cpupower: Disable direct build of the 'bench' subproject

Execution of the 'make' command in the 'bench' subfolder causes the
following error:

$ make O=cpupower/build/ DESTDIR=cpupower/install/ -j8
"  CC      " cpupower/build//main.o
"  CC      " cpupower/build//parse.o
/bin/sh: 1: "  CC      "cpupower/build//system.o
  CC      : not found
  make: *** [Makefile:21: cpupower/build//main.o] Error 127
  make: *** Waiting for unfinished jobs....
  /bin/sh: 1:   CC      : not found
  /bin/sh: 1:   CC      : not found
  make: *** [Makefile:21: cpupower/build//parse.o] Error 127
  make: *** [Makefile:21: cpupower/build//system.o] Error 127

The makefile uses variables defined in the main project makefile and it
is not intended to run standalone. The reason is that 'bench' subproject
depends on the 'libcpupower' library, see the 'compile-bench' target in
the main makefile.
Add a check that prevents standalone execution of the 'bench' makefile.

Signed-off-by: Roman Storozhenko <romeusmeister@gmail.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

diff --git a/tools/power/cpupower/bench/Makefile b/tools/power/cpupower/bench/Makefile
index a4b902f9e1c486801a7c14072e796a1b1f8e92ad..34e5894476ebabc1a34988da4fbe9a85b93b17fd 100644 (file)
--- a/tools/power/cpupower/bench/Makefile
+++ b/tools/power/cpupower/bench/Makefile
@@ -1,4 +1,9 @@
 # SPDX-License-Identifier: GPL-2.0
+ifeq ($(MAKELEVEL),0)
+$(error This Makefile is not intended to be run standalone, but only as a part \
+of the  main one in the parent dir)
+endif
+
 OUTPUT := ./
 ifeq ("$(origin O)", "command line")
 ifneq ($(O),)