[Mlir-commits] [mlir] [MLIR][ExecutionEngine] Introduce shared library (PR #87067)

[Christian Ulmann]

https://github.com/Dinistro created https://github.com/llvm/llvm-project/pull/87067

This commit introduces a shared library for the MLIR execution engine. This library is only built when `LLVM_BUILD_LLVM_DYLIB` is set. Having such a library allows downstream users to depend on the execution engine without giving up dynamic linkage. This is especially important for CPU runner-style tools, as they link against large parts of MLIR and LLVM.

It is alternatively possible to modify the `MLIRExecutionEngine`  target when `LLVM_BUILD_LLVM_DYLIB`  is set, to avoid duplicated libraries. 

>From a4dfb11d74631ebc681a0ce4702dc16d03b37de3 Mon Sep 17 00:00:00 2001
From: Christian Ulmann <christianulmann at gmail.com>
Date: Fri, 29 Mar 2024 14:36:36 +0100
Subject: [PATCH] [MLIR][ExecutionEngine] Introduce shared library

This commit introduces a shared library for the MLIR execution engine.
This library is only built when `LLVM_BUILD_LLVM_DYLIB` is set. Having
such a library allows downstream users to depend on the execution engine
without giving up dynamic linkage. This is especially important for CPU
runner style tools, as they link against large parts of MLIR and LLVM.
---
 mlir/lib/ExecutionEngine/CMakeLists.txt | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/mlir/lib/ExecutionEngine/CMakeLists.txt b/mlir/lib/ExecutionEngine/CMakeLists.txt
index b7e448d5417ea9..a091944b9ee7df 100644
--- a/mlir/lib/ExecutionEngine/CMakeLists.txt
+++ b/mlir/lib/ExecutionEngine/CMakeLists.txt
@@ -97,6 +97,29 @@ add_mlir_library(MLIRExecutionEngine
   MLIRTargetLLVMIRExport
   )
 
+if(LLVM_BUILD_LLVM_DYLIB)
+  # Build a shared library for the execution engine. Some downstream projects
+  # use this library to build their own CPU runners while preserving dynamic
+  # linkage.
+  add_mlir_library(MLIRExecutionEngineShared
+    ExecutionEngine.cpp
+    SHARED
+
+    EXCLUDE_FROM_LIBMLIR
+
+    ADDITIONAL_HEADER_DIRS
+    ${MLIR_MAIN_INCLUDE_DIR}/mlir/ExecutionEngine
+
+    # Ensures that all necessary dependencies are resolved.
+    DEPENDS
+    MLIRExecutionEngine
+
+    LINK_LIBS PUBLIC
+    LLVM
+    MLIR
+    )
+endif()
+
 get_property(dialect_libs GLOBAL PROPERTY MLIR_DIALECT_LIBS)
 add_mlir_library(MLIRJitRunner
   JitRunner.cpp