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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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12
configure.ac
View file

@ -199,17 +199,7 @@ else
esac
fi
AC_MSG_CHECKING([whether $CC knows __thread])
AC_LANG_CONFTEST([static __thread int a = 6; int main() { a = 5; }])
$CC conftest.c $CFLAGS -o conftest > /dev/null 2> /dev/null
ret=$?
rm -f conftest.o conftest
if test $ret -eq 0 ; then
AC_DEFINE([HAVE_TLS_BUILTIN], 1, [Have __thread().])
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
fi
CC_CHECK_TLS
AC_MSG_CHECKING([whether $CC knows _Bool])
AC_LANG_CONFTEST([int main() { _Bool b; }])