[tip:perf/core] perf tools: Allow external definition of flex and bison binary names

[tip-bot for David Carrillo-Cisneros]

Commit-ID:  39a59f1e3ea541035637432db39158a461f29146
Gitweb:     http://git.kernel.org/tip/39a59f1e3ea541035637432db39158a461f29146
Author:     David Carrillo-Cisneros <davidcc@xxxxxxxxxx>
AuthorDate: Sun, 27 Aug 2017 00:54:38 -0700
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Mon, 28 Aug 2017 16:44:45 -0300

perf tools: Allow external definition of flex and bison binary names

Allow user to define flex and bison binary names by passing FLEX and
BISON variables.

Signed-off-by: David Carrillo-Cisneros <davidcc@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Paul Turner <pjt@xxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/20170827075442.108534-3-davidcc@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/Makefile.perf | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index a700a07..58924eb 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -164,8 +164,8 @@ LN      = ln -f
 MKDIR   = mkdir
 FIND    = find
 INSTALL = install
-FLEX    = flex
-BISON   = bison
+FLEX    ?= flex
+BISON   ?= bison
 STRIP   = strip
 AWK     = awk