From 84087126d50400789b44459cfc45721778e6ebb0 Mon Sep 17 00:00:00 2001 From: Marti Raudsepp Date: Sat, 24 Oct 2009 19:10:36 +0300 Subject: [PATCH] perf tools: Fix compatibility with libelf 0.8 and autodetect The Makefile now automatically defines LIBELF_NO_MMAP when libelf 0.8.x is detected. libelf 0.8 is still maintained and some distributions such as Arch Linux use it instead of elfutils. Signed-off-by: Marti Raudsepp Cc: Lucas De Marchi Cc: Peter Zijlstra Cc: Paul Mackerras Cc: Frederic Weisbecker Cc: Arnaldo Carvalho de Melo Cc: Arjan van de Ven Cc: Mike Galbraith LKML-Reference: <1256400636.3007.16.camel@newn> Signed-off-by: Ingo Molnar --- tools/perf/Makefile | 6 +++++- tools/perf/util/symbol.c | 6 +++--- tools/perf/util/symbol.h | 10 ++++++++++ 3 files changed, 18 insertions(+), 4 deletions(-) diff --git a/tools/perf/Makefile b/tools/perf/Makefile index 742a32eee8fc..46e877b42d2a 100644 --- a/tools/perf/Makefile +++ b/tools/perf/Makefile @@ -422,7 +422,11 @@ ifeq ($(uname_S),Darwin) PTHREAD_LIBS = endif -ifneq ($(shell sh -c "(echo '\#include '; echo 'int main(void) { Elf * elf = elf_begin(0, ELF_C_READ_MMAP, 0); return (long)elf; }') | $(CC) -x c - $(ALL_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -o /dev/null $(ALL_LDFLAGS) > /dev/null 2>&1 && echo y"), y) +ifeq ($(shell sh -c "(echo '\#include '; echo 'int main(void) { Elf * elf = elf_begin(0, ELF_C_READ, 0); return (long)elf; }') | $(CC) -x c - $(ALL_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -o /dev/null $(ALL_LDFLAGS) > /dev/null 2>&1 && echo y"), y) + ifneq ($(shell sh -c "(echo '\#include '; echo 'int main(void) { Elf * elf = elf_begin(0, ELF_C_READ_MMAP, 0); return (long)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) + BASIC_CFLAGS += -DLIBELF_NO_MMAP + endif +else msg := $(error No libelf.h/libelf found, please install libelf-dev/elfutils-libelf-devel and glibc-dev[el]); endif diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 47ea0609a760..226f44a2357d 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -413,7 +413,7 @@ static int dso__synthesize_plt_symbols(struct dso *self, int v) if (fd < 0) goto out; - elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); + elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); if (elf == NULL) goto out_close; @@ -533,7 +533,7 @@ static int dso__load_sym(struct dso *self, int fd, const char *name, Elf *elf; int nr = 0, kernel = !strcmp("[kernel]", self->name); - elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); + elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); if (elf == NULL) { if (v) fprintf(stderr, "%s: cannot read %s ELF file.\n", @@ -675,7 +675,7 @@ static char *dso__read_build_id(struct dso *self, int v) if (fd < 0) goto out; - elf = elf_begin(fd, ELF_C_READ_MMAP, NULL); + elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); if (elf == NULL) { if (v) fprintf(stderr, "%s: cannot read %s ELF file.\n", diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h index 6e8490716408..829da9edba64 100644 --- a/tools/perf/util/symbol.h +++ b/tools/perf/util/symbol.h @@ -27,6 +27,16 @@ static inline char *bfd_demangle(void __used *v, const char __used *c, #endif #endif +/* + * libelf 0.8.x and earlier do not support ELF_C_READ_MMAP; + * for newer versions we can use mmap to reduce memory usage: + */ +#ifdef LIBELF_NO_MMAP +# define PERF_ELF_C_READ_MMAP ELF_C_READ +#else +# define PERF_ELF_C_READ_MMAP ELF_C_READ_MMAP +#endif + #ifndef DMGL_PARAMS #define DMGL_PARAMS (1 << 0) /* Include function args */ #define DMGL_ANSI (1 << 1) /* Include const, volatile, etc */