[mlir][nvvm] Expose MLIR_NVPTXCOMPILER_ENABLED in mlir-config.h.

This is another follow-up of #83004, which made the same change for
`MLIR_CUDA_CONVERSIONS_ENABLED`. As the previous PR, this PR commit
exposes mentioned CMake variable through `mlir-config.h` and uses the
macro that is introduced with the same name. This replaces the macro
`MLIR_NVPTXCOMPILER_ENABLED`, which the CMake files previously defined
manually.

Author: ingomueller-net

mlir/include/mlir/Config/mlir-config.h.cmake

@@ -33,4 +33,7 @@
    and targets. */
 #cmakedefine01 MLIR_ENABLE_CUDA_CONVERSIONS
 
+/* If set, enables features that depend on the NVIDIA's PTX compiler. */
+#cmakedefine01 MLIR_ENABLE_NVPTXCOMPILER
+
 #endif

mlir/lib/Target/LLVM/CMakeLists.txt

@@ -93,7 +93,6 @@ if(MLIR_ENABLE_CUDA_CONVERSIONS)
   # Define the `CUDAToolkit` path.
   target_compile_definitions(obj.MLIRNVVMTarget
     PRIVATE
-    MLIR_NVPTXCOMPILER_ENABLED=${MLIR_ENABLE_NVPTXCOMPILER}
     __DEFAULT_CUDATOOLKIT_PATH__="${MLIR_CUDAToolkit_ROOT}"
   )
 endif()

mlir/lib/Target/LLVM/NVVM/Target.cpp

@@ -431,7 +431,7 @@ NVPTXSerializer::compileToBinary(const std::string &ptxCode) {
   return SmallVector<char, 0>(fatbin.begin(), fatbin.end());
 }
 
-#if MLIR_NVPTXCOMPILER_ENABLED == 1
+#if MLIR_ENABLE_NVPTXCOMPILER
 #include "nvPTXCompiler.h"
 
 #define RETURN_ON_NVPTXCOMPILER_ERROR(expr)                                    \
@@ -510,7 +510,7 @@ NVPTXSerializer::compileToBinaryNVPTX(const std::string &ptxCode) {
   RETURN_ON_NVPTXCOMPILER_ERROR(nvPTXCompilerDestroy(&compiler));
   return binary;
 }
-#endif // MLIR_NVPTXCOMPILER_ENABLED == 1
+#endif // MLIR_ENABLE_NVPTXCOMPILER
 
 std::optional<SmallVector<char, 0>>
 NVPTXSerializer::moduleToObject(llvm::Module &llvmModule) {
@@ -556,12 +556,12 @@ NVPTXSerializer::moduleToObject(llvm::Module &llvmModule) {
     return SmallVector<char, 0>(bin.begin(), bin.end());
   }
 
-    // Compile to binary.
-#if MLIR_NVPTXCOMPILER_ENABLED == 1
+  // Compile to binary.
+#if MLIR_ENABLE_NVPTXCOMPILER
   return compileToBinaryNVPTX(*serializedISA);
 #else
   return compileToBinary(*serializedISA);
-#endif // MLIR_NVPTXCOMPILER_ENABLED == 1
+#endif // MLIR_ENABLE_NVPTXCOMPILER
 }
 #endif // MLIR_ENABLE_CUDA_CONVERSIONS
 

utils/bazel/llvm-project-overlay/mlir/BUILD.bazel

@@ -36,8 +36,14 @@ expand_template(
         "#cmakedefine MLIR_GREEDY_REWRITE_RANDOMIZER_SEED ${MLIR_GREEDY_REWRITE_RANDOMIZER_SEED}": "/* #undef MLIR_GREEDY_REWRITE_RANDOMIZER_SEED */",
         "#cmakedefine01 MLIR_ENABLE_PDL_IN_PATTERNMATCH": "#define MLIR_ENABLE_PDL_IN_PATTERNMATCH 1",
     } | if_cuda_available(
-        {"#cmakedefine01 MLIR_ENABLE_CUDA_CONVERSIONS": "#define MLIR_ENABLE_CUDA_CONVERSIONS 1"},
-        {"#cmakedefine01 MLIR_ENABLE_CUDA_CONVERSIONS": "#define MLIR_ENABLE_CUDA_CONVERSIONS 0"},
+        {
+            "#cmakedefine01 MLIR_ENABLE_CUDA_CONVERSIONS": "#define MLIR_ENABLE_CUDA_CONVERSIONS 1",
+            "#cmakedefine01 MLIR_ENABLE_NVPTXCOMPILER": "#define MLIR_ENABLE_NVPTXCOMPILER 1",
+        },
+        {
+            "#cmakedefine01 MLIR_ENABLE_CUDA_CONVERSIONS": "#define MLIR_ENABLE_CUDA_CONVERSIONS 0",
+            "#cmakedefine01 MLIR_ENABLE_NVPTXCOMPILER": "#define MLIR_ENABLE_NVPTXCOMPILER 0",
+        },
     ),
     template = "include/mlir/Config/mlir-config.h.cmake",
 )