diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index 68ff97a..74ffcea 100644 --- a/configure.ac +++ b/configure.ac @@ -77,11 +77,36 @@ else ]) fi -dnl Set up C warning flags. +dnl Set up C warning and visibility flags. if test "x$GCC" = xyes; then WARNCFLAGS="-Wall" + + # Enable -fvisibility=hidden if using a gcc that supports it + save_CFLAGS="$CFLAGS" + AC_MSG_CHECKING([whether $CC supports -fvisibility=hidden]) + VISIBILITY_CFLAGS="-fvisibility=hidden" + CFLAGS="$CFLAGS $VISIBILITY_CFLAGS" + AC_LINK_IFELSE([AC_LANG_PROGRAM()], AC_MSG_RESULT([yes]), + [VISIBILITY_CFLAGS=""; AC_MSG_RESULT([no])]); + + # Restore CFLAGS; VISIBILITY_CFLAGS are added to it where needed. + CFLAGS=$save_CFLAGS + if test "x$GXX" = xyes; then WARNCXXFLAGS="-Wall" + + # Enable -fvisibility=hidden if using a gcc that supports it + save_CXXFLAGS="$CXXFLAGS" + AC_MSG_CHECKING([whether $CXX supports -fvisibility=hidden]) + VISIBILITY_CXXFLAGS="-fvisibility=hidden" + CXXFLAGS="$CXXFLAGS $VISIBILITY_CXXFLAGS" + AC_LANG_PUSH([C++]) + AC_LINK_IFELSE([AC_LANG_PROGRAM()], AC_MSG_RESULT([yes]), + [VISIBILITY_CXXFLAGS=""; AC_MSG_RESULT([no])]); + AC_LANG_POP([C++]) + + # Restore CXXFLAGS; VISIBILITY_CXXFLAGS are added to it where needed. + CXXFLAGS=$save_CXXFLAGS fi else AC_CHECK_DECL([__SUNPRO_C], [SUNCC="yes"], [SUNCC="no"]) @@ -92,6 +117,8 @@ else fi AC_SUBST([WARNCFLAGS]) AC_SUBST([WARNCXXFLAGS]) +AC_SUBST([VISIBILITY_CFLAGS]) +AC_SUBST([VISIBILITY_CXXFLAGS]) AC_OUTPUT([ Makefile |