[build] Add build check for ::arc4random().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156236 91177308-0d34-0410-b5e6-96231b3b80d8

autoconf/configure.ac

@@ -1346,7 +1346,7 @@ AC_CHECK_FUNCS([powf fmodf strtof round ])
 AC_CHECK_FUNCS([getpagesize getrusage getrlimit setrlimit gettimeofday ])
 AC_CHECK_FUNCS([isatty mkdtemp mkstemp ])
 AC_CHECK_FUNCS([mktemp posix_spawn pread realpath sbrk setrlimit strdup ])
-AC_CHECK_FUNCS([strerror strerror_r setenv ])
+AC_CHECK_FUNCS([strerror strerror_r setenv arc4random ])
 AC_CHECK_FUNCS([strtoll strtoq sysconf malloc_zone_statistics ])
 AC_CHECK_FUNCS([setjmp longjmp sigsetjmp siglongjmp writev])
 AC_C_PRINTF_A

cmake/config-ix.cmake

@@ -91,6 +91,7 @@ if( NOT PURE_WINDOWS )
 endif()
 
 # function checks
+check_symbol_exists(arc4random "stdlib.h" HAVE_ARC4RANDOM)
 check_symbol_exists(getpagesize unistd.h HAVE_GETPAGESIZE)
 check_symbol_exists(getrusage sys/resource.h HAVE_GETRUSAGE)
 check_symbol_exists(setrlimit sys/resource.h HAVE_SETRLIMIT)

configure

@@ -17522,7 +17522,8 @@ done
 
 
 
-for ac_func in strerror strerror_r setenv
+
+for ac_func in strerror strerror_r setenv arc4random
 do
 as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
 { echo "$as_me:$LINENO: checking for $ac_func" >&5

include/llvm/Config/config.h.cmake

@@ -23,6 +23,9 @@
 /* Define if timestamp information (e.g., __DATE___) is allowed */
 #cmakedefine ENABLE_TIMESTAMPS ${ENABLE_TIMESTAMPS}
 
+/* Define to 1 if you have the `arc4random' function. */
+#cmakedefine HAVE_ARC4RANDOM
+
 /* Define to 1 if you have the `argz_append' function. */
 #cmakedefine HAVE_ARGZ_APPEND ${HAVE_ARGZ_APPEND}
 

include/llvm/Config/config.h.in

@@ -24,6 +24,9 @@
 /* Directory where gcc is installed. */
 #undef GCC_INSTALL_PREFIX
 
+/* Define to 1 if you have the `arc4random' function. */
+#undef HAVE_ARC4RANDOM
+
 /* Define to 1 if you have the `argz_append' function. */
 #undef HAVE_ARGZ_APPEND