if (Triple.isNVPTX() || Triple.isAMDGPU()) {
-      // NVPTX/AMDGPU does not care about the code model and will accept
+    } else if (Triple.isNVPTX()) {
+      // NVPTX does not care about the code model and will accept
       // whatever works for the host.
       Ok = true;
+    } else if (Triple.isAMDGPU()) {
+      // AMDGPU does not care about the code model.
+      Ok = true;
+      // AMDGPU target does not accept CM tiny and kernel.
+      if (CM == "tiny" || CM == "kernel") {
+        D.Diag(diag::warn_ignored_clang_option) << A->getSpelling() << CM << TripleStr;
+      }
     }
     if (Ok) {
       CmdArgs.push_back(Args.MakeArgString("-mcmodel=" + CM));

clang/test/Driver/mcmodel.c

@@ -15,9 +15,9 @@
 // RUN: not %clang -### -c --target=aarch64 -mcmodel=medium %s 2>&1 | FileCheck --check-prefix=ERR-MEDIUM %s
 // RUN: not %clang -### -c --target=aarch64 -mcmodel=kernel %s 2>&1 | FileCheck --check-prefix=ERR-KERNEL %s
 // RUN: not %clang --target=aarch64_32-linux -### -S -mcmodel=small %s 2>&1 | FileCheck --check-prefix=ERR-AARCH64_32 %s
-// RUN: %clang --offload-arch=gfx906 -nogpulib -### -c -x hip -mcmodel=tiny %s 2>&1 | FileCheck --check-prefix=AMDGPU-MCMODEL-TINY %s
+// RUN: %clang --offload-arch=gfx906 -nogpulib -### -c -x hip -mcmodel=tiny %s 2>&1 | FileCheck --check-prefix=AMDGPU-MCMODEL-TINY-WARNING %s
 // RUN: %clang --offload-arch=gfx906 -nogpulib -### -c -x hip -mcmodel=small %s 2>&1 | FileCheck --check-prefix=AMDGPU-MCMODEL-SMALL %s
-// RUN: %clang --offload-arch=gfx906 -nogpulib -### -S -x hip -mcmodel=kernel %s 2>&1 | FileCheck --check-prefix=AMDGPU-MCMODEL-KERNEL %s
+// RUN: %clang --offload-arch=gfx906 -nogpulib -### -S -x hip -mcmodel=kernel %s 2>&1 | FileCheck --check-prefix=AMDGPU-MCMODEL-KERNEL-WARNING %s
 // RUN: %clang --offload-arch=gfx906 -nogpulib -### -c -x hip -mcmodel=medium %s 2>&1 | FileCheck --check-prefix=AMDGPU-MCMODEL-MEDIUM %s
 // RUN: %clang --offload-arch=gfx906 -nogpulib -### -S -x hip -mcmodel=large %s 2>&1 | FileCheck --check-prefix=AMDGPU-MCMODEL-LARGE %s
 
@@ -36,8 +36,8 @@
 
 // AARCH64-PIC-LARGE: error: invalid argument '-mcmodel=large' only allowed with '-fno-pic'
 // ERR-AARCH64_32: error: unsupported argument 'small' to option '-mcmodel=' for target 'aarch64_32-unknown-linux'
-// AMDGPU-MCMODEL-TINY: "-mcmodel=tiny"
+// AMDGPU-MCMODEL-TINY-WARNING: warning: the flag '-mcmodel=' has been deprecated and will be ignored
 // AMDGPU-MCMODEL-SMALL: "-mcmodel=small"
-// AMDGPU-MCMODEL-KERNEL: "-mcmodel=kernel"
+// AMDGPU-MCMODEL-KERNEL-WARNING: warning: the flag '-mcmodel=' has been deprecated and will be ignored
 // AMDGPU-MCMODEL-MEDIUM: "-mcmodel=medium"
 // AMDGPU-MCMODEL-LARGE: "-mcmodel=large"