From: Ben Hutchings <ben@decadent.org.uk>
Date: Fri, 06 Jul 2018 23:22:10 +0100
Subject: perf Documentation: Fix out-of-tree asciidoctor man page generation

The dependency for the man page rule using asciidoctor incorrectly
specifies a source file in $(OUTPUT).  When building out-of-tree, the
source file is not found, resulting in a fall-back to the following
rule which uses xmlto.

Fixes: ffef80ecf89f ("perf Documentation: Support for asciidoctor")
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
--- a/tools/perf/Documentation/Makefile
+++ b/tools/perf/Documentation/Makefile
@@ -285,7 +285,7 @@ $(MAN_HTML): $(OUTPUT)%.html : %.txt
 	mv $@+ $@
 
 ifdef USE_ASCIIDOCTOR
-$(OUTPUT)%.1 $(OUTPUT)%.5 $(OUTPUT)%.7 : $(OUTPUT)%.txt
+$(OUTPUT)%.1 $(OUTPUT)%.5 $(OUTPUT)%.7 : %.txt
 	$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \
 	$(ASCIIDOC) -b manpage -d manpage \
 		$(ASCIIDOC_EXTRA) -aperf_version=$(PERF_VERSION) -o $@+ $< && \