On Wed, 2009-08-05 at 12:16 +0000, tip-bot for Peter Zijlstra wrote:
> Commit-ID: 2cdbc46d7b2cb0acb68c3ecad93b000552121fa6
> Gitweb: http://git.kernel.org/tip/2cdbc46d7b2cb0acb68c3ecad93b000552121fa6
> Author: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> AuthorDate: Wed, 5 Aug 2009 14:05:16 +0200
> Committer: Ingo Molnar <mingo@xxxxxxx>
> 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.
The below simpifies the C proglet and extends it to cover auto-detection
of libelf as well, it also generates an error in case of libelf being
MIA and an warning for libbfd.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
---
tools/perf/Makefile | 15 +++++++++++----
1 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index ff905ac..e9db128 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -158,8 +158,10 @@ uname_P := $(shell sh -c 'uname -p 2>/dev/null || echo not')
uname_V := $(shell sh -c 'uname -v 2>/dev/null || echo not')
# If we're on a 64-bit kernel, use -m64
-ifneq ($(patsubst %64,%,$(uname_M)),$(uname_M))
- M64 := -m64
+ifndef NO_64BIT
+ ifneq ($(patsubst %64,%,$(uname_M)),$(uname_M))
+ M64 := -m64
+ endif
endif
# CFLAGS and LDFLAGS are for the users to override from the command line.
@@ -373,19 +375,24 @@ ifeq ($(uname_S),Darwin)
PTHREAD_LIBS =
endif
+ifneq ($(shell sh -c "(echo '\#include <libelf.h>'; echo 'int main(void) { Elf * elf = elf_begin(0, ELF_C_READ_MMAP, 0); return (int)elf; }') | $(CC) -x c - $(ALL_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -o /dev/null $(ALL_LDFLAGS) > /dev/null 2>&1 && echo y"), y)
+ msg := $(error No libelf.h/libelf found, please install libelf-dev[el]);
+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 := $(shell sh -c "(echo '\#include <bfd.h>'; echo 'int main(void) { bfd_demangle(0, 0, 0); return 0; }') | $(CC) -x c - $(ALL_CFLAGS) -o /dev/null $(ALL_LDFLAGS) -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")
+ has_bfd_iberty := $(shell sh -c "(echo '\#include <bfd.h>'; echo 'int main(void) { bfd_demangle(0, 0, 0); return 0; }') | $(CC) -x c - $(ALL_CFLAGS) -o /dev/null $(ALL_LDFLAGS) -lbfd -liberty > /dev/null 2>&1 && echo y")
ifeq ($(has_bfd),y)
EXTLIBS += -lbfd
else ifeq ($(has_bfd_iberty),y)
EXTLIBS += -lbfd -liberty
else
+ msg := $(warning No bfd.h/libbfd found, install binutils-dev[el] to gain symbol demangling)
BASIC_CFLAGS += -DNO_DEMANGLE
endif
endif
--
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