Merge branch 'versioned-symbols' into master

1 files changed, 59 insertions, 0 deletions

diff --git a/aclocal.m4 b/aclocal.m4
index e534f55b..debcf9c7 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1246,3 +1246,62 @@ ac_cv_type_int_fast32_t="$ac_cv_type_int_fast32_t"
 ac_cv_type_intmax_t="$ac_cv_type_intmax_t"
 ])
 ])
+
+# ld-version-script.m4 serial 3
+dnl Copyright (C) 2008-2014 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Simon Josefsson
+
+# FIXME: The test below returns a false positive for mingw
+# cross-compiles, 'local:' statements does not reduce number of
+# exported symbols in a DLL.  Use --disable-ld-version-script to work
+# around the problem.
+
+# gl_LD_VERSION_SCRIPT
+# --------------------
+# Check if LD supports linker scripts, and define automake conditional
+# HAVE_LD_VERSION_SCRIPT if so.
+AC_DEFUN([LD_VERSION_SCRIPT],
+[
+  AC_ARG_ENABLE([ld-version-script],
+    AS_HELP_STRING([--enable-ld-version-script],
+      [enable linker version script (default is enabled when possible)]),
+      [have_ld_version_script=$enableval], [])
+  if test -z "$have_ld_version_script"; then
+    AC_MSG_CHECKING([if LD -Wl,--version-script works])
+    save_LDFLAGS="$LDFLAGS"
+    LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
+    cat > conftest.map <<EOF
+foo
+EOF
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
+                   [accepts_syntax_errors=yes], [accepts_syntax_errors=no])
+    if test "$accepts_syntax_errors" = no; then
+      cat > conftest.map <<EOF
+VERS_1 {
+        global: sym;
+};
+
+VERS_2 {
+        global: sym;
+} VERS_1;
+EOF
+      AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
+                     [have_ld_version_script=yes], [have_ld_version_script=no])
+    else
+      have_ld_version_script=no
+    fi
+    rm -f conftest.map
+    LDFLAGS="$save_LDFLAGS"
+    AC_MSG_RESULT($have_ld_version_script)
+  fi
+  if test "$have_ld_version_script" = "yes";then
+	EXTRA_LINKER_FLAGS="-Wl,--version-script=libnettle.map"
+	AC_SUBST(EXTRA_LINKER_FLAGS)
+	EXTRA_HOGWEED_LINKER_FLAGS="-Wl,--version-script=libhogweed.map"
+	AC_SUBST(EXTRA_HOGWEED_LINKER_FLAGS)
+  fi
+])