linux-kernel - Re: [PATCH] basic perf support for sparc

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Date:	Wed, 05 Aug 2009 14:10:56 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Kyle McMartin <kyle@...artin.ca>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Anton Blanchard <anton@...ba.org>, davem@...emloft.net,
	linux-kernel@...r.kernel.org, fweisbec@...il.com,
	benh@...nel.crashing.org, penberg@...helsinki.fi,
	vegard.nossum@...il.com, paulus@...ba.org, williams@...hat.com
Subject: Re: [PATCH] basic perf support for sparc

On Sun, 2009-08-02 at 15:44 -0400, Kyle McMartin wrote:

> Why not abuse the perf Makefile, which already has this kind of
> portability gunk in it?

Does this work for people?

---
Subject: perf: autodetect libbfd
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Date: Wed Aug 05 14:05:16 CEST 2009

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

It 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.

Cc: Jens Axboe <jens.axboe@...cle.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 tools/perf/Makefile      |   17 ++++++++++++++++-
 tools/perf/util/symbol.c |    9 +++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)

Index: linux-2.6/tools/perf/Makefile
===================================================================
--- linux-2.6.orig/tools/perf/Makefile
+++ linux-2.6/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 +373,22 @@ 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
Index: linux-2.6/tools/perf/util/symbol.c
===================================================================
--- linux-2.6.orig/tools/perf/util/symbol.c
+++ linux-2.6/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;
 


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