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* tls.m4 (GCC_CHECK_TLS): Also test TLS in a shared library when 

cross-compiling.
This commit is contained in:
Joseph Myers 2009-07-16 23:21:15 +00:00
parent d6f45fb002
commit b7735ec72d
2 changed files with 24 additions and 1 deletions
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5
config/ChangeLog
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@ -1,3 +1,8 @@
2009-07-16 Joseph Myers <joseph@codesourcery.com>
* tls.m4 (GCC_CHECK_TLS): Also test TLS in a shared library when
cross-compiling.
2009-05-26 Rafael Avila de Espindola <espindola@google.com>
* plugins.m4: New.

20
config/tls.m4
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@ -1,5 +1,6 @@
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],
gcc_cv_have_tls, [
@ -66,7 +67,24 @@ AC_DEFUN([GCC_CHECK_TLS], [
[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])
[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