[PATCH libnetfilter_queue v2 5/5] build: doc: Allow to specify whether to produce man pages, html, neither or both

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- configure --help lists non-default documentation options.
  Looking around the web, this seemed to me to be what most projects do.
  Listed options are --without-doxygen, --enable-html-doc &
  --disable-man-pages.
- configure warns on inconsistent options e.g. --without-doxygen by itself
  warns man pages will not be built.
- configure.ac re-ordered so --without-doxygen overrides --enable-any-doc.
If html is requested, `make install` installs it in htmldir.

Signed-off-by: Duncan Roe <duncan_roe@xxxxxxxxxxxxxxx>
---
 configure.ac           | 41 ++++++++++++++++++++++++++++++++++++-----
 doxygen/Makefile.am    | 11 ++++++++++-
 doxygen/doxygen.cfg.in |  3 ++-
 3 files changed, 48 insertions(+), 7 deletions(-)

diff --git a/configure.ac b/configure.ac
index 4721eeb..a4fb629 100644
--- a/configure.ac
+++ b/configure.ac
@@ -13,6 +13,35 @@ m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 dnl kernel style compile messages
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
+dnl Must check for --without-doxygen before  checking --enable-*
+AC_ARG_WITH([doxygen], [AS_HELP_STRING([--without-doxygen],
+	    [Don't run doxygen (to create documentation)])],
+	    [with_doxygen="$withval"], [with_doxygen=yes])
+
+AC_ARG_ENABLE([html-doc],
+	      AS_HELP_STRING([--enable-html-doc], [Enable html documentation]),
+	      [], [enable_html_doc=no])
+AS_IF([test "$with_doxygen" = no -a "$enable_html_doc" = yes], [
+	AC_MSG_WARN([Doxygen disabled - html documentation will not be built])
+	enable_html_doc=no
+])
+AM_CONDITIONAL([BUILD_HTML], [test "$enable_html_doc" = yes])
+AS_IF([test "$enable_html_doc" = yes],
+	[AC_SUBST(GEN_HTML, YES)],
+	[AC_SUBST(GEN_HTML, NO)])
+
+AC_ARG_ENABLE([man-pages],
+	      AS_HELP_STRING([--disable-man-pages], [Disable man page documentation]),
+	      [], [enable_man_pages=yes])
+AS_IF([test "$with_doxygen" = no -a "$enable_man_pages" = yes], [
+	AC_MSG_WARN([Doxygen disabled - man pages will not be built])
+	enable_man_pages=no
+])
+AM_CONDITIONAL([BUILD_MAN], [test "$enable_man_pages" = yes])
+AS_IF([test "$enable_man_pages" = yes],
+	[AC_SUBST(GEN_MAN, YES)],
+	[AC_SUBST(GEN_MAN, NO)])
+
 AC_PROG_CC
 AM_PROG_CC_C_O
 AC_DISABLE_STATIC
@@ -36,9 +65,7 @@ AC_CONFIG_FILES([Makefile src/Makefile utils/Makefile examples/Makefile
 	doxygen/Makefile doxygen/doxygen.cfg
 	include/linux/Makefile include/linux/netfilter/Makefile])
 
-AC_ARG_WITH([doxygen], [AS_HELP_STRING([--with-doxygen],
-	    [create doxygen documentation])],
-	    [with_doxygen="$withval"], [with_doxygen=yes])
+AS_IF([test "$enable_man_pages" = no -a "$enable_html_doc" = no], [with_doxygen=no])
 
 AS_IF([test "x$with_doxygen" != xno], [
 	AC_CHECK_PROGS([DOXYGEN], [doxygen])
@@ -52,12 +79,16 @@ AM_CONDITIONAL([HAVE_DOXYGEN], [test -n "$DOXYGEN"])
 AS_IF([test "x$DOXYGEN" = x], [
 	AS_IF([test "x$with_doxygen" != xno], [
 		dnl Only run doxygen Makefile if doxygen installed
-		AC_MSG_WARN([Doxygen not found - continuing without Doxygen support])
+		AC_MSG_WARN([Doxygen not found - no documentation will be built])
 		with_doxygen=no
+		enable_html_doc=no
+		enable_man_pages=no
 	])
 ])
 AC_OUTPUT
 
 echo "
 libnetfilter_queue configuration:
-  doxygen:                      ${with_doxygen}"
+  doxygen:                      ${with_doxygen}
+man pages:                      ${enable_man_pages}
+html docs:                      ${enable_html_doc}"
diff --git a/doxygen/Makefile.am b/doxygen/Makefile.am
index bab34bf..5235f78 100644
--- a/doxygen/Makefile.am
+++ b/doxygen/Makefile.am
@@ -6,7 +6,9 @@ doxyfile.stamp: $(doc_srcs) Makefile.am
 	rm -rf html man
 	doxygen doxygen.cfg >/dev/null
 
+if BUILD_MAN
 	$(abs_top_srcdir)/doxygen/build_man.sh
+endif
 
 	touch doxyfile.stamp
 
@@ -16,13 +18,20 @@ all-local: doxyfile.stamp
 clean-local:
 	rm -rf man html
 install-data-local:
+if BUILD_MAN
 	mkdir -p $(DESTDIR)$(mandir)/man3
 	cp --no-dereference --preserve=links,mode,timestamps man/man3/*.3\
 	  $(DESTDIR)$(mandir)/man3/
+endif
+if BUILD_HTML
+	mkdir  -p $(DESTDIR)$(htmldir)
+	cp  --no-dereference --preserve=links,mode,timestamps html/*\
+		$(DESTDIR)$(htmldir)
+endif
 
 # make distcheck needs uninstall-local
 uninstall-local:
-	rm -r $(DESTDIR)$(mandir) man html doxyfile.stamp
+	rm -rf $(DESTDIR)$(mandir) man html doxyfile.stamp $(DESTDIR)$(htmldir)
 endif
 
 EXTRA_DIST = build_man.sh
diff --git a/doxygen/doxygen.cfg.in b/doxygen/doxygen.cfg.in
index 99b5c90..14bd0cf 100644
--- a/doxygen/doxygen.cfg.in
+++ b/doxygen/doxygen.cfg.in
@@ -21,7 +21,8 @@ ALPHABETICAL_INDEX     = NO
 SEARCHENGINE           = NO
 GENERATE_LATEX         = NO
 LATEX_CMD_NAME         = latex
-GENERATE_MAN           = YES
+GENERATE_MAN           = @GEN_MAN@
+GENERATE_HTML          = @GEN_HTML@
 MAN_LINKS              = YES
 HAVE_DOT               = @HAVE_DOT@
 DOT_TRANSPARENT        = YES
-- 
2.17.5




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