Only use visibility if supported

	* configure.ac (libcilkrts_cv_have_attribute_visibility): Check
	for __attribute__((visibility)).
	* configure: Regenerate.
	* include/cilk/common.h (CILK_EXPORT, CILK_EXPORT_DATA): Only use
	__attribute__((visibility)) if HAVE_ATTRIBUTE_VISIBILITY.

From-SVN: r205254

diff --git a/libcilkrts/ChangeLog b/libcilkrts/ChangeLog
index c73b9233850db9cacf5f6fc29092de35daf859d2..abcd198a63591c661cde7b8949414a791024c0ff 100644 (file)
--- a/libcilkrts/ChangeLog
+++ b/libcilkrts/ChangeLog
@@ -1,3 +1,11 @@
+2013-11-22  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+       * configure.ac (libcilkrts_cv_have_attribute_visibility): Check
+       for __attribute__((visibility)).
+       * configure: Regenerate.
+       * include/cilk/common.h (CILK_EXPORT, CILK_EXPORT_DATA): Only use
+       __attribute__((visibility)) if HAVE_ATTRIBUTE_VISIBILITY.
+
 2013-11-22  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
        * configure.ac (AC_PROG_CXX): Move after AC_PROG_CC.

diff --git a/libcilkrts/configure b/libcilkrts/configure
index c510e14c7174ffbe1575fc9837034fb176757ed0..d60ac410a832efcecac38927f2180a5a14a371ba 100644 (file)
--- a/libcilkrts/configure
+++ b/libcilkrts/configure
@@ -4874,6 +4874,33 @@ _ACEOF
 fi
 
 
+# Check whether the target supports protected visibility.
+save_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -Werror"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+void __attribute__((visibility("protected"))) foo(void) { }
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libcilkrts_cv_have_attribute_visibility=yes
+else
+  libcilkrts_cv_have_attribute_visibility=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+CFLAGS="$save_CFLAGS"
+if test $libcilkrts_cv_have_attribute_visibility = yes; then
+
+$as_echo "#define HAVE_ATTRIBUTE_VISIBILITY 1" >>confdefs.h
+
+fi
+
 # Get target configury.
 . ${srcdir}/configure.tgt
 if test -n "$UNSUPPORTED"; then
@@ -11060,7 +11087,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11063 "configure"
+#line 11090 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11166,7 +11193,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11169 "configure"
+#line 11196 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H

diff --git a/libcilkrts/configure.ac b/libcilkrts/configure.ac
index 0332d9c552ddf9388b525afd4d80df76e4f6445a..84588db4224c1106cfc7f958aab9c8177a17689e 100644 (file)
--- a/libcilkrts/configure.ac
+++ b/libcilkrts/configure.ac
@@ -54,6 +54,18 @@ AC_CONFIG_FILES([Makefile])
 AM_ENABLE_MULTILIB(, ..)
 AC_FUNC_ALLOCA
 
+# Check whether the target supports protected visibility.
+save_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -Werror"
+AC_TRY_COMPILE([void __attribute__((visibility("protected"))) foo(void) { }],
+              [], libcilkrts_cv_have_attribute_visibility=yes,
+              libcilkrts_cv_have_attribute_visibility=no)
+CFLAGS="$save_CFLAGS"
+if test $libcilkrts_cv_have_attribute_visibility = yes; then
+  AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1,
+    [Define to 1 if the target supports __attribute__((visibility(...))).])
+fi
+
 # Get target configury.
 . ${srcdir}/configure.tgt
 if test -n "$UNSUPPORTED"; then

diff --git a/libcilkrts/include/cilk/common.h b/libcilkrts/include/cilk/common.h
index 8ec19afa9222e88ea3ddc8374016d79659981647..d2c84fa95a20d31efa4677585ff04fa8665bd8da 100644 (file)
--- a/libcilkrts/include/cilk/common.h
+++ b/libcilkrts/include/cilk/common.h
@@ -101,7 +101,7 @@ namespace cilk {
 #   define CILK_EXPORT      /* nothing */
 #   define CILK_EXPORT_DATA /* nothing */
 #else /* Unix/gcc */
-#   ifdef IN_CILK_RUNTIME
+#   if defined(IN_CILK_RUNTIME) && defined(HAVE_ATTRIBUTE_VISIBILITY)
 #       define CILK_EXPORT      __attribute__((visibility("protected")))
 #       define CILK_EXPORT_DATA __attribute__((visibility("protected")))
 #   else