Build perf via cmake.

CMakeLists.txt

@@ -51,6 +51,12 @@ if(TAOCPP_JSON_BUILD_EXAMPLES)
   add_subdirectory(src/example/json)
 endif()
 
+# performance
+option(TAOCPP_JSON_BUILD_PERFORMANCE "Build performance programs" ${TAOCPP_JSON_IS_MAIN_PROJECT})
+if(TAOCPP_JSON_BUILD_PERFORMANCE)
+  add_subdirectory(src/perf/json)
+endif()
+
 option(TAOCPP_JSON_INSTALL "Generate the install target" ${TAOCPP_JSON_IS_MAIN_PROJECT})
 if(TAOCPP_JSON_INSTALL)
   include(CMakePackageConfigHelpers)

src/perf/json/CMakeLists.txt

@@ -0,0 +1,42 @@
+cmake_minimum_required(VERSION 3.8...3.19)
+
+set(perfsources
+  benchmark.cpp
+  parse_file.cpp
+  pretty_print_file.cpp
+  print_double.cpp
+  print_file.cpp
+  sizes.cpp
+  syntax_only.cpp
+)
+
+# file(GLOB ...) is used to validate the above list of perf_sources
+file(GLOB glob_perf_sources RELATIVE ${CMAKE_CURRENT_LIST_DIR} *.cpp)
+
+foreach(perfsourcefile ${perfsources})
+  if(${perfsourcefile} IN_LIST glob_perf_sources)
+    list(REMOVE_ITEM glob_perf_sources ${perfsourcefile})
+  else()
+    message(SEND_ERROR "File ${perfsourcefile} is missing from src/perf/json")
+  endif()
+  get_filename_component(exename ${perfsourcefile} NAME_WE)
+  set(exename "tao-json-perf-${exename}")
+  add_executable(${exename} ${perfsourcefile})
+  target_link_libraries(${exename} PRIVATE taocpp::json)
+  set_target_properties(${exename} PROPERTIES
+    CXX_STANDARD 11
+    CXX_STANDARD_REQUIRED ON
+    CXX_EXTENSIONS OFF
+  )
+  if(MSVC)
+    target_compile_options(${exename} PRIVATE /W4 /WX /utf-8)
+  else()
+    target_compile_options(${exename} PRIVATE -pedantic -Wall -Wextra -Wshadow -Werror)
+  endif()
+endforeach()
+
+if(glob_perf_sources)
+  foreach(ignored_source_file ${glob_perf_sources})
+    message(SEND_ERROR "File ${ignored_source_file} in src/perf/json is ignored")
+  endforeach()
+endif()