Fix fcloseall not defined on some platform

CMakeLists.txt

@@ -50,6 +50,13 @@ check_symbol_exists(strerror_r "string.h" HAVE_STRERROR_R)
 if (HAVE_STRERROR_R)
     test_strerror_r(HAVE_GNU_STRERROR_R)
 endif()
+if (NOT WIN32)
+    set(CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
+    check_symbol_exists(fcloseall "stdio.h" HAVE_FCLOSEALL)
+    if (HAVE_FCLOSEALL)
+        add_compile_definitions(_GNU_SOURCE)
+    endif()
+endif()
 configure_file("${CMAKE_CURRENT_SOURCE_DIR}/utils_config.h.in" "${CMAKE_CURRENT_BINARY_DIR}/utils_config.h")
 
 if (${CMAKE_C_COMPILER_ID} STREQUAL GNU)