In case the user specifies MAKEFLAGS as an environment variable,
or uses 'make -jN' explicitly, the options can conflict and result in:
BUILD: Doing 'make -j8' parallel build
make[1]: warning: -jN forced in submake: disabling jobserver mode.
GEN common-cmds.h
make[1]: *** write jobserver: Bad file descriptor. Stop.
Make sure we invoke the main makefile in a pristine state.
Users who want to do something non-standard can use the:
make -f Makefile.perf
method to invoke the makefile.
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: David Ahern <dsah...@gmail.com>
Cc: Jiri Olsa <jo...@redhat.com>
Link: http://lkml.kernel.org/n/tip-uen6hztvkqqngqwjma9yo...@git.kernel.org
Signed-off-by: Ingo Molnar <mi...@kernel.org>
---
tools/perf/Makefile | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 6f6f13a..74f52d8 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -1,3 +1,10 @@
+#
+# This is a simple wrapper Makefile that calls the main Makefile.perf
+# with a -j option to do parallel builds
+#
+# If you want to invoke the perf build in some non-standard way then
+# you can use the 'make -f Makefile.perf' method to invoke it.
+#
#
# Clear out the built-in rules GNU make defines by default (such as .o
targets),
@@ -6,6 +13,11 @@
.SUFFIXES:
#
+# We don't want to pass along options like -j:
+#
+unexport MAKEFLAGS
+
+#
# Do a parallel build with multiple jobs, based on the number of CPUs online
# in this system: 'make -j8' on a 8-CPU system, etc.
#
@@ -18,14 +30,12 @@ ifeq ($(JOBS),)
endif
endif
-export JOBS
-
define print_msg
@printf ' BUILD: Doing '\''make \033[33m-j'$(JOBS)'\033[m'\'' parallel
build\n'
endef
define make
- @$(MAKE) -f Makefile.perf --no-print-directory -j$(JOBS) $@
+ @$(MAKE) -f Makefile.perf --no-print-directory -j$(JOBS) O=$(O) $@
endef
#
--
1.8.3.1
--
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