| Line 1... |
Line 1... |
dnl Check whether the target supports TLS.
|
dnl Check whether the target supports TLS.
|
AC_DEFUN([GCC_CHECK_TLS], [
|
AC_DEFUN([GCC_CHECK_TLS], [
|
|
AC_REQUIRE([AC_CANONICAL_HOST])
|
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],
|
gcc_cv_have_tls, [
|
gcc_cv_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.
|
chktls_save_LDFLAGS="$LDFLAGS"
|
chktls_save_LDFLAGS="$LDFLAGS"
|
LDFLAGS="-static $LDFLAGS"
|
LDFLAGS="-static $LDFLAGS"
|
AC_LINK_IFELSE([int main() { return 0; }],
|
AC_LINK_IFELSE([int main() { return 0; }],
|
AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
|
[AC_RUN_IFELSE([__thread int a; int b; int main() { return a = b; }],
|
[gcc_cv_have_tls=yes], [gcc_cv_have_tls=no],[]),
|
[gcc_cv_have_tls=yes], [gcc_cv_have_tls=no],[])],
|
[gcc_cv_have_tls=yes])
|
[gcc_cv_have_tls=yes])
|
LDFLAGS="$chktls_save_LDFLAGS"
|
LDFLAGS="$chktls_save_LDFLAGS"
|
if test $gcc_cv_have_tls = yes; then
|
if test $gcc_cv_have_tls = yes; then
|
dnl So far, the binutils and the compiler support TLS.
|
dnl So far, the binutils and the compiler support TLS.
|
dnl Also check whether the libc supports TLS, i.e. whether a variable
|
dnl Also check whether the libc supports TLS, i.e. whether a variable
|
| Line 64... |
Line 65... |
fi],
|
fi],
|
[gcc_cv_have_tls=no],
|
[gcc_cv_have_tls=no],
|
[dnl This is the cross-compiling case. Assume libc supports TLS if the
|
[dnl This is the cross-compiling case. Assume libc supports TLS if the
|
dnl binutils and the compiler do.
|
dnl binutils and the compiler do.
|
AC_LINK_IFELSE([__thread int a; int b; int main() { return a = b; }],
|
AC_LINK_IFELSE([__thread int a; int b; int main() { return a = b; }],
|
[gcc_cv_have_tls=yes], [gcc_cv_have_tls=no])
|
[chktls_save_LDFLAGS="$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 $gcc_cv_have_tls" = "yes yes"; then
|
if test "$enable_tls $gcc_cv_have_tls" = "yes yes"; then
|
AC_DEFINE(HAVE_TLS, 1,
|
AC_DEFINE(HAVE_TLS, 1,
|
[Define to 1 if the target supports thread-local storage.])
|
[Define to 1 if the target supports thread-local storage.])
|
fi])
|
fi])
|
|
|
dnl Check whether the target assembler supports TLS.
|
dnl Check whether the target assembler supports TLS.
|
AC_DEFUN([GCC_CHECK_CC_TLS], [
|
AC_DEFUN([GCC_CHECK_CC_TLS], [
|
GCC_ENABLE(tls, yes, [], [Use thread-local storage])
|
GCC_ENABLE(tls, yes, [], [Use thread-local storage])
|
AC_CACHE_CHECK([whether the target asssembler upports thread-local storage],
|
AC_CACHE_CHECK([whether the target assembler supports thread-local storage],
|
gcc_cv_have_cc_tls, [
|
gcc_cv_have_cc_tls, [
|
AC_COMPILE_IFELSE([__thread int a; int b; int main() { return a = b; }],
|
AC_COMPILE_IFELSE([__thread int a; int b; int main() { return a = b; }],
|
[gcc_cv_have_cc_tls=yes], [gcc_cv_have_cc_tls=no])]
|
[gcc_cv_have_cc_tls=yes], [gcc_cv_have_cc_tls=no])]
|
)])
|
)])
|
if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
|
if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
|
AC_DEFINE(HAVE_CC_TLS, 1,
|
AC_DEFINE(HAVE_CC_TLS, 1,
|
[Define to 1 if the target assembler supports thread-local storage.])
|
[Define to 1 if the target assembler supports thread-local storage.])
|
fi])
|
fi])
|
|
|
No newline at end of file
|
No newline at end of file
|
|
dnl Check whether TLS is emulated.
|
|
AC_DEFUN([GCC_CHECK_EMUTLS], [
|
|
AC_CACHE_CHECK([whether the thread-local storage support is from emutls],
|
|
gcc_cv_use_emutls, [
|
|
gcc_cv_use_emutls=no
|
|
echo '__thread int a; int b; int main() { return a = b; }' > conftest.c
|
|
if AC_TRY_COMMAND(${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])
|
|
|
No newline at end of file
|
No newline at end of file
|
