[librest/wip/teuf/gtask: 32/37] version script

[Christophe Fergeau <teuf src gnome org>]

commit 2825d489815c44a3a900074cf37f454944360b70
Author: Christophe Fergeau <cfergeau redhat com>
Date:   Wed Jun 15 17:54:13 2016 +0200

    version script

 build/ld-version.m4 |   34 ++++++++++++++++++++++++++++++++++
 configure.ac        |    2 ++
 rest/Makefile.am    |   26 +++++++++++++++++++++++++-
 3 files changed, 61 insertions(+), 1 deletions(-)
---
diff --git a/build/ld-version.m4 b/build/ld-version.m4
new file mode 100644
index 0000000..589fb71
--- /dev/null
+++ b/build/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])])
diff --git a/configure.ac b/configure.ac
index 4d92dfc..4f9d751 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,6 +40,8 @@ AM_PROG_CC_C_O
 LT_PREREQ([2.2.6])
 LT_INIT([disable-static])
 
+RRA_LD_VERSION_SCRIPT
+
 PKG_CHECK_MODULES(GLIB, glib-2.0 >= 2.38)
 PKG_CHECK_MODULES(SOUP, libsoup-2.4)
 PKG_CHECK_MODULES(XML, libxml-2.0)
diff --git a/rest/Makefile.am b/rest/Makefile.am
index 4df6ed4..d2eeca8 100644
--- a/rest/Makefile.am
+++ b/rest/Makefile.am
@@ -43,12 +43,20 @@ lib_headers = \
 EXTRA_DIST = \
        rest-marshal.txt
 
+if HAVE_LD_VERSION_SCRIPT
+LIBREST_SYMBOLS_LDFLAGS = -Wl,--version-script=${srcdir}/librest-map-file
+LIBREST_SYMBOLS_FILE = librest-map-file
+else
+LIBREST_SYMBOLS_LDFLAGS = -export-symbols ${srcdir}/librest-sym-file
+LIBREST_SYMBOLS_FILE = librest-sym-file
+endif
+
 lib_LTLIBRARIES = librest- API_VERSION@.la
 librest_ API_VERSION@_la_CFLAGS = $(GLIB_CFLAGS) $(GTHREAD_CFLAGS) \
                    $(SOUP_CFLAGS) $(SOUP_GNOME_CFLAGS) \
                    $(XML_CFLAGS) $(GCOV_CFLAGS) \
                    -I$(top_srcdir) -Wall -DG_LOG_DOMAIN=\"Rest\"
-librest_ API_VERSION@_la_LDFLAGS = -no-undefined
+librest_ API_VERSION@_la_LDFLAGS = -no-undefined $(LIBREST_SYMBOLS_LDFLAGS)
 librest_ API_VERSION@_la_LIBADD = $(GLIB_LIBS) $(GTHREAD_LIBS) \
                     $(SOUP_LIBS) $(SOUP_GNOME_LIBS) $(XML_LIBS) \
                    $(GCOV_LDFLAGS)
@@ -56,6 +64,7 @@ librest_ API_VERSION@_la_SOURCES = $(lib_sources) $(lib_headers)
 nodist_librest_ API_VERSION@_la_SOURCES = $(nodist_lib_sources)
 librest_ API_VERSION@_la_HEADERS = $(lib_headers)
 librest_ API_VERSION@_ladir = $(includedir)/rest- API_VERSION@/rest
+librest_ API_VERSION@_la_DEPENDENCIES = $(LIBREST_SYMBOLS_FILE)
 
 rest-enum-types.h: stamp-rest-enum-types.h
        @true
@@ -137,3 +146,18 @@ CLEANFILES += $(dist_gir_DATA) \
        $(NULL)
 
 endif # HAVE_INTROSPECTION
+
+# regeneration of symbol files
+update-map-file: $(lib_headers)
+       ( echo "LIBREST_1 {" ; \
+         echo "global:" ; \
+         ctags -f - -I G_GNUC_CONST --c-kinds=p $^ | awk '/^(rest_|oauth2_|oauth_)/ { print $$1 ";" }' | 
sort ; \
+         echo "local:" ;  \
+         echo "*;" ; \
+         echo "};" ) > $(srcdir)/librest-map-file
+
+update-sym-file: $(lib_headers)
+       ( ctags -f - -I G_GNUC_CONST --c-kinds=p $^ | awk '/^(rest_|oauth2_|oauth_)/ { print $$1 }' | sort ; \
+       ) > $(srcdir)/librest-sym-file
+
+update-symbol-files: update-map-file update-sym-file