release/20.x: [mlir][cmake] Do not export MLIR_MAIN_SRC_DIR and MLIR_INCLUDE_DIR (#125842) #127589
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…lvm#125842) MLIR_MAIN_SRC_DIR and MLIR_INCLUDE_DIR point to the source directory, which is not installed. As such, the installed MLIRConfig.cmake also should not reference it. The comment indicates that these are needed for mlir_tablegen(), but I don't see any related uses. The motivation for this is the use in flang, where we end up inheriting a meaningless MLIR_MAIN_SRC_DIR from a previous MLIR build, whose source directory doesn't exist anymore, and that cannot be overridden with the correct path, because it's not a cached variable. Instead do what all the other projects do for LLVM_MAIN_SRC_DIR and initialize MLIR_MAIN_SRC_DIR to CMAKE_CURRENT_SOURCE_DIR/../mlir. For MLIR_INCLUDE_DIR there already is an exported MLIR_INCLUDE_DIRS, which can be used instead. (cherry picked from commit 82bd148)
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@joker-eph What do you think about merging this PR to the release branch? |
llvmbot
added
mlir
flang
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@llvm/pr-subscribers-mlir @llvm/pr-subscribers-flang-fir-hlfir Author: None (llvmbot) ChangesBackport 82bd148 Requested by: @nikic Full diff: https://github.com/llvm/llvm-project/pull/127589.diff 3 Files Affected:
diff --git a/flang/CMakeLists.txt b/flang/CMakeLists.txt
index b619553ef8302..b24b177cc21cc 100644
--- a/flang/CMakeLists.txt
+++ b/flang/CMakeLists.txt
@@ -79,6 +79,8 @@ if(CMAKE_SIZEOF_VOID_P EQUAL 4)
message(FATAL_ERROR "flang isn't supported on 32 bit CPUs")
endif()
+set(MLIR_MAIN_SRC_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../mlir" CACHE PATH "Path to MLIR source tree")
+
if (FLANG_STANDALONE_BUILD)
set(FLANG_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
set(CMAKE_INCLUDE_CURRENT_DIR ON)
@@ -240,10 +242,9 @@ else()
set(FLANG_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
endif()
- set(MLIR_MAIN_SRC_DIR ${LLVM_MAIN_SRC_DIR}/../mlir ) # --src-root
- set(MLIR_INCLUDE_DIR ${MLIR_MAIN_SRC_DIR}/include ) # --includedir
+ set(MLIR_INCLUDE_DIRS ${MLIR_MAIN_SRC_DIR}/include ) # --includedir
set(MLIR_TABLEGEN_OUTPUT_DIR ${CMAKE_BINARY_DIR}/tools/mlir/include)
- include_directories(SYSTEM ${MLIR_INCLUDE_DIR})
+ include_directories(SYSTEM ${MLIR_INCLUDE_DIRS})
include_directories(SYSTEM ${MLIR_TABLEGEN_OUTPUT_DIR})
endif()
diff --git a/flang/include/flang/Optimizer/Dialect/CMakeLists.txt b/flang/include/flang/Optimizer/Dialect/CMakeLists.txt
index 10ab213b30b02..73f388cbab6c9 100644
--- a/flang/include/flang/Optimizer/Dialect/CMakeLists.txt
+++ b/flang/include/flang/Optimizer/Dialect/CMakeLists.txt
@@ -37,7 +37,7 @@ set_target_properties(flang-doc PROPERTIES FOLDER "Flang/Docs")
set(dialect_doc_filename "FIRLangRef")
set(LLVM_TARGET_DEFINITIONS FIROps.td)
-tablegen(MLIR ${dialect_doc_filename}.md -gen-op-doc "-I${MLIR_INCLUDE_DIR}")
+tablegen(MLIR ${dialect_doc_filename}.md -gen-op-doc)
set(GEN_DOC_FILE ${FLANG_BINARY_DIR}/docs/Dialect/${dialect_doc_filename}.md)
add_custom_command(
OUTPUT ${GEN_DOC_FILE}
diff --git a/mlir/cmake/modules/MLIRConfig.cmake.in b/mlir/cmake/modules/MLIRConfig.cmake.in
index 7076d94a32f2b..c695b5787af66 100644
--- a/mlir/cmake/modules/MLIRConfig.cmake.in
+++ b/mlir/cmake/modules/MLIRConfig.cmake.in
@@ -16,10 +16,6 @@ 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@")
-# For mlir_tablegen()
-set(MLIR_INCLUDE_DIR "@MLIR_INCLUDE_DIR@")
-set(MLIR_MAIN_SRC_DIR "@MLIR_MAIN_SRC_DIR@")
-
set_property(GLOBAL PROPERTY MLIR_ALL_LIBS "@MLIR_ALL_LIBS@")
set_property(GLOBAL PROPERTY MLIR_DIALECT_LIBS "@MLIR_DIALECT_LIBS@")
set_property(GLOBAL PROPERTY MLIR_CONVERSION_LIBS "@MLIR_CONVERSION_LIBS@")
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Requesting this for backport, because it unbreaks the flang standalone build for us. |
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Backport 82bd148
Requested by: @nikic