llvmPackages.mlir: version tablegen patch

The patch failed to apply on 18 and 19. We have to version it.

LLVM 18 has no MLIR_SRC_SHARDER_TABLEGEN_EXE. LLVM 19 and 20 fail to
apply the 21+ patch due to mechanical hunk failures, but otherwise use
an identical patch to 21+.

pkgs/development/compilers/llvm/18/mlir/mlir-tablegen-imported-target.patch

@@ -0,0 +1,49 @@
+diff --git a/cmake/modules/MLIRConfig.cmake.in b/cmake/modules/MLIRConfig.cmake.in
+--- a/cmake/modules/MLIRConfig.cmake.in
++++ b/cmake/modules/MLIRConfig.cmake.in
+@@ -9,8 +9,13 @@ find_package(LLVM ${LLVM_VERSION} EXACT REQUIRED CONFIG
+ set(MLIR_EXPORTED_TARGETS "@MLIR_EXPORTS@")
+ set(MLIR_CMAKE_DIR "@MLIR_CONFIG_CMAKE_DIR@")
+ set(MLIR_INCLUDE_DIRS "@MLIR_CONFIG_INCLUDE_DIRS@")
+-set(MLIR_TABLEGEN_EXE "@MLIR_CONFIG_TABLEGEN_EXE@")
+-set(MLIR_PDLL_TABLEGEN_EXE "@MLIR_CONFIG_PDLL_TABLEGEN_EXE@")
++# Allow users to override tablegen executables (e.g. for sandboxed builds).
++if(NOT MLIR_TABLEGEN_EXE)
++  set(MLIR_TABLEGEN_EXE "@MLIR_CONFIG_TABLEGEN_EXE@")
++endif()
++if(NOT MLIR_PDLL_TABLEGEN_EXE)
++  set(MLIR_PDLL_TABLEGEN_EXE "@MLIR_CONFIG_PDLL_TABLEGEN_EXE@")
++endif()
+ set(MLIR_INSTALL_AGGREGATE_OBJECTS "@MLIR_INSTALL_AGGREGATE_OBJECTS@")
+ set(MLIR_ENABLE_BINDINGS_PYTHON "@MLIR_ENABLE_BINDINGS_PYTHON@")
+ set(MLIR_ENABLE_EXECUTION_ENGINE "@MLIR_ENABLE_EXECUTION_ENGINE@")
+@@ -34,6 +39,29 @@ if(NOT TARGET MLIRSupport)
+   @MLIR_CONFIG_INCLUDE_EXPORTS@
+ endif()
+
++# Ensure MLIR_TABLEGEN_EXE is a full path and has a corresponding imported
++# target. In install trees, MLIR_TABLEGEN_EXE may be a bare name
++# ("mlir-tblgen") rather than an absolute path. Resolve it so that
++# TableGen.cmake can use it as both a COMMAND and a DEPENDS entry.
++if(MLIR_TABLEGEN_EXE AND NOT IS_ABSOLUTE "${MLIR_TABLEGEN_EXE}"
++    AND NOT TARGET "${MLIR_TABLEGEN_EXE}")
++  find_program(_mlir_tblgen_exe "${MLIR_TABLEGEN_EXE}"
++    HINTS "${LLVM_TOOLS_BINARY_DIR}")
++  if(_mlir_tblgen_exe)
++    set(MLIR_TABLEGEN_EXE "${_mlir_tblgen_exe}")
++  endif()
++  unset(_mlir_tblgen_exe)
++endif()
++
++if(NOT TARGET mlir-tblgen AND MLIR_TABLEGEN_EXE)
++  add_executable(mlir-tblgen IMPORTED GLOBAL)
++  set_target_properties(mlir-tblgen PROPERTIES
++    IMPORTED_LOCATION "${MLIR_TABLEGEN_EXE}")
++endif()
++if(NOT DEFINED MLIR_TABLEGEN_TARGET)
++  set(MLIR_TABLEGEN_TARGET mlir-tblgen)
++endif()
++
+ # By creating these targets here, subprojects that depend on MLIR's
+ # tablegen-generated headers can always depend on these targets whether building
+ # in-tree with MLIR or not.

pkgs/development/compilers/llvm/19/mlir/mlir-tablegen-imported-target.patch

@@ -0,0 +1,53 @@
+diff --git a/cmake/modules/MLIRConfig.cmake.in b/cmake/modules/MLIRConfig.cmake.in
+--- a/cmake/modules/MLIRConfig.cmake.in
++++ b/cmake/modules/MLIRConfig.cmake.in
+@@ -9,9 +9,16 @@ find_package(LLVM ${LLVM_VERSION} EXACT REQUIRED CONFIG
+ set(MLIR_EXPORTED_TARGETS "@MLIR_EXPORTS@")
+ set(MLIR_CMAKE_DIR "@MLIR_CONFIG_CMAKE_DIR@")
+ set(MLIR_INCLUDE_DIRS "@MLIR_CONFIG_INCLUDE_DIRS@")
+-set(MLIR_TABLEGEN_EXE "@MLIR_CONFIG_TABLEGEN_EXE@")
+-set(MLIR_PDLL_TABLEGEN_EXE "@MLIR_CONFIG_PDLL_TABLEGEN_EXE@")
+-set(MLIR_SRC_SHARDER_TABLEGEN_EXE "@MLIR_CONFIG_SRC_SHARDER_TABLEGEN_EXE@")
++# Allow users to override tablegen executables (e.g. for sandboxed builds).
++if(NOT MLIR_TABLEGEN_EXE)
++  set(MLIR_TABLEGEN_EXE "@MLIR_CONFIG_TABLEGEN_EXE@")
++endif()
++if(NOT MLIR_PDLL_TABLEGEN_EXE)
++  set(MLIR_PDLL_TABLEGEN_EXE "@MLIR_CONFIG_PDLL_TABLEGEN_EXE@")
++endif()
++if(NOT MLIR_SRC_SHARDER_TABLEGEN_EXE)
++  set(MLIR_SRC_SHARDER_TABLEGEN_EXE "@MLIR_CONFIG_SRC_SHARDER_TABLEGEN_EXE@")
++endif()
+ set(MLIR_INSTALL_AGGREGATE_OBJECTS "@MLIR_INSTALL_AGGREGATE_OBJECTS@")
+ set(MLIR_ENABLE_BINDINGS_PYTHON "@MLIR_ENABLE_BINDINGS_PYTHON@")
+ set(MLIR_ENABLE_EXECUTION_ENGINE "@MLIR_ENABLE_EXECUTION_ENGINE@")
+@@ -35,6 +42,29 @@ if(NOT TARGET MLIRSupport)
+   @MLIR_CONFIG_INCLUDE_EXPORTS@
+ endif()
+
++# Ensure MLIR_TABLEGEN_EXE is a full path and has a corresponding imported
++# target. In install trees, MLIR_TABLEGEN_EXE may be a bare name
++# ("mlir-tblgen") rather than an absolute path. Resolve it so that
++# TableGen.cmake can use it as both a COMMAND and a DEPENDS entry.
++if(MLIR_TABLEGEN_EXE AND NOT IS_ABSOLUTE "${MLIR_TABLEGEN_EXE}"
++    AND NOT TARGET "${MLIR_TABLEGEN_EXE}")
++  find_program(_mlir_tblgen_exe "${MLIR_TABLEGEN_EXE}"
++    HINTS "${LLVM_TOOLS_BINARY_DIR}")
++  if(_mlir_tblgen_exe)
++    set(MLIR_TABLEGEN_EXE "${_mlir_tblgen_exe}")
++  endif()
++  unset(_mlir_tblgen_exe)
++endif()
++
++if(NOT TARGET mlir-tblgen AND MLIR_TABLEGEN_EXE)
++  add_executable(mlir-tblgen IMPORTED GLOBAL)
++  set_target_properties(mlir-tblgen PROPERTIES
++    IMPORTED_LOCATION "${MLIR_TABLEGEN_EXE}")
++endif()
++if(NOT DEFINED MLIR_TABLEGEN_TARGET)
++  set(MLIR_TABLEGEN_TARGET mlir-tblgen)
++endif()
++
+ # By creating these targets here, subprojects that depend on MLIR's
+ # tablegen-generated headers can always depend on these targets whether building
+ # in-tree with MLIR or not.

pkgs/development/compilers/llvm/21/mlir/mlir-tablegen-imported-target.patch

@@ -1,5 +1,4 @@
 diff --git a/cmake/modules/MLIRConfig.cmake.in b/cmake/modules/MLIRConfig.cmake.in
-index 71f3e028b1e8..b30b6cdc0de1 100644
 --- a/cmake/modules/MLIRConfig.cmake.in
 +++ b/cmake/modules/MLIRConfig.cmake.in
 @@ -9,9 +9,16 @@ find_package(LLVM ${LLVM_VERSION} EXACT REQUIRED CONFIG

pkgs/development/compilers/llvm/common/mlir/default.nix

@@ -53,7 +53,7 @@ stdenv.mkDerivation (finalAttrs: {
     # workaround in flang's CMakeLists.txt.
 
     # Upstream issue: https://github.com/llvm/llvm-project/issues/150986
-    ./mlir-tablegen-imported-target.patch
+    (getVersionFile "mlir/mlir-tablegen-imported-target.patch")
   ]
   ++ lib.optionals (lib.versionOlder release_version "20") [
     # Fix build with gcc15

pkgs/development/compilers/llvm/common/patches.nix

@@ -129,6 +129,21 @@
       path = ../19;
     }
   ];
+  "mlir/mlir-tablegen-imported-target.patch" = [
+    {
+      before = "19";
+      path = ../18;
+    }
+    {
+      after = "19";
+      before = "21";
+      path = ../19;
+    }
+    {
+      after = "21";
+      path = ../21;
+    }
+  ];
   "flang/warn-on-fbuiltin-and-fno-builtin.patch" = [
     {
       after = "20";