[tests] Enable MLIR C++ unittest with lit

.github/workflows/build-llvm.yml

@@ -26,7 +26,7 @@ jobs:
         run: |
           mkdir llvm-install
           cmake -G Ninja llvm -B build -DCMAKE_INSTALL_PREFIX=llvm-install \
-            -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=true -DLLVM_ENABLE_PROJECTS="mlir" -DLLVM_TARGETS_TO_BUILD="X86" -DLLVM_INSTALL_UTILS=true -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+            -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=true -DLLVM_ENABLE_PROJECTS="mlir" -DLLVM_TARGETS_TO_BUILD="X86" -DLLVM_INSTALL_UTILS=true -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DLLVM_INSTALL_GTEST=ON
           cmake --build build --target install
           cd llvm-install
           tar -zcf ../llvm.tgz .

CMakeLists.txt

@@ -56,4 +56,5 @@ set(GC_LIB_LINKED_LIBS
 )
 target_link_libraries(graph_compiler PRIVATE ${GC_LIB_LINKED_LIBS})
 
+add_subdirectory(unittests)
 add_subdirectory(test)

test/CMakeLists.txt

@@ -18,10 +18,18 @@ configure_lit_site_cfg(
         ${CMAKE_CURRENT_SOURCE_DIR}/lit.cfg.py
 )
 
+configure_lit_site_cfg(
+        ${CMAKE_CURRENT_SOURCE_DIR}/gc/Unit/lit.site.cfg.py.in
+        ${CMAKE_CURRENT_BINARY_DIR}/gc/Unit/lit.site.cfg.py
+        MAIN_CONFIG
+        ${CMAKE_CURRENT_SOURCE_DIR}/gc/Unit/lit.cfg.py
+)
+
 set(GC_OPT_TEST_DEPENDS
         FileCheck count not
         # mlir-gen
         gc-opt
+        GCUnitTests
         )
 
 add_lit_testsuite(gc-check "Running the regression tests"

test/gc/Unit/lit.cfg.py

@@ -0,0 +1,50 @@
+# -*- Python -*-
+
+# Configuration file for the 'lit' test runner.
+
+import os
+import subprocess
+
+import lit.formats
+
+# name: The name of this test suite.
+config.name = "GC-Unit"
+
+# suffixes: A list of file extensions to treat as test files.
+config.suffixes = []
+
+# test_source_root: The root path where tests are located.
+# test_exec_root: The root path where tests should be run.
+config.test_exec_root = os.path.join(config.gc_obj_root, "unittests")
+config.test_source_root = config.test_exec_root
+
+# testFormat: The test format to use to interpret tests.
+config.test_format = lit.formats.GoogleTest(config.llvm_build_mode, "Tests")
+
+# Propagate the temp directory. Windows requires this because it uses \Windows\
+# if none of these are present.
+if "TMP" in os.environ:
+    config.environment["TMP"] = os.environ["TMP"]
+if "TEMP" in os.environ:
+    config.environment["TEMP"] = os.environ["TEMP"]
+
+# Propagate HOME as it can be used to override incorrect homedir in passwd
+# that causes the tests to fail.
+if "HOME" in os.environ:
+    config.environment["HOME"] = os.environ["HOME"]
+
+# Propagate sanitizer options.
+for var in [
+    "ASAN_SYMBOLIZER_PATH",
+    "HWASAN_SYMBOLIZER_PATH",
+    "MSAN_SYMBOLIZER_PATH",
+    "TSAN_SYMBOLIZER_PATH",
+    "UBSAN_SYMBOLIZER_PATH",
+    "ASAN_OPTIONS",
+    "HWASAN_OPTIONS",
+    "MSAN_OPTIONS",
+    "TSAN_OPTIONS",
+    "UBSAN_OPTIONS",
+]:
+    if var in os.environ:
+        config.environment[var] = os.environ[var]

test/gc/Unit/lit.site.cfg.py.in

@@ -0,0 +1,12 @@
+@LIT_SITE_CFG_IN_HEADER@
+
+import sys
+
+config.llvm_tools_dir = lit_config.substitute("@LLVM_TOOLS_DIR@")
+config.llvm_build_mode = lit_config.substitute("@LLVM_BUILD_MODE@")
+config.mlir_obj_root = "@MLIR_BINARY_DIR@"
+config.gc_src_root = "@CMAKE_SOURCE_DIR@"
+config.gc_obj_root = "@CMAKE_BINARY_DIR@"
+
+# Let the main config do the real work.
+lit_config.load_config(config, "@CMAKE_SOURCE_DIR@/test/gc/Unit/lit.cfg.py")

unittests/CMakeLists.txt

@@ -0,0 +1,18 @@
+if (NOT GC_TEST_ENABLE)
+    message(STATUS "The unittests are not enabled.")
+    return()
+endif ()
+
+add_definitions(-DMLIR_INCLUDE_TESTS)
+add_custom_target(GCUnitTests)
+set_target_properties(GCUnitTests PROPERTIES FOLDER "MLIR GC Tests")
+
+# To silence warning caused by Wundef.
+add_definitions(-DGTEST_NO_LLVM_SUPPORT=0)
+
+function(add_mlir_unittest test_dirname)
+  add_unittest(GCUnitTests ${test_dirname} ${ARGN})
+endfunction()
+
+add_subdirectory(Example)
+

unittests/Example/CMakeLists.txt

@@ -0,0 +1,6 @@
+add_mlir_unittest(GCExampleTests
+  Example.cpp
+)
+target_link_libraries(GCExampleTests
+  PRIVATE
+  MLIRLinalgx)

unittests/Example/Example.cpp

@@ -0,0 +1,14 @@
+//===- Example.cpp - Tests for Example ------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "gc/Dialect/Linalgx/LinalgxDialect.h"
+#include "gtest/gtest.h"
+
+TEST(example, HelloWorld) {
+  ASSERT_EQ(mlir::linalgx::LinalgxDialect::getDialectNamespace(), "linalgx");
+}