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2007-02-09 Paolo Bonzini <bonzini@gnu.org>

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* Makefile.def: Sync with GCC.
	* Makefile.tpl: Sync with GCC.
	* Makefile.in: Regenerate.
	* configure: Regenerate.

	* config/acx.m4: Sync with GCC.
	* config/depstand.m4: Sync with GCC.
	* config/tls.m4: Sync with GCC.
This commit is contained in:
Paolo Bonzini
2007-02-09 19:24:42 +00:00
parent db7d66ec44
commit e6659c0029
10 changed files with 218 additions and 23 deletions
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59
config/tls.m4
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@@ -7,16 +7,67 @@ AC_DEFUN([GCC_CHECK_TLS], [
[dnl If the test case passed with dynamic linking, try again with
dnl static linking, but only if static linking is supported (not
dnl on Solaris 10). This fails with some older Red Hat releases.
save_LDFLAGS="$LDFLAGS"
chktls_save_LDFLAGS="$LDFLAGS"
LDFLAGS="-static $LDFLAGS"
AC_LINK_IFELSE([int main() { return 0; }],
AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
[have_tls=yes], [have_tls=no],[]),
[have_tls=yes])
LDFLAGS="$save_LDFLAGS"],
LDFLAGS="$chktls_save_LDFLAGS"
if test $have_tls = yes; then
dnl So far, the binutils and the compiler support TLS.
dnl Also check whether the libc supports TLS, i.e. whether a variable
dnl with __thread linkage has a different address in different threads.
dnl First, find the thread_CFLAGS necessary for linking a program that
dnl calls pthread_create.
chktls_save_CFLAGS="$CFLAGS"
thread_CFLAGS=failed
for flag in '' '-pthread' '-lpthread'; do
CFLAGS="$flag $chktls_save_CFLAGS"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[#include <pthread.h>
void *g(void *d) { return NULL; }],
[pthread_t t; pthread_create(&t,NULL,g,NULL);])],
[thread_CFLAGS="$flag"])
if test "X$thread_CFLAGS" != Xfailed; then
break
fi
done
CFLAGS="$chktls_save_CFLAGS"
if test "X$thread_CFLAGS" != Xfailed; then
CFLAGS="$thread_CFLAGS $chktls_save_CFLAGS"
AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[#include <pthread.h>
__thread int a;
static int *a_in_other_thread;
static void *
thread_func (void *arg)
{
a_in_other_thread = &a;
return (void *)0;
}],
[pthread_t thread;
void *thread_retval;
int *a_in_main_thread;
if (pthread_create (&thread, (pthread_attr_t *)0,
thread_func, (void *)0))
return 0;
a_in_main_thread = &a;
if (pthread_join (thread, &thread_retval))
return 0;
return (a_in_other_thread == a_in_main_thread);])],
[have_tls=yes], [have_tls=no], [])
CFLAGS="$chktls_save_CFLAGS"
fi
fi],
[have_tls=no],
[AC_LINK_IFELSE([__thread int a; int b; int main() { return a = b; }],
[have_tls=yes], [have_tls=no])]
[dnl This is the cross-compiling case. Assume libc supports TLS if the
dnl binutils and the compiler do.
AC_LINK_IFELSE([__thread int a; int b; int main() { return a = b; }],
[have_tls=yes], [have_tls=no])
]
)])
if test "$enable_tls $have_tls" = "yes yes"; then
AC_DEFINE(HAVE_TLS, 1,