Add generic documentation

gcc/Make-lang.in

@@ -61,6 +61,14 @@ elna.rest.encap:
 # No elna-specific selftests.
 selftest-elna:
 
+ELNA_TEXI_FILES = \
+  elna/gcc/gelna.texi \
+  $(srcdir)/doc/include/fdl.texi \
+  $(srcdir)/doc/include/gpl_v3.texi \
+  $(srcdir)/doc/include/funding.texi \
+  $(srcdir)/doc/include/gcc-common.texi \
+  gcc-vers.texi
+
 elna.install-common: installdirs
 	-rm -f $(DESTDIR)$(bindir)/$(ELNA_INSTALL_NAME)$(exeext)
 	$(INSTALL_PROGRAM) gelna$(exeext) $(DESTDIR)$(bindir)/$(ELNA_INSTALL_NAME)$(exeext)
@@ -68,16 +76,38 @@ elna.install-common: installdirs
 	( cd $(DESTDIR)$(bindir) && \
       $(LN) $(ELNA_INSTALL_NAME)$(exeext) $(ELNA_TARGET_INSTALL_NAME)$(exeext) ); \
 
+$(build_htmldir)/gelna/index.html: $(ELNA_TEXI_FILES)
+	$(mkinstalldirs) $(@D)
+	rm -f $(@D)/*
+	$(TEXI2HTML) -I $(gcc_docdir)/include -I $(srcdir)/elna -o $(@D) $<
+
 # Required goals, they still do nothing
 elna.install-man:
 elna.install-info:
 elna.install-pdf:
 elna.install-plugin:
-elna.install-html:
+
+elna.install-html: $(build_htmldir)/gelna
+	@$(NORMAL_INSTALL)
+	test -z "$(htmldir)" || $(mkinstalldirs) "$(DESTDIR)$(htmldir)"
+	@for p in $(build_htmldir)/gelna; do \
+	  if test -f "$$p" || test -d "$$p"; then d=""; else d="$(srcdir)/"; fi; \
+	  f=$(html__strip_dir) \
+	  if test -d "$$d$$p"; then \
+	    echo " $(mkinstalldirs) '$(DESTDIR)$(htmldir)/$$f'"; \
+	    $(mkinstalldirs) "$(DESTDIR)$(htmldir)/$$f" || exit 1; \
+	    echo " $(INSTALL_DATA) '$$d$$p'/* '$(DESTDIR)$(htmldir)/$$f'"; \
+	    $(INSTALL_DATA) "$$d$$p"/* "$(DESTDIR)$(htmldir)/$$f"; \
+	  else \
+	    echo " $(INSTALL_DATA) '$$d$$p' '$(DESTDIR)$(htmldir)/$$f'"; \
+	    $(INSTALL_DATA) "$$d$$p" "$(DESTDIR)$(htmldir)/$$f"; \
+	  fi; \
+	done
+
 elna.info:
 elna.dvi:
 elna.pdf:
-elna.html:
+elna.html: $(build_htmldir)/gelna/index.html
 elna.man:
 elna.mostlyclean:
 elna.clean: