lkml.org 
[lkml]   [2009]   [Aug]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:perfcounters/urgent] perf: Auto-detect libbfd
Commit-ID:  2cdbc46d7b2cb0acb68c3ecad93b000552121fa6
Gitweb: http://git.kernel.org/tip/2cdbc46d7b2cb0acb68c3ecad93b000552121fa6
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
AuthorDate: Wed, 5 Aug 2009 14:05:16 +0200
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Wed, 5 Aug 2009 14:12:08 +0200

perf: Auto-detect libbfd

Since the C++ demangling isn't needed for everybody and
bfd/iberty aren't widely/easily available on all machines, make
it optional.

It also allows you to forcefully disable demangling by using
NO_DEMANGLE=1 and otherwise tries to detect libbfd/libiberty
combinations that result in a compiling demangler.

Reported-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
LKML-Reference: <20090801082048.GX12579@kernel.dk>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
tools/perf/Makefile | 18 +++++++++++++++++-
tools/perf/util/symbol.c | 9 +++++++++
2 files changed, 26 insertions(+), 1 deletions(-)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 4b20fa4..ff905ac 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -345,7 +345,6 @@ BUILTIN_OBJS += builtin-stat.o
BUILTIN_OBJS += builtin-top.o

PERFLIBS = $(LIB_FILE)
-EXTLIBS = -lbfd -liberty

#
# Platform specific tweaks
@@ -374,6 +373,23 @@ ifeq ($(uname_S),Darwin)
PTHREAD_LIBS =
endif

+ifdef NO_DEMANGLE
+ BASIC_CFLAGS += -DNO_DEMANGLE
+else
+
+ has_bfd := $(shell sh -c "(echo '\#include <stdio.h>'; echo '\#include <bfd.h>'; echo '\#ifndef DMGL_PARAMS'; echo '\#define DMGL_PARAMS (1 << 0)'; echo '\#define DMGL_ANSI (1 << 1)'; echo '\#endif'; echo 'int main(int argc, char **argv) { bfd_demangle(NULL, argv[0], DMGL_PARAMS | DMGL_ANSI); return 0; }') | gcc -x c - -lbfd > /dev/null 2>&1 && echo y")
+
+ has_bfd_iberty := $(shell sh -c "(echo '\#include <stdio.h>'; echo '\#include <bfd.h>'; echo '\#ifndef DMGL_PARAMS'; echo '\#define DMGL_PARAMS (1 << 0)'; echo '\#define DMGL_ANSI (1 << 1)'; echo '\#endif'; echo 'int main(int argc, char **argv) { bfd_demangle(NULL, argv[0], DMGL_PARAMS | DMGL_ANSI); return 0; }') | gcc -x c - -lbfd -liberty > /dev/null 2>&1 && echo y")
+
+ ifeq ($(has_bfd),y)
+ EXTLIBS += -lbfd
+ else ifeq ($(has_bfd_iberty),y)
+ EXTLIBS += -lbfd -liberty
+ else
+ BASIC_CFLAGS += -DNO_DEMANGLE
+ endif
+endif
+
ifndef CC_LD_DYNPATH
ifdef NO_R_TO_GCC_LINKER
# Some gcc does not accept and pass -R to the linker to specify
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index b4fe057..0580b94 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -6,7 +6,16 @@
#include <libelf.h>
#include <gelf.h>
#include <elf.h>
+
+#ifndef NO_DEMANGLE
#include <bfd.h>
+#else
+static inline
+char *bfd_demangle(void __used *v, const char __used *c, int __used i)
+{
+ return NULL;
+}
+#endif

const char *sym_hist_filter;


\
 
 \ /
  Last update: 2009-08-05 14:19    [W:0.081 / U:7.732 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site