expat 2017-12-12 (36f8db49)

Code extracted from:

    https://gitlab.kitware.com/third-party/expat.git

at commit 36f8db49080af33d676ec6b2706573054cacc680 (for/vtk).

ConfigureChecks.cmake

@@ -2,7 +2,6 @@ include(CheckCCompilerFlag)
 include(CheckCSourceCompiles)
 include(CheckIncludeFile)
 include(CheckIncludeFiles)
-include(CheckFunctionExists)
 include(CheckSymbolExists)
 include(TestBigEndian)
 
@@ -18,21 +17,19 @@ check_include_file("sys/stat.h" HAVE_SYS_STAT_H)
 check_include_file("sys/types.h" HAVE_SYS_TYPES_H)
 check_include_file("unistd.h" HAVE_UNISTD_H)
 
-check_function_exists("getpagesize" HAVE_GETPAGESIZE)
-check_function_exists("getrandom" HAVE_GETRANDOM)
-check_function_exists("SYS_getrandom" HAVE_SYSCALL_GETRANDOM)
-check_function_exists("arc4random_buf" HAVE_ARC4RANDOM_BUF)
-check_function_exists("bcopy" HAVE_BCOPY)
+check_symbol_exists("getpagesize" "unistd.h" HAVE_GETPAGESIZE)
+check_symbol_exists("getrandom" "sys/random.h" HAVE_GETRANDOM)
+check_symbol_exists("bcopy" "strings.h" HAVE_BCOPY)
 check_symbol_exists("memmove" "string.h" HAVE_MEMMOVE)
-check_function_exists("mmap" HAVE_MMAP)
-check_function_exists("getrandom" HAVE_GETRANDOM)
+check_symbol_exists("mmap" "sys/mman.h" HAVE_MMAP)
+check_symbol_exists("getrandom" "sys/random.h" HAVE_GETRANDOM)
 
 if(USE_libbsd)
     set(CMAKE_REQUIRED_LIBRARIES "${LIB_BSD}")
 endif()
-check_function_exists("arc4random_buf" HAVE_ARC4RANDOM_BUF)
+check_symbol_exists("arc4random_buf" "stdlib.h" HAVE_ARC4RANDOM_BUF)
 if(NOT HAVE_ARC4RANDOM_BUF)
-    check_function_exists("arc4random" HAVE_ARC4RANDOM)
+    check_symbol_exists("arc4random" "stdlib.h" HAVE_ARC4RANDOM)
 endif()
 set(CMAKE_REQUIRED_LIBRARIES)