perf trace/scripting: Silence PERL_EMBED_* backtick errors

The backtick shell substitutions for PERL_EMBED_LDOPT/CCOPT make
a lot of noise on stderr if Embed.pm isn't installed - this
silences them.

Signed-off-by: Tom Zanussi <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
LKML-Reference: <1259565529[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 8ad57b51d648b363b5cef7a570660a616ee9e965..d62a2d7ff4e9b2fe08ec2f36dc5b9d78ecdf17aa 100644 (file)
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -490,8 +490,8 @@ else
        LIB_OBJS += util/probe-finder.o
 endif
 
-PERL_EMBED_LDOPTS = `perl -MExtUtils::Embed -e ldopts`
-PERL_EMBED_CCOPTS = `perl -MExtUtils::Embed -e ccopts`
+PERL_EMBED_LDOPTS = `perl -MExtUtils::Embed -e ldopts 2>/dev/null`
+PERL_EMBED_CCOPTS = `perl -MExtUtils::Embed -e ccopts 2>/dev/null`
 
 ifneq ($(shell sh -c "(echo '\#include <EXTERN.h>'; echo '\#include <perl.h>'; echo 'int main(void) { perl_alloc(); return 0; }') | $(CC) -x c - $(PERL_EMBED_CCOPTS) -o /dev/null $(PERL_EMBED_LDOPTS) > /dev/null 2>&1 && echo y"), y)
        BASIC_CFLAGS += -DNO_LIBPERL