perf tools: Makefile: Clean up `python/perf.so' rule

There is no need for a subshell or an explicit `export';
as per the POSIX Shell Command Language specification:

  http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_09_01
  http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_10_02

It is only necessary to include the environment variable
assignment just before the command to be run.

Also, it is better to use single-quotes, because GNU make
might expand `$(BASIC_CFLAGS)' into something that the shell
could interpret within double-quotes.

Acked-by: Raghavendra D Prabhu <rprabhu@wnohang.net>
Link: http://lkml.kernel.org/n/tip-58n38o02ocuzrm9qh096hsf5@git.kernel.org
Signed-off-by: Michael Witten <mfwitten@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 4 insertions, 6 deletions

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 207dee5c5b16..aaf4dd3fd803 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -165,12 +165,10 @@ grep-libs = $(filter -l%,$(1))
 strip-libs = $(filter-out -l%,$(1))
 
 $(OUTPUT)python/perf.so: $(PYRF_OBJS)
-        $(QUIET_GEN)( \
-                export CFLAGS="$(BASIC_CFLAGS)"; \
-                python util/setup.py --quiet  build_ext --build-lib='$(OUTPUT)python' \
-                        --build-temp='$(OUTPUT)python/temp' \
-        )
-
+        $(QUIET_GEN)CFLAGS='$(BASIC_CFLAGS)' python util/setup.py \
+          --quiet build_ext \
+          --build-lib='$(OUTPUT)python' \
+          --build-temp='$(OUTPUT)python/temp'
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