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From: Masami Hiramatsu on 10 May 2010 13:10
Check elfutils version, and if it is old don't compile
CFI analysis code. This allows to compile perf with
old elfutils.

Signed-off-by: Masami Hiramatsu <mhiramat(a)redhat.com>
Reported-by: Robert Richter <robert.richter(a)amd.com>
Cc: Arnaldo Carvalho de Melo <acme(a)redhat.com>
Cc: Ingo Molnar <mingo(a)elte.hu>
---

tools/perf/util/probe-finder.c | 4 ++++
tools/perf/util/probe-finder.h | 3 +++
2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 562b144..93583eb 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -668,6 +668,7 @@ static int convert_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1);
if (ret <= 0 || nops == 0) {
pf->fb_ops = NULL;
+#if _ELFUTILS_PREREQ(0, 142)
} else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa &&
pf->cfi != NULL) {
Dwarf_Frame *frame;
@@ -677,6 +678,7 @@ static int convert_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
(uintmax_t)pf->addr);
return -ENOENT;
}
+#endif
}

/* Find each argument */
@@ -956,8 +958,10 @@ int find_kprobe_trace_events(int fd, struct perf_probe_event *pev,
return -EBADF;
}

+#if _ELFUTILS_PREREQ(0, 142)
/* Get the call frame information from this dwarf */
pf.cfi = dwarf_getcfi(dbg);
+#endif

off = 0;
line_list__init(&pf.lcache);
diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
index 66f1980..e1f61dc 100644
--- a/tools/perf/util/probe-finder.h
+++ b/tools/perf/util/probe-finder.h
@@ -29,6 +29,7 @@ extern int find_line_range(int fd, struct line_range *lr);

#include <dwarf.h>
#include <libdw.h>
+#include <version.h>

struct probe_finder {
struct perf_probe_event *pev; /* Target probe event */
@@ -44,7 +45,9 @@ struct probe_finder {
struct list_head lcache; /* Line cache for lazy match */

/* For variable searching */
+#if _ELFUTILS_PREREQ(0, 142)
Dwarf_CFI *cfi; /* Call Frame Information */
+#endif
Dwarf_Op *fb_ops; /* Frame base attribute */
struct perf_probe_arg *pvar; /* Current target variable */
struct kprobe_trace_arg *tvar; /* Current result variable */


--
Masami Hiramatsu
e-mail: mhiramat(a)redhat.com
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