gtk: hide unwanted public symbols

1 files changed, 34 insertions, 0 deletions

diff --git a/m4/ld-version.m4 b/m4/ld-version.m4
new file mode 100644
index 0000000..589fb71
--- /dev/null
+++ b/m4/ld-version.m4
@@ -0,0 +1,34 @@
+dnl Check whether the linker supports --version-script.
+dnl
+dnl Probes whether the linker supports --version-script with a simple version
+dnl script that only defines a single version.  Sets the Automake conditional
+dnl HAVE_LD_VERSION_SCRIPT based on whether it is supported.
+dnl
+dnl Written by Russ Allbery <rra@stanford.edu>
+dnl Based on the gnulib ld-version-script macro from Simon Josefsson
+dnl Copyright 2010 Board of Trustees, Leland Stanford Jr. University
+dnl Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
+dnl
+dnl This file is free software; the Free Software Foundation gives unlimited
+dnl permission to copy and/or distribute it, with or without modifications, as
+dnl long as this notice is preserved.
+
+AC_DEFUN([RRA_LD_VERSION_SCRIPT],
+[AC_CACHE_CHECK([if -Wl,--version-script works], [rra_cv_ld_version_script],
+    [save_LDFLAGS="$LDFLAGS"
+     LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
+     cat > conftest.map <<EOF
+VERSION_1 {
+    global:
+        sym;
+
+    local:
+        *;
+};
+EOF
+     AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
+        [rra_cv_ld_version_script=yes], [rra_cv_ld_version_script=no])
+     rm -f conftest.map
+     LDFLAGS="$save_LDFLAGS"])
+ AM_CONDITIONAL([HAVE_LD_VERSION_SCRIPT],
+    [test x"$rra_cv_ld_version_script" = xyes])])