[GIT PULL] tools/perf/build: Speed up the perf build system

[Jiri Olsa <jolsa@redhat.com>]

Arnaldo, David,
wrt to our IRC discussion..

attached patch fixies the static build David is using:
make O=/tmp/perf LDFLAGS=-static DEBUG=1 -j 4

I still got some warning though:
  LINK     /tmp/perf/perf
/tmp/perf/libperf.a(target.o): In function `perf_target__parse_uid':
/home/jolsa/kernel.org/linux-perf/tools/perf/util/target.c:72: warning: Using 'getpwnam_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/home/jolsa/kernel.org/linux-perf/tools/perf/util/target.c:84: warning: Using 'getpwuid_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/../../../../lib64/libpthread.a(libpthread.o): In function `sem_open':
(.text+0x67f8): warning: the use of `mktemp' is dangerous, better use `mkstemp'

but I guess it's ok ;-) feel free to melt the
change into the original patch

This change is on top of the NO_DEMANGLE fix in:
  git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
  acme_test

jirka

diff --git a/tools/perf/config/Makefile b/tools/perf/config/Makefile
index 233dd36..9680424 100644
--- a/tools/perf/config/Makefile
+++ b/tools/perf/config/Makefile
@@ -504,7 +504,7 @@ else
   endif
 endif
 
-ifndef ($(filter -lbfd,$(EXTLIBS)),)
+ifneq ($(filter -lbfd,$(EXTLIBS)),)
   CFLAGS += -DHAVE_LIBBFD_SUPPORT
 endif