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Create a new macro for checking compiler support for TLS.

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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.
This commit is contained in:
Diego 'Flameeyes' Pettenò 2008-08-08 14:03:54 +02:00
parent 81969a73a4
commit daf3e8b97d
3 changed files with 19 additions and 12 deletions
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17
m4/tls.m4 Normal file
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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])
])