build: Make doc build handle O=/path/to/output/dir

Update the Documentation Makefile to handle building outside the source tree.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2 files changed, 15 insertions, 10 deletions

diff --git a/Documentation/Makefile b/Documentation/Makefile
index 87c38ae..758897c 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -1,19 +1,23 @@
 
+obj := $(obj)/Documentation
+src := $(src)/Documentation
+
 #
 # Most likely a docbook.xsl is already installed on the users system
 # instead of creating a new wheel, lets reuse what's already there.
 #
 MANPAGE_DOCBOOK_XSL =  $(shell locate manpages/docbook.xsl | head -1)
 
-%.xml: %.txt
-        asciidoc -d manpage -b docbook $<
+$(obj)/%.xml: $(src)/%.txt
+        mkdir -p $(obj)
+        asciidoc -d manpage -b docbook -o $@ $<
 
-%.1: %.xml manpage.xsl
-        xsltproc --nonet ${MANPAGE_DOCBOOK_XSL} $< > $@
+$(obj)/%.1: $(obj)/%.xml manpage.xsl
+        xsltproc --nonet -o $@ ${MANPAGE_DOCBOOK_XSL} $<
 
 TEXT = $(wildcard *.txt)
-XML = $(patsubst %.txt,%.xsl, ${TEXT})
-MAN = $(patsubst %.txt,%.1, ${TEXT})
+XML = $(patsubst %.txt,$(obj)/%.xsl, ${TEXT})
+MAN = $(patsubst %.txt,$(obj)/%.1, ${TEXT})
 
 all: ${MAN}
 
@@ -26,4 +30,5 @@ manpage.xsl:
         fi
 
 clean:
-        $(RM) *.xml *.1
+        (cd $(obj); \
+         $(RM) *.xml *.1)
diff --git a/Makefile b/Makefile
index 25d3e53..dc5241e 100644
--- a/Makefile
+++ b/Makefile
@@ -82,7 +82,7 @@ objtree		:= $(CURDIR)
 src             := $(srctree)
 obj             := $(objtree)
 
-export prefix bindir
+export prefix bindir src obj
 
 # Shell quotes
 bindir_SQ = $(subst ','\'',$(bindir))
@@ -419,10 +419,10 @@ install_gui: install_cmd gui
         $(Q)$(call do_install, kernelshark, '$(bindir_SQ)')
 
 doc:
-        $(MAKE) -C Documentation all
+        $(MAKE) -C $(src)/Documentation all
 
 doc_clean:
-        $(MAKE) -C Documentation clean
+        $(MAKE) -C $(src)/Documentation clean
 
 clean:
         $(RM) *.o *~ $(TARGETS) *.a *.so ctracecmd_wrap.c .*.d