Start on CMake support.

ext/ruby_prof/CMakeLists.txt

@@ -0,0 +1,49 @@
+# CMakeList.txt : Top-level CMake project file, do global configuration
+# and include sub-projects here.
+#
+cmake_minimum_required (VERSION 3.8)
+
+project(ruby-prof)
+
+# Enable Hot Reload for MSVC compilers if supported.
+if (POLICY CMP0141)
+  cmake_policy(SET CMP0141 NEW)
+  set(CMAKE_MSVC_DEBUG_INFORMATION_FORMAT "$<IF:$<AND:$<C_COMPILER_ID:MSVC>,$<CXX_COMPILER_ID:MSVC>>,$<$<CONFIG:Debug,RelWithDebInfo>:EditAndContinue>,$<$<CONFIG:Debug,RelWithDebInfo>:ProgramDatabase>>")
+endif()
+
+# Add source to this project's executable.
+add_library (ruby_prof SHARED
+        "rp_allocation.c"
+        "rp_call_tree.c"
+        "rp_call_trees.c"
+        "rp_measure_allocations.c"
+        "rp_measure_memory.c"
+        "rp_measure_process_time.c"
+        "rp_measure_wall_time.c"
+        "rp_measurement.c"
+        "rp_method.c"
+        "rp_profile.c"
+        "rp_stack.c"
+        "rp_thread.c"
+        "ruby_prof.c")
+
+set_target_properties(ruby_prof PROPERTIES
+        PREFIX ""
+        OUTPUT_NAME "ruby_prof"
+        SUFFIX ".so"
+        RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/..")
+
+set_property(TARGET ruby_prof PROPERTY C_STANDARD 99)
+
+if (MSVC)
+  target_include_directories(ruby_prof PRIVATE "C:/msys64/usr/local/ruby-3.2.1-vc/include/ruby-3.2.0")
+  target_include_directories(ruby_prof PRIVATE "C:/msys64/usr/local/ruby-3.2.1-vc/include/ruby-3.2.0/x64-mswin64_140")
+  target_link_libraries(ruby_prof "C:/msys64/usr/local/ruby-3.2.1-vc/lib/x64-vcruntime140-ruby320.lib")
+elseif (MINGW)
+  target_compile_options(ruby_prof PRIVATE -Wa,-mbig-obj)
+  target_include_directories(ruby_prof PRIVATE "C:/msys64/usr/local/ruby-3.2.0/include/ruby-3.2.0")
+  target_include_directories(ruby_prof PRIVATE "C:/msys64/usr/local/ruby-3.2.0/include/ruby-3.2.0/x64-mingw-ucrt")
+  target_link_libraries(ruby_prof "C:/msys64/usr/local/ruby-3.2.0/lib/libx64-ucrt-ruby320.dll.a")
+else ()
+  target_link_libraries(ruby_prof "/usr/lib64/libruby.so")
+endif ()