From f7933f61b2ff10b34b661b2be815529e40223d1c Mon Sep 17 00:00:00 2001
From: cvs2svn <>
Date: Sat, 25 Jul 2009 14:58:56 +0000
Subject: This commit was manufactured by cvs2svn to create branch 'msnyder-
 checkpoint-072509-branch'.

Sprout from dje-cgen-play1-branch 2009-06-26 17:19:08 UTC cvs2svn 'This commit was manufactured by cvs2svn to create branch 'dje-cgen-'
Cherrypick from master 2009-07-25 14:58:55 UTC H.J. Lu <hjl.tools@gmail.com> 'bfd/':
    ChangeLog
    config/ChangeLog
    config/tls.m4
    configure
    configure.ac
    djunpack.bat
    include/ChangeLog
    include/demangle.h
    include/dwarf2.h
    include/elf/ChangeLog
    include/elf/common.h
    include/elf/ppc.h
    include/elf/ppc64.h
    include/elf/spu.h
    include/libiberty.h
Delete:
    include/elf/dwarf2.h
---
 config/tls.m4 | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

(limited to 'config/tls.m4')

diff --git a/config/tls.m4 b/config/tls.m4
index acb123f69..0ae60460b 100644
--- a/config/tls.m4
+++ b/config/tls.m4
@@ -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
-- 
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