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AC_DEFUN([CC_CHECK_TLS], [
AC_CACHE_CHECK([whether $CC knows __thread for Thread-Local Storage],
cc_cv_tls___thread,
[AC_COMPILE_IFELSE(
AC_LANG_PROGRAM(
[[static __thread int a = 6;]],
[[a = 5;]]),
[cc_cv_tls___thread=yes],
[cc_cv_tls___thread=no])
])
AS_IF([test "x$cc_cv_tls___thread" = "xyes"],
[AC_DEFINE([SUPPORT_TLS___THREAD], 1,
[Define this if the compiler supports __thread for Thread-Local Storage])
$1],
[$2])
])
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