code.delx.au - pulseaudio/blob - m4/tls.m4

   1 AC_DEFUN([CC_CHECK_TLS], [
   2   AC_CACHE_CHECK([whether $CC knows __thread for Thread-Local Storage],
   3     cc_cv_tls___thread,
   4     [AC_COMPILE_IFELSE(
   5       AC_LANG_PROGRAM(
   6         [[static __thread int a = 6;]],
   7         [[a = 5;]]),
   8       [cc_cv_tls___thread=yes],
   9       [cc_cv_tls___thread=no])
  10     ])
  11
  12   AS_IF([test "x$cc_cv_tls___thread" = "xyes"],
  13     [AC_DEFINE([SUPPORT_TLS___THREAD], 1,
  14      [Define this if the compiler supports __thread for Thread-Local Storage])
  15      $1],
  16     [$2])
  17 ])