[PATCH] perf: fix builds with NO_LIBELF set

[David Ahern <dsahern@gmail.com>]

Build currently fails:
$ make -C tools/perf O=/tmp/pbuild NO_LIBELF=1

util/symbol.c: In function ‘dso__load’:
util/symbol.c:1128:27: error: ‘struct symsrc’ has no member named ‘dynsym’
    CC /tmp/pbuild/util/pager.o
make: *** [/tmp/pbuild/util/symbol.o] Error 1
make: *** Waiting for unfinished jobs....

Moving the dynsym reference to symbol-elf.c reveals that NO_LIBELF requires
NO_LIBUNWIND:

$ make -C tools/perf O=/tmp/pbuild NO_LIBELF=1

    LINK /tmp/pbuild/perf
/tmp/pbuild/libperf.a(unwind.o): In function `elf_section_offset':
/opt/sw/ahern/perf.git/tools/perf/util/unwind.c:176: undefined reference to `elf_begin'
/opt/sw/ahern/perf.git/tools/perf/util/unwind.c:181: undefined reference to `gelf_getehdr'
/tmp/pbuild/libperf.a(unwind.o): In function `elf_section_by_name':
/opt/sw/ahern/perf.git/tools/perf/util/unwind.c:157: undefined reference to `elf_nextscn'
/opt/sw/ahern/perf.git/tools/perf/util/unwind.c:160: undefined reference to `gelf_getshdr'
/opt/sw/ahern/perf.git/tools/perf/util/unwind.c:161: undefined reference to `elf_strptr'
/tmp/pbuild/libperf.a(unwind.o): In function `elf_section_offset':
/opt/sw/ahern/perf.git/tools/perf/util/unwind.c:190: undefined reference to `elf_end'
/tmp/pbuild/libperf.a(unwind.o): In function `read_unwind_spec':
/opt/sw/ahern/perf.git/tools/perf/util/unwind.c:190: undefined reference to `elf_end'
collect2: ld returned 1 exit status
make: *** [/tmp/pbuild/perf] Error 1
make: Leaving directory `/opt/sw/ahern/perf.git/tools/perf'

This patch fixes both.

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/Makefile          |    1 +
 tools/perf/util/symbol-elf.c |    3 +++
 tools/perf/util/symbol.c     |    2 +-
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 75af93d..1eb7f12 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -469,6 +469,7 @@ PYRF_OBJS += $(OUTPUT)util/xyarray.o
 ifdef NO_LIBELF
 	NO_DWARF := 1
 	NO_DEMANGLE := 1
+	NO_LIBUNWIND := 1
 else
 FLAGS_LIBELF=$(ALL_CFLAGS) $(ALL_LDFLAGS) $(EXTLIBS)
 ifneq ($(call try-cc,$(SOURCE_LIBELF),$(FLAGS_LIBELF)),y)
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 5b37e13..db0cc92 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -183,6 +183,9 @@ int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map *
 	Elf *elf;
 	int nr = 0, symidx, err = 0;
 
+	if (!ss->dynsym)
+		return 0;
+
 	elf = ss->elf;
 	ehdr = ss->ehdr;
 
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 2293a4a..753699a 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1125,7 +1125,7 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
 	else
 		ret = -1;
 
-	if (ret > 0 && runtime_ss->dynsym) {
+	if (ret > 0) {
 		int nr_plt;
 
 		nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
-- 
1.7.10.1