[4.8, 4.9] Fix crash of omp loops that are not in the main thread.

Issue happens only when gcc is configured with "--disable-tls".
Backport from trunk for fixing PR42616

2014-12-09  Varvara Rainchik  <varvara.rainchik@intel.com>

  * config.h.in: Regenerate.
  * configure: Regenerate.
  * configure.ac: Add GCC_CHECK_EMUTLS.
  * libgomp.h: Add check for USE_EMUTLS: this case
    is equal to HAVE_TLS.
  * team.c: Likewise.

Change-Id: Iee574d1a7888b3bcbd01718669eac34fdd116abb
Signed-off-by: Alexander Ivchenko <alexander.ivchenko@intel.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/gcc-4.9/libgomp/configure b/gcc-4.9/libgomp/configure
index 39bb5cd..784e69f 100755
--- a/gcc-4.9/libgomp/configure
+++ b/gcc-4.9/libgomp/configure
@@ -15535,6 +15535,37 @@ $as_echo "#define HAVE_TLS 1" >>confdefs.h
 
   fi
 
+# See if we have emulated thread-local storage.
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the thread-local storage support is from emutls" >&5
+$as_echo_n "checking whether the thread-local storage support is from emutls... " >&6; }
+if test "${gcc_cv_use_emutls+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+    gcc_cv_use_emutls=no
+    echo '__thread int a; int b; int main() { return a = b; }' > conftest.c
+    if { ac_try='${CC-cc} -Werror -S -o conftest.s conftest.c 1>&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then
+      if grep __emutls_get_address conftest.s > /dev/null; then
+	gcc_cv_use_emutls=yes
+      fi
+    fi
+    rm -f conftest.*
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_use_emutls" >&5
+$as_echo "$gcc_cv_use_emutls" >&6; }
+  if test "$gcc_cv_use_emutls" = "yes" ; then
+
+$as_echo "#define USE_EMUTLS 1" >>confdefs.h
+
+  fi
+
 # See what sort of export controls are available.
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the target supports hidden visibility" >&5