linux-kernel - Re: [PATCH] perf build: Specify libtraceevent dir to rpath for asan/msan build

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Date: Wed, 8 May 2024 16:18:51 -0700
From: Ian Rogers <irogers@...gle.com>
To: Yang Jihong <yangjihong@...edance.com>
Cc: peterz@...radead.org, mingo@...hat.com, acme@...nel.org, 
	namhyung@...nel.org, mark.rutland@....com, alexander.shishkin@...ux.intel.com, 
	jolsa@...nel.org, adrian.hunter@...el.com, kan.liang@...ux.intel.com, 
	james.clark@....com, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf build: Specify libtraceevent dir to rpath for
 asan/msan build

On Mon, May 6, 2024 at 1:17 AM Yang Jihong <yangjihong@...edance.com> wrote:
>
> perf built by asan/msan will not search for shared libraries in the
> -L directory. For cross-compilation, we assume that sanitizers is
> generally not enabled and add libtraceevent dir to rpath in a simple way.
>
> 1. msan build
>
> Before:
>   $ make -C tools/perf O=/tmp/perf DEBUG=1 EXTRA_CFLAGS="-O0 -g -fno-omit-frame-pointer -fsanitize=memory -fsanitize-memory-track-origins" CC=clang CXX=clang++ HOSTCC=clang NO_LIBELF=1 BUILD_BPF_SKEL=0 NO_LIBPFM=1 LIBTRACEEVENT_DIR=/opt/libtraceevent
>   ...
>   $ /tmp/perf/perf
>   /tmp/perf/perf: error while loading shared libraries: libtraceevent.so.1: cannot open shared object file: No such file or directory
>
> After:
>   $ make -C tools/perf O=/tmp/perf DEBUG=1 EXTRA_CFLAGS="-O0 -g -fno-omit-frame-pointer -fsanitize=memory -fsanitize-memory-track-origins" CC=clang CXX=clang++ HOSTCC=clang NO_LIBELF=1 BUILD_BPF_SKEL=0 NO_LIBPFM=1 LIBTRACEEVENT_DIR=/opt/libtraceevent
>   ...
>   $ /tmp/perf/perf --build-options
>   perf version 6.9.0-rc5
>   <SNIP>
>            libtraceevent: [ on  ]  # HAVE_LIBTRACEEVENT
>   <SNIP>
>
>  2. asan build
>
> Before:
>   $ make DEBUG=1 EXTRA_CFLAGS='-fno-omit-frame-pointer -fsanitize=address' LIBTRACEEVENT_DIR=/opt/libtraceevent
>   ...
>   $ ./perf
>   ./perf: error while loading shared libraries: libtraceevent.so.1: cannot open shared object file: No such file or directory
>
> After:
>    $ make DEBUG=1 EXTRA_CFLAGS='-fno-omit-frame-pointer -fsanitize=address' LIBTRACEEVENT_DIR=/opt/libtraceevent
>    ...
>    $ ./perf --build-options
>    perf version 6.9.0-rc5
>    <SNIP>
>             libtraceevent: [ on  ]  # HAVE_LIBTRACEEVENT
>    <SNIP>
>
> Signed-off-by: Yang Jihong <yangjihong@...edance.com>
> ---
>  tools/perf/Makefile.config | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index 7f1e016a9253..a9a923358604 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -188,6 +188,10 @@ TRACEEVENTLIBS := -ltraceevent
>  ifdef LIBTRACEEVENT_DIR
>    LIBTRACEEVENT_CFLAGS  := -I$(LIBTRACEEVENT_DIR)/include
>    LIBTRACEEVENT_LDFLAGS := -L$(LIBTRACEEVENT_DIR)/lib
> +  # Specify rpath for asan/msan build. Generally, cross-compilation will not enable sanitizers.
> +  ifeq ($(findstring -fsanitize=,${EXTRA_CFLAGS}),-fsanitize=)
> +    LIBTRACEEVENT_LDFLAGS += -Wl,-rpath,$(LIBTRACEEVENT_DIR)/lib
> +  endif

Thanks for this! I found I need the following to make it work:
```
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index a9a923358604..bcf4ab292462 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -190,7 +190,11 @@ ifdef LIBTRACEEVENT_DIR
  LIBTRACEEVENT_LDFLAGS := -L$(LIBTRACEEVENT_DIR)/lib
  # Specify rpath for asan/msan build. Generally, cross-compilation
will not enable sanitizers.
  ifeq ($(findstring -fsanitize=,${EXTRA_CFLAGS}),-fsanitize=)
-    LIBTRACEEVENT_LDFLAGS += -Wl,-rpath,$(LIBTRACEEVENT_DIR)/lib
+    ifeq (${IS_64_BIT}, 1)
+      LIBTRACEEVENT_LDFLAGS += -Wl,-rpath,$(LIBTRACEEVENT_DIR)/lib64
+    else
+      LIBTRACEEVENT_LDFLAGS += -Wl,-rpath,$(LIBTRACEEVENT_DIR)/lib
+    endif
  endif
endif
FEATURE_CHECK_CFLAGS-libtraceevent := $(LIBTRACEEVENT_CFLAGS)
```

My libtraceevent build command is:
$ make EXTRA_CFLAGS="-O0 -g -fsanitize=address" DESTDIR=~/libtrace install
and I build perf with:
$ make -C tools/perf O=/tmp/perf DEBUG=1 EXTRA_CFLAGS="-O0 -g
-fno-omit-frame-pointer -fsanitize=address -Wno-error=unused-function"
LIBTRACEEVENT_DIR=~/libtrace/usr/local
I'm checking which library is used with ldd.

Thanks,
Ian

>  endif
>  FEATURE_CHECK_CFLAGS-libtraceevent := $(LIBTRACEEVENT_CFLAGS)
>  FEATURE_CHECK_LDFLAGS-libtraceevent := $(LIBTRACEEVENT_LDFLAGS) $(TRACEEVENTLIBS)
> --
> 2.25.1
>