man: fix manpage build instructions

This fixes all the out-of-tree build-failures with manpages and uses a
.man_fixup file to avoid overriding man-pages on every build.

Manpages are only built if xsltproc is found and the stylesheets are
available locally. You can disable building manpages with
--disable-manpages so the quite expensive xsltproc procedure can be
skipped.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

4 files changed, 42 insertions, 15 deletions

diff --git a/.gitignore b/.gitignore
index 1de66bca..225fd801 100644
--- a/.gitignore
+++ b/.gitignore
@@ -52,6 +52,7 @@ libkms.pc
 libtool
 ltmain.sh
 mach64.kld
+man/.man_fixup
 mga.kld
 missing
 mkinstalldirs
diff --git a/Makefile.am b/Makefile.am
index 9f106d39..8ecd9d93 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -49,7 +49,7 @@ if HAVE_EXYNOS
 EXYNOS_SUBDIR = exynos
 endif
 
-SUBDIRS = . $(LIBKMS_SUBDIR) $(INTEL_SUBDIR) $(NOUVEAU_SUBDIR) $(RADEON_SUBDIR) $(OMAP_SUBDIR) $(EXYNOS_SUBDIR) tests include 
+SUBDIRS = . $(LIBKMS_SUBDIR) $(INTEL_SUBDIR) $(NOUVEAU_SUBDIR) $(RADEON_SUBDIR) $(OMAP_SUBDIR) $(EXYNOS_SUBDIR) tests include man
 
 libdrm_la_LTLIBRARIES = libdrm.la
 libdrm_ladir = $(libdir)
diff --git a/configure.ac b/configure.ac
index 10cc9a42..9ee79409 100644
--- a/configure.ac
+++ b/configure.ac
@@ -226,8 +226,26 @@ if test "x$HAVE_LIBUDEV" = xyes; then
 fi
 AM_CONDITIONAL(HAVE_LIBUDEV, [test "x$HAVE_LIBUDEV" = xyes])
 
+# xsltproc for docbook manpages
+AC_ARG_ENABLE([manpages],
+              AS_HELP_STRING([--disable-manpages], [disable manpages @<:@default=enabled@:>@]),
+              [MANS=$enableval], [MANS=auto])
 AC_PATH_PROG(XSLTPROC, xsltproc)
-AM_CONDITIONAL([HAVE_XSLTPROC], [test "x$XSLTPROC" != "x"])
+AM_CONDITIONAL([BUILD_MANPAGES], [test "x$XSLTPROC" != "x" -a "x$MANS" != "xno"])
+
+# check for offline man-pages stylesheet
+AC_MSG_CHECKING([for docbook manpages stylesheet])
+MANPAGES_STYLESHEET="http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl"
+AC_PATH_PROGS_FEATURE_CHECK([XSLTPROC_TMP], [xsltproc],
+                            AS_IF([`"$ac_path_XSLTPROC_TMP" --nonet "$MANPAGES_STYLESHEET" > /dev/null 2>&1`],
+                                  [HAVE_MANPAGES_STYLESHEET=yes]))
+if test "x$HAVE_MANPAGES_STYLESHEET" = "xyes"; then
+        AC_SUBST(MANPAGES_STYLESHEET)
+        AC_MSG_RESULT([yes])
+else
+        AC_MSG_RESULT([no])
+fi
+AM_CONDITIONAL([HAVE_MANPAGES_STYLESHEET], [test "x$HAVE_MANPAGES_STYLESHEET" = "xyes"])
 
 if test "x$INTEL" != "xno" -o "x$RADEON" != "xno" -o "x$NOUVEAU" != "xno" -o "x$OMAP" != "xno"; then
     # Check for atomic intrinsics
diff --git a/man/Makefile.am b/man/Makefile.am
index 32acd076..25202e28 100644
--- a/man/Makefile.am
+++ b/man/Makefile.am
@@ -18,37 +18,45 @@ MANPAGES_ALIASES = \
 
 XML_FILES = \
 	${patsubst %.1,%.xml,${patsubst %.3,%.xml,${patsubst %.5,%.xml,${patsubs %.7,%.xml,$(MANPAGES)}}}}
-CLEANFILES =
-EXTRA_DIST =
+EXTRA_DIST = $(XML_FILES)
+CLEANFILES = $(MANPAGES) $(MANPAGES_ALIASES) .man_fixup
 man_MANS =
 
-if HAVE_XSLTPROC
+if BUILD_MANPAGES
+if HAVE_MANPAGES_STYLESHEET
 
-CLEANFILES += $(MANPAGES) $(MANPAGES_ALIASES)
-EXTRA_DIST += $(MANPAGES) $(MANPAGES_ALIASES) $(XML_FILES)
 man_MANS += $(MANPAGES) $(MANPAGES_ALIASES)
 
 XSLTPROC_FLAGS = \
 	--stringparam man.authors.section.enabled 0 \
 	--stringparam man.copyright.section.enabled 0 \
 	--stringparam funcsynopsis.style ansi \
-	--stringparam man.output.quietly 1
+	--stringparam man.output.quietly 1 \
+	--nonet
 
 XSLTPROC_PROCESS_MAN = \
 	$(AM_V_GEN)$(MKDIR_P) $(dir $@) && \
-	$(XSLTPROC) -o $@ $(XSLTPROC_FLAGS) http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl $< && \
-	$(SED) -i -e 's/^\.so \(.*\)\.\(.\)$$/\.so man\2\/\1\.\2/' $(MANPAGES_ALIASES)
+	$(XSLTPROC) -o "$@" $(XSLTPROC_FLAGS) $(MANPAGES_STYLESHEET) "$<" && \
+	touch .man_fixup
 
-%.1: %.xml
+# Force .man_fixup if $(MANPAGES) are not built
+.man_fixup: | $(MANPAGES)
+	@touch .man_fixup
+
+$(MANPAGES_ALIASES): $(MANPAGES) .man_fixup
+	$(AM_V_GEN)if test -n "$@" ; then $(SED) -i -e 's/^\.so \([a-z_]\+\)\.\([0-9]\)$$/\.so man\2\/\1\.\2/' "$@" ; fi
+
+%.1: $(top_srcdir)/man/%.xml
 	$(XSLTPROC_PROCESS_MAN)
 
-%.3: %.xml
+%.3: $(top_srcdir)/man/%.xml
 	$(XSLTPROC_PROCESS_MAN)
 
-%.5: %.xml
+%.5: $(top_srcdir)/man/%.xml
 	$(XSLTPROC_PROCESS_MAN)
 
-%.7: %.xml
+%.7: $(top_srcdir)/man/%.xml
 	$(XSLTPROC_PROCESS_MAN)
 
-endif # HAVE_XSLTPROC
+endif # HAVE_MANPAGES_STYLESHEET
+endif # BUILD_MANPAGES