dnl Check whether the target supports TLS.
|
dnl Check whether the target supports TLS.
|
AC_DEFUN([GCC_CHECK_TLS], [
|
AC_DEFUN([GCC_CHECK_TLS], [
|
GCC_ENABLE(tls, yes, [], [Use thread-local storage])
|
GCC_ENABLE(tls, yes, [], [Use thread-local storage])
|
AC_CACHE_CHECK([whether the target supports thread-local storage],
|
AC_CACHE_CHECK([whether the target supports thread-local storage],
|
have_tls, [
|
have_tls, [
|
AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
|
AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
|
[dnl If the test case passed with dynamic linking, try again with
|
[dnl If the test case passed with dynamic linking, try again with
|
dnl static linking, but only if static linking is supported (not
|
dnl static linking, but only if static linking is supported (not
|
dnl on Solaris 10). This fails with some older Red Hat releases.
|
dnl on Solaris 10). This fails with some older Red Hat releases.
|
save_LDFLAGS="$LDFLAGS"
|
save_LDFLAGS="$LDFLAGS"
|
LDFLAGS="-static $LDFLAGS"
|
LDFLAGS="-static $LDFLAGS"
|
AC_LINK_IFELSE([int main() { return 0; }],
|
AC_LINK_IFELSE([int main() { return 0; }],
|
AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
|
AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
|
[have_tls=yes], [have_tls=no],[]),
|
[have_tls=yes], [have_tls=no],[]),
|
[have_tls=yes])
|
[have_tls=yes])
|
LDFLAGS="$save_LDFLAGS"],
|
LDFLAGS="$save_LDFLAGS"],
|
[have_tls=no],
|
[have_tls=no],
|
[AC_COMPILE_IFELSE([__thread int foo;], [have_tls=yes], [have_tls=no])]
|
[AC_COMPILE_IFELSE([__thread int foo;], [have_tls=yes], [have_tls=no])]
|
)])
|
)])
|
if test "$enable_tls $have_tls" = "yes yes"; then
|
if test "$enable_tls $have_tls" = "yes yes"; then
|
AC_DEFINE(HAVE_TLS, 1,
|
AC_DEFINE(HAVE_TLS, 1,
|
[Define to 1 if the target supports thread-local storage.])
|
[Define to 1 if the target supports thread-local storage.])
|
fi])
|
fi])
|
|
|
