cmake_minimum_required(VERSION 3.0)

project(find_stuff)

# Test that we can find system headers

find_file(HAS_STRING_H_1 NAMES string.h)

if (NOT HAS_STRING_H_1)

message(FATAL_ERROR "No string.h via find_file")

endif()

message(STATUS "find_file string.h: ${HAS_STRING_H_1}")

find_path(HAS_STRING_H_2 NAMES string.h)

if (NOT HAS_STRING_H_2)

message(FATAL_ERROR "No string.h via find_path")

endif()

message(STATUS "find_path string.h: ${HAS_STRING_H_2}")

include(CheckIncludeFile)

check_include_file(string.h HAS_STRING_H_3)

if (NOT HAS_STRING_H_3)

message(FATAL_ERROR "No string.h via check_include_file")

endif()

# Test that we can find system headers

include(CheckIncludeFileCXX)

check_include_file_cxx(string HAS_STRING)

if (NOT HAS_STRING)

message(FATAL_ERROR "No string header found via find_file")

endif()

message(STATUS "find_file string: ${HAS_STRING}")

# Test that we can libraries that exist in the sysroot

find_library(HAS_ZLIB NAMES libz.a)

if (NOT HAS_ZLIB)

message(FATAL_ERROR "libz.a not found via find_library")

endif()

message(STATUS "find_library libz.a: ${HAS_ZLIB}")

# Test that we can find host executables via find_program

find_program(HAS_CMAKE NAMES cmake)

if (NOT HAS_CMAKE)

message(FATAL_ERROR "cmake not found via find_program")

endif()

message(STATUS "find_program cmake: ${HAS_CMAKE}")

# Check that find_path honors PATHS

# See https://github.com/emscripten-core/emscripten/issues/10078

find_path(FOO_TXT foo.txt PATHS "${CMAKE_CURRENT_LIST_DIR}" NO_CMAKE_FIND_ROOT_PATH)

if (NOT FOO_TXT)

message(FATAL_ERROR "Can't find foo.txt in the current directory.")

endif()

message(STATUS "find_path foo: ${FOO_TXT}")