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cmake_minimum_required(VERSION 2.8)

project(test_cmake)

file(GLOB sourceFiles main.cpp)

file(GLOB preJsFiles pre*.js)
file(GLOB postJsFiles post*.js)
file(GLOB libraryJsFiles jslibrary*.js)

if (CMAKE_BUILD_TYPE STREQUAL Debug)
	SET(linkFlags "-g4 -s NO_EXIT_RUNTIME=1")
else() # Either MinSizeRel, RelWithDebInfo or Release, all which run with optimizations enabled.
	SET(linkFlags "-O2 -s NO_EXIT_RUNTIME=1")
endif()

# Test that the CMake-provided macro check_function_exists() works.
include(CheckFunctionExists)
check_function_exists("strtod" HAVE_STRTOD)
if (NOT ${HAVE_STRTOD})
	message(FATAL_ERROR "CMake script check_function_exists failed! Could not detect if strtod() is supported!")
endif()

# Test that the CMake-provided macro check_function_exists() is not actually trivially returning true for everything.
check_function_exists("some_nonexisting_function" HAVE_NONEXISTING_FUNCTION)
if (${HAVE_NONEXISTING_FUNCTION})
	message(FATAL_ERROR "CMake script check_function_exists failed! It erroneously reports that function some_nonexisting_function() would exist!")
endif()

# Test that the CMake-provided macro check_include_file() works.
include(CheckIncludeFile)
check_include_file(stdlib.h HAVE_STDLIB_H)
if (NOT ${HAVE_STDLIB_H})
	message(FATAL_ERROR "CMake script check_include_file failed! Could not find stdlib.h via it!")
endif()

# Test that the CMake-provided macro check_include_file() is not actually trivially returning true for everything.
check_include_file(some_nonexisting_include.h HAVE_NONEXISTING_INCLUDE_H)
if (${HAVE_NONEXISTING_INCLUDE_H})
	message(FATAL_ERROR "CMake script check_include_file failed! It erroneously reports that the C header some_nonexisting_include.h would exist!")
endif()

if (NOT CMAKE_EXECUTABLE_SUFFIX STREQUAL ".js")
	message(FATAL_ERROR "The default suffix for building executables should be .js!")
endif()

# CMake built-in check_include_file() macro interacts with CMAKE_EXECUTABLE_SUFFIX, so make sure it works after user changes that.

check_include_file(math.h HAVE_MATH_H)
if (NOT ${HAVE_MATH_H})
	message(FATAL_ERROR "CMake script check_include_file failed! Could not find math.h via it!")
endif()

if (WIN32)
	message(FATAL_ERROR "WIN32 should not be defined when cross-compiling!")
endif()

if (APPLE)
	message(FATAL_ERROR "APPLE should not be defined when cross-compiling!")
endif()

if (NOT EMSCRIPTEN)
	message(FATAL_ERROR "EMSCRIPTEN should be defined when cross-compiling!")
endif()

if (NOT CMAKE_C_SIZEOF_DATA_PTR)
	message(FATAL_ERROR "CMAKE_C_SIZEOF_DATA_PTR was not defined!")
endif()

add_executable(test_cmake ${sourceFiles})

# GOTCHA: If your project has custom link flags, these must be set *before* calling any of the em_link_xxx functions!
set_target_properties(test_cmake PROPERTIES LINK_FLAGS "${linkFlags}")

message(STATUS "js libs '${libraryJsFiles}'")
# To link .js files using the --js-library flag, use the following helper function.
em_link_js_library(test_cmake ${libraryJsFiles})

# To link .js files using the --pre-js flag, use the following helper function.
em_link_pre_js(test_cmake ${preJsFiles})

# To link .js files using the --post-js flag, use the following helper function.
em_link_post_js(test_cmake ${postJsFiles})