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Diffstat (limited to 'm4/odp_visibility.m4')
| -rw-r--r-- | m4/odp_visibility.m4 | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/m4/odp_visibility.m4 b/m4/odp_visibility.m4 new file mode 100644 index 000000000..9edba1f43 --- /dev/null +++ b/m4/odp_visibility.m4 @@ -0,0 +1,25 @@ +# SPDX-License-Identifier: BSD-3-Clause +# Copyright (c) 2017 Linaro Limited +# + +# ODP_VISIBILITY +# -------------- +# Enable -fvisibility=hidden if using a gcc that supports it + +AC_DEFUN([ODP_VISIBILITY], [dnl +VISIBILITY_CFLAGS="-fvisibility=hidden" +AC_CACHE_CHECK([whether $CC supports -fvisibility=hidden], + [odp_cv_visibility_hidden], [dnl +OLD_CFLAGS="$CFLAGS" +CFLAGS="$CFLAGS $VISIBILITY_CFLAGS" +AC_LINK_IFELSE([AC_LANG_PROGRAM()], [odp_cv_visibility_hidden=yes], + [odp_cv_visibility_hidden=no]) +CFLAGS=$OLD_CFLAGS +]) + +if test "x$odp_cv_visibility_hidden" != "xyes" ; then + VISIBILITY_CFLAGS="" +fi + +AC_SUBST(VISIBILITY_CFLAGS) +]) # ODP_VISIBILITY |