dnl Check whether the target supports TLS.
AC_DEFUN([GCC_CHECK_TLS], [
+ AC_REQUIRE([AC_CANONICAL_HOST])
GCC_ENABLE(tls, yes, [], [Use thread-local storage])
AC_CACHE_CHECK([whether the target supports thread-local storage],
- have_tls, [
+ 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.
- 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"],
- [have_tls=no],
- [AC_LINK_IFELSE([__thread int a; int b; int main() { return a = b; }],
- [have_tls=yes], [have_tls=no])]
+ [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 $chktls_save_CFLAGS"
+ dnl Test for an old glibc bug that violated the __thread property.
+ dnl Use volatile to ensure the compiler won't optimize away pointer
+ dnl accesses it might otherwise assume to be redundant, or reorder
+ dnl them and reuse storage, which might lead to them pointing to
+ dnl the same location.
+ AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM(
+ [#include <pthread.h>
+ __thread int a;
+ static int *volatile a_in_other_thread;
+ static void *
+ thread_func (void *arg)
+ {
+ a_in_other_thread = &a;
+ return (void *)0;
+ }],
+ [pthread_t thread;
+ void *thread_retval;
+ int *volatile a_in_main_thread;
+ a_in_main_thread = &a;
+ if (pthread_create (&thread, (pthread_attr_t *)0,
+ thread_func, (void *)0))
+ return 0;
+ if (pthread_join (thread, &thread_retval))
+ return 0;
+ return (a_in_other_thread == a_in_main_thread);])],
+ [gcc_cv_have_tls=yes], [gcc_cv_have_tls=no], [])
+ CFLAGS="$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; }],
+ [chktls_save_LDFLAGS="$LDFLAGS"
+ dnl Shared library options may depend on the host; this check
+ dnl is only known to be needed for GNU/Linux.
+ case $host in
+ *-*-linux*)
+ LDFLAGS="-shared -Wl,--no-undefined $LDFLAGS"
+ ;;
+ esac
+ chktls_save_CFLAGS="$CFLAGS"
+ CFLAGS="-fPIC $CFLAGS"
+ dnl If -shared works, test if TLS works in a shared library.
+ AC_LINK_IFELSE([int f() { return 0; }],
+ [AC_LINK_IFELSE([__thread int a; int b; int f() { return a = b; }],
+ [gcc_cv_have_tls=yes],
+ [gcc_cv_have_tls=no])],
+ [gcc_cv_have_tls=yes])
+ CFLAGS="$chktls_save_CFLAGS"
+ LDFLAGS="$chktls_save_LDFLAGS"], [gcc_cv_have_tls=no])
+ ]
)])
- if test "$enable_tls $have_tls" = "yes yes"; then
+ if test "$enable_tls $gcc_cv_have_tls" = "yes yes"; then
AC_DEFINE(HAVE_TLS, 1,
[Define to 1 if the target supports thread-local storage.])
fi])
+
+dnl Check whether the target assembler supports TLS.
+AC_DEFUN([GCC_CHECK_CC_TLS], [
+ GCC_ENABLE(tls, yes, [], [Use thread-local storage])
+ AC_CACHE_CHECK([whether the target assembler supports thread-local storage],
+ gcc_cv_have_cc_tls, [
+ AC_COMPILE_IFELSE([__thread int a; int b; int main() { return a = b; }],
+ [gcc_cv_have_cc_tls=yes], [gcc_cv_have_cc_tls=no])]
+ )])
+ if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
+ AC_DEFINE(HAVE_CC_TLS, 1,
+ [Define to 1 if the target assembler supports thread-local storage.])
+ fi])
+
+dnl Check whether TLS is emulated.
+AC_DEFUN([GCC_CHECK_EMUTLS], [
+ AC_CACHE_CHECK([whether the thread-local storage support is from emutls],
+ gcc_cv_use_emutls, [
+ gcc_cv_use_emutls=no
+ echo '__thread int a; int b; int main() { return a = b; }' > conftest.c
+ if AC_TRY_COMMAND(${CC-cc} -Werror -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD); then
+ if grep __emutls_get_address conftest.s > /dev/null; then
+ gcc_cv_use_emutls=yes
+ fi
+ fi
+ rm -f conftest.*
+ ])
+ if test "$gcc_cv_use_emutls" = "yes" ; then
+ AC_DEFINE(USE_EMUTLS, 1,
+ [Define to 1 if the target use emutls for thread-local storage.])
+ fi])
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