pulseaudio/m4/tls.m4

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])
])
Create a new macro for checking compiler support for TLS. Create a new macro that can be shared between projects to check for __thread support by the compiler. This macro might come useful for xine-lib too so I want to keep it separate for easier importing it over. Name the defined macro SUPPORT_TLS___THREAD to follow the same style as the checks from attributes.m4. 2008-08-08 14:03:54 +02:00			`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])`
			`])`