From: Namhyung Kim <[email protected]>
When perf detects no libelf during the build, it'll use internal mini
elf parser instead of libelf. But as it only supports minimal
functionalities, it also disables support to 'probe' builtin command.
Currently it didn't warned to user. Fix it.
$ sudo apt-get remove libelf-dev
$ make
CHK -fstack-protector-all
CHK -Wstack-protector
CHK -Wvolatile-register-var
CHK bionic
CHK libelf
CHK glibc
Makefile:491: No libelf found, disables 'probe' tool, please install
elfutils-libelf-devel/libelf-dev
CHK libunwind
CHK libaudit
$ make NO_LIBELF=1
CHK -fstack-protector-all
CHK -Wstack-protector
CHK -Wvolatile-register-var
CHK bionic
CHK libaudit
Reported-by: Peter Zijlstra <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
[ committer note: The package needed is elfutils-libelf-devel, not
elfutils-devel ]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
---
tools/perf/Makefile | 2 ++
1 file changed, 2 insertions(+)
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 7e25f59..b1801e0 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -490,6 +490,8 @@ ifneq ($(call
try-cc,$(SOURCE_LIBELF),$(FLAGS_LIBELF),libelf),y)
LIBC_SUPPORT := 1
endif
ifeq ($(LIBC_SUPPORT),1)
+ msg := $(warning No libelf found, disables 'probe' tool, please
install elfutils-libelf-devel/libelf-dev);
+
NO_LIBELF := 1
NO_DWARF := 1
NO_DEMANGLE := 1
--
1.7.9.2.358.g22243
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