+dnl CF_WITH_VERSIONED_SYMS version: 4 updated: 2015/01/21 20:10:54
+dnl ----------------------
+dnl Use this when building shared library with ELF, to markup symbols with the
+dnl version identifier from the given input file. Generally that identifier is
+dnl the same as the SONAME at which the symbol was first introduced.
+dnl
+dnl $1 = basename of the ".map" file (default $PACKAGE)
+AC_DEFUN([CF_WITH_VERSIONED_SYMS],
+[
+AC_MSG_CHECKING(if versioned-symbols file should be used)
+AC_ARG_WITH(versioned-syms,
+ [ --with-versioned-syms=X markup versioned symbols using ld],
+ [with_versioned_syms=$withval],
+ [with_versioned_syms=no])
+if test "x$with_versioned_syms" = xyes
+then
+ with_versioned_syms='${top_srcdir}/package/ifelse($1,,${PACKAGE},[$1]).map'
+ AC_SUBST(PACKAGE)
+fi
+AC_MSG_RESULT($with_versioned_syms)
+
+RESULTING_SYMS=
+VERSIONED_SYMS=
+WILDCARD_SYMS=
+
+if test "x$with_versioned_syms" != xno
+then
+ RESULTING_SYMS=$with_versioned_syms
+ case "x$MK_SHARED_LIB" in
+ *-Wl,*) #(vi
+ VERSIONED_SYMS="-Wl,--version-script,\${RESULTING_SYMS}"
+ MK_SHARED_LIB=`echo "$MK_SHARED_LIB" | sed -e "s%-Wl,%\\[$]{VERSIONED_SYMS} -Wl,%"`
+ CF_VERBOSE(MK_SHARED_LIB: $MK_SHARED_LIB)
+ ;;
+ *-dy\ *) #(vi
+ VERSIONED_SYMS="-Wl,-M,\${RESULTING_SYMS}"
+ MK_SHARED_LIB=`echo "$MK_SHARED_LIB" | sed -e "s%-dy%\\[$]{VERSIONED_SYMS} -dy%"`
+ CF_VERBOSE(MK_SHARED_LIB: $MK_SHARED_LIB)
+ ;;
+ *)
+ AC_MSG_WARN(this system does not support versioned-symbols)
+ ;;
+ esac
+
+ # Linux ld can selectively override scope, e.g., of symbols beginning with
+ # "_" by first declaring some as global, and then using a wildcard to
+ # declare the others as local. Some other loaders cannot do this. Check
+ # by constructing a (very) simple shared library and inspecting its
+ # symbols.
+ if test "x$VERSIONED_SYMS" != "x"
+ then
+ AC_MSG_CHECKING(if wildcards can be used to selectively omit symbols)
+ WILDCARD_SYMS=no
+
+ # make sources
+ rm -f conftest.*
+
+ cat >conftest.ver <<EOF
+module_1.0 {
+global:
+ globalf1;
+local:
+ localf1;
+};
+module_2.0 {
+global:
+ globalf2;
+local:
+ localf2;
+ _*;
+} module_1.0;
+submodule_1.0 {
+global:
+ subglobalf1;
+ _ismissing;
+local:
+ sublocalf1;
+};
+submodule_2.0 {
+global:
+ subglobalf2;
+local:
+ sublocalf2;
+ _*;
+} submodule_1.0;
+EOF
+ cat >conftest.$ac_ext <<EOF
+#line __oline__ "configure"
+int _ismissing(void) { return 1; }
+int _localf1(void) { return 1; }
+int _localf2(void) { return 2; }
+int globalf1(void) { return 1; }
+int globalf2(void) { return 2; }
+int _sublocalf1(void) { return 1; }
+int _sublocalf2(void) { return 2; }
+int subglobalf1(void) { return 1; }
+int subglobalf2(void) { return 2; }
+EOF
+ cat >conftest.mk <<EOF
+CC=${CC}
+CFLAGS=${CFLAGS}
+CPPFLAGS=${CPPFLAGS}
+LDFLAGS=${LDFLAGS}
+LIBS=${LIBS}
+VERSIONED_SYMS=${VERSIONED_SYMS}
+RESULTING_SYMS=conftest.ver
+MK_SHARED_LIB=${MK_SHARED_LIB}
+conftest.so: conftest.$ac_cv_objext
+ \$(MK_SHARED_LIB) conftest.$ac_cv_objext
+EOF
+
+ # compile source, make library
+ if make -f conftest.mk 2>&AC_FD_CC >/dev/null
+ then
+ # test for missing symbol
+ cf_missing=`nm -P conftest.so 2>&AC_FD_CC |fgrep _ismissing | egrep '[[ ]]T[[ ]]'`
+ test -n "$cf_missing" && WILDCARD_SYMS=yes
+ fi
+ AC_MSG_RESULT($WILDCARD_SYMS)
+ rm -f conftest.*
+ fi
+fi
+AC_SUBST(RESULTING_SYMS)
+AC_SUBST(VERSIONED_SYMS)
+AC_SUBST(WILDCARD_SYMS)
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_XOPEN_SOURCE version: 48 updated: 2014/09/01 12:29:14