[network-manager-openvpn: 11/14] build: add linker version script for executables

[Thomas Haller <thaller src gnome org>]

commit a0a855e4739011e6fadfa933f08872f8c5f6bbe6
Author: Thomas Haller <thaller redhat com>
Date:   Sun Feb 12 12:31:42 2017 +0100

    build: add linker version script for executables
    
    It allows --gc-sections to prune unused symbols.

 Makefile.am              |   13 +++++++++++++
 linker-script-binary.ver |    6 ++++++
 2 files changed, 19 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index fda81d4..49bc04b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -67,18 +67,26 @@ src_nm_openvpn_service_SOURCES = \
        src/nm-openvpn-service.c \
        src/nm-openvpn-service.h
 src_nm_openvpn_service_CPPFLAGS = $(src_cppflags)
+src_nm_openvpn_service_LDFLAGS = \
+       -Wl,--version-script="$(srcdir)/linker-script-binary.ver"
 src_nm_openvpn_service_LDADD = \
        src/libnm-utils.la \
        $(GLIB_LIBS) \
        $(LIBNM_LIBS)
+EXTRA_src_nm_openvpn_service_DEPENDENCIES = \
+       linker-script-binary.ver
 
 libexec_PROGRAMS += src/nm-openvpn-service-openvpn-helper
 
 src_nm_openvpn_service_openvpn_helper_CPPFLAGS = $(src_cppflags)
+src_nm_openvpn_service_openvpn_helper_LDFLAGS = \
+       -Wl,--version-script="$(srcdir)/linker-script-binary.ver"
 src_nm_openvpn_service_openvpn_helper_LDADD = \
        src/libnm-utils.la \
        $(GLIB_LIBS) \
        $(LIBNM_LIBS)
+EXTRA_src_nm_openvpn_service_openvpn_helper_DEPENDENCIES = \
+       linker-script-binary.ver
 
 ###############################################################################
 
@@ -316,12 +324,16 @@ auth_dialog_nm_openvpn_auth_dialog_CPPFLAGS = \
        $(LIBNM_CFLAGS) \
        $(LIBNMA_CFLAGS) \
        $(LIBSECRET_CFLAGS)
+auth_dialog_nm_openvpn_auth_dialog_LDFLAGS = \
+       -Wl,--version-script="$(srcdir)/linker-script-binary.ver"
 auth_dialog_nm_openvpn_auth_dialog_LDADD = \
        $(GLIB_LIBS) \
        $(GTK_LIBS) \
        $(LIBNM_LIBS) \
        $(LIBNMA_LIBS) \
        $(LIBSECRET_LIBS)
+EXTRA_auth_dialog_nm_openvpn_auth_dialog_DEPENDENCIES = \
+       linker-script-binary.ver
 
 ###############################################################################
 
@@ -359,6 +371,7 @@ noinst_PROGRAMS += $(check_programs)
 TESTS = $(check_programs)
 
 EXTRA_DIST += \
+       linker-script-binary.ver \
        nm-openvpn-service.name.in \
        $(dbusservice_DATA) \
        $(appdata_in_files) \
diff --git a/linker-script-binary.ver b/linker-script-binary.ver
new file mode 100644
index 0000000..a2780c0
--- /dev/null
+++ b/linker-script-binary.ver
@@ -0,0 +1,6 @@
+{
+global:
+       _IO_stdin_used;
+local:
+       *;
+};