mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-09 04:21:49 +08:00
89 lines
3.3 KiB
Plaintext
89 lines
3.3 KiB
Plaintext
dnl Check whether the target supports TLS.
|
|
AC_DEFUN([GCC_CHECK_TLS], [
|
|
GCC_ENABLE(tls, yes, [], [Use thread-local storage])
|
|
AC_CACHE_CHECK([whether the target supports thread-local storage],
|
|
gcc_cv_have_tls, [
|
|
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 static linking, but only if static linking is supported (not
|
|
dnl on Solaris 10). This fails with some older Red Hat releases.
|
|
chktls_save_LDFLAGS="$LDFLAGS"
|
|
LDFLAGS="-static $LDFLAGS"
|
|
AC_LINK_IFELSE([int main() { return 0; }],
|
|
AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
|
|
[gcc_cv_have_tls=yes], [gcc_cv_have_tls=no],[]),
|
|
[gcc_cv_have_tls=yes])
|
|
LDFLAGS="$chktls_save_LDFLAGS"
|
|
if test $gcc_cv_have_tls = yes; then
|
|
dnl So far, the binutils and the compiler support TLS.
|
|
dnl Also check whether the libc supports TLS, i.e. whether a variable
|
|
dnl with __thread linkage has a different address in different threads.
|
|
dnl First, find the thread_CFLAGS necessary for linking a program that
|
|
dnl calls pthread_create.
|
|
chktls_save_CFLAGS="$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 $chktls_save_CFLAGS"
|
|
AC_RUN_IFELSE(
|
|
[AC_LANG_PROGRAM(
|
|
[#include <pthread.h>
|
|
__thread int a;
|
|
static int *a_in_other_thread;
|
|
static void *
|
|
thread_func (void *arg)
|
|
{
|
|
a_in_other_thread = &a;
|
|
return (void *)0;
|
|
}],
|
|
[pthread_t thread;
|
|
void *thread_retval;
|
|
int *a_in_main_thread;
|
|
if (pthread_create (&thread, (pthread_attr_t *)0,
|
|
thread_func, (void *)0))
|
|
return 0;
|
|
a_in_main_thread = &a;
|
|
if (pthread_join (thread, &thread_retval))
|
|
return 0;
|
|
return (a_in_other_thread == a_in_main_thread);])],
|
|
[gcc_cv_have_tls=yes], [gcc_cv_have_tls=no], [])
|
|
CFLAGS="$chktls_save_CFLAGS"
|
|
fi
|
|
fi],
|
|
[gcc_cv_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; }],
|
|
[gcc_cv_have_tls=yes], [gcc_cv_have_tls=no])
|
|
]
|
|
)])
|
|
if test "$enable_tls $gcc_cv_have_tls" = "yes yes"; then
|
|
AC_DEFINE(HAVE_TLS, 1,
|
|
[Define to 1 if the target supports thread-local storage.])
|
|
fi])
|
|
|
|
dnl Check whether the target assembler supports TLS.
|
|
AC_DEFUN([GCC_CHECK_CC_TLS], [
|
|
GCC_ENABLE(tls, yes, [], [Use thread-local storage])
|
|
AC_CACHE_CHECK([whether the target asssembler upports thread-local storage],
|
|
gcc_cv_have_cc_tls, [
|
|
AC_COMPILE_IFELSE([__thread int a; int b; int main() { return a = b; }],
|
|
[gcc_cv_have_cc_tls=yes], [gcc_cv_have_cc_tls=no])]
|
|
)])
|
|
if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
|
|
AC_DEFINE(HAVE_CC_TLS, 1,
|
|
[Define to 1 if the target assembler supports thread-local storage.])
|
|
fi])
|