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Message-ID: <4085b352-f5e8-c0e8-42cf-7a6ecf23282f@gmx.net>
Date: Sat, 29 Jul 2023 12:59:50 +0200
From: Georg Müller <georgmueller@....net>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf probe: skip test_uprobe_from_different_cu if there
is no gcc
Am 29.07.23 um 02:38 schrieb Masami Hiramatsu (Google):
>
> Interesting, so clang will not generate DWARF or perf probe is not able to
> handle clang generated DWARF?
>
clang does not accept mixed -flto and non-lto CUs and the problem is not
reproducible by this sample code using clang if using -flto for all CUs.
There might be (bigger?) examples where the same issue is triggered by
clang and bigger examples (like systemd on fedora) where I ran into the
bug, but this small example only shows the problem when using gcc and
mixing -flto and non-lto CUs.
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