Refactor and normalize generated build info source files * Makefile.am (build-info-commands): New macro to generate build info source files containing hg revision. * libgui/module.mk (EXTRA_libgui_liboctgui_la_SOURCES): Delete variable referencing unnecessary dummy source file. (libgui_liboctgui_la_CPPFLAGS, libgui_liboctgui_la_CFLAGS, libgui_liboctgui_la_CXXFLAGS): New compilation variables. (libgui_CLEANFILES, libgui_EXTRA_DIST, nodist_libgui_liboctgui_la_SOURCES, noinst_HEADERS): Include libgui/liboctgui-build-info.* files moved from libgui/src. (libgui/liboctgui-build-info.cc): Redefine rule moved from libgui/src/module.mk using $(build-info-commands). * libgui/src/module.mk (libgui_CLEANFILES, libgui_EXTRA_DIST, nodist_libgui_src_libgui_src_la_SOURCES, noinst_HEADERS): Remove libgui/src/liboctgui-build-info.* files moved to libgui. (libgui/src/liboctgui-build-info.cc): Delete rule. * libinterp/module.mk (libinterp/liboctinterp-build-info.cc): Redefine using $(build-info-commands). * liboctave/module.mk (EXTRA_liboctave_liboctave_la_SOURCES): Delete variable referencing unnecessary dummy source file. (liboctave/liboctave-build-info.cc): Redefine using $(build-info-commands). * src/module.mk (OCTAVE_GUI_CPPFLAGS): Include -I$(srcdir)/libgui in the list. (src/octave-build-info.cc): Redefine using $(build-info-commands). * libgui/liboctgui-build-info.h, libgui/liboctgui-build-info.in.cc: Move from libgui/src. * libgui/.dummy_force_cxx_link.cc, liboctave/.dummy_force_cxx_link.cc: Delete.

--- a/Makefile.am	Sat Apr 22 08:12:54 2017 -0400
+++ b/Makefile.am	Sat Apr 22 14:11:40 2017 -0700
@@ -456,6 +456,14 @@
   fi
 endef
 
+define build-info-commands
+  rm -f $@-t && \
+  $(SED) \
+    -e "s|%NO_EDIT_WARNING%|DO NOT EDIT!  Generated automatically by Makefile|" \
+    -e "s|%OCTAVE_HG_ID%|$(HG_ID_VAR)|" $< > $@-t && \
+  $(simple_move_if_change_rule)
+endef
+
 define simple-filter-rule
   rm -f $@-t $@ && \
   ${SHELL} $(1) < $< > $@-t && \