linux-kernel - Re: [PATCH] perf test: Use -Wp,-U_FORTIFY

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Message-ID: <C00F1D39-9A12-4D1C-85BD-48A6D7C0290B@nutanix.com>
Date: Mon, 26 Aug 2024 03:04:12 +0000
From: Eiichi Tsukata <eiichi.tsukata@...anix.com>
To: "peterz@...radead.org" <peterz@...radead.org>,
        "mingo@...hat.com"
	<mingo@...hat.com>,
        "acme@...nel.org" <acme@...nel.org>,
        "namhyung@...nel.org" <namhyung@...nel.org>,
        "mark.rutland@....com"
	<mark.rutland@....com>,
        "alexander.shishkin@...ux.intel.com"
	<alexander.shishkin@...ux.intel.com>,
        "jolsa@...nel.org" <jolsa@...nel.org>,
        "irogers@...gle.com" <irogers@...gle.com>,
        "adrian.hunter@...el.com"
	<adrian.hunter@...el.com>,
        "kan.liang@...ux.intel.com"
	<kan.liang@...ux.intel.com>,
        "james.clark@...aro.org"
	<james.clark@...aro.org>,
        "linux-perf-users@...r.kernel.org"
	<linux-perf-users@...r.kernel.org>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf test: Use -Wp,-U_FORTIFY_SOURCE for tests built with
 -O0

Ping

> On Aug 6, 2024, at 15:27, Eiichi Tsukata <eiichi.tsukata@...anix.com> wrote:
> 
> Hi,
> 
> FYI: Fedora uses “RPM_OPT_FLAGS”  as “EXTRA_CFLAGS” to build perf.
> https://src.fedoraproject.org/rpms/kernel/blob/rawhide/f/kernel.spec#_2908
> 
> And on Fedora40,  it has “-Wp,-D_FORTIFY_SOURCE=3”.
> 
> [eiichi@...5 ~]$ rpm --showrc | grep RPM_OPT | head -n 1
>  RPM_OPT_FLAGS="%{optflags}"
> [eiichi@...5 ~]$ rpm --eval '%{optflags}'
> -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Wno-complain-wrong-lang -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64 -march=x86-64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mon-omit-leaf-frame-pointer
> 
> Best,
> Eiichi
> 
>> On Aug 6, 2024, at 15:17, Eiichi Tsukata <eiichi.tsukata@...anix.com> wrote:
>> 
>> If EXTRA_CFLAGS has "-Wp,-D_FORTIFY_SOURCE=2", the build fails with:
>> 
>> error: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Werror=cpp]
>> 
>> Use "-Wp,-U_FORTIFY_SOURCE" instead of "-U_FORTIFY_SOURCE" for tests
>> built with -O0.
>> 
>> Signed-off-by: Eiichi Tsukata <eiichi.tsukata@...anix.com>
>> ---
>> tools/perf/tests/workloads/Build | 8 ++++----
>> 1 file changed, 4 insertions(+), 4 deletions(-)
>> 
>> diff --git a/tools/perf/tests/workloads/Build b/tools/perf/tests/workloads/Build
>> index 48bf0d3b0f3d..ec36c21e375e 100644
>> --- a/tools/perf/tests/workloads/Build
>> +++ b/tools/perf/tests/workloads/Build
>> @@ -7,7 +7,7 @@ perf-test-y += sqrtloop.o
>> perf-test-y += brstack.o
>> perf-test-y += datasym.o
>> 
>> -CFLAGS_sqrtloop.o         = -g -O0 -fno-inline -U_FORTIFY_SOURCE
>> -CFLAGS_leafloop.o         = -g -O0 -fno-inline -fno-omit-frame-pointer -U_FORTIFY_SOURCE
>> -CFLAGS_brstack.o          = -g -O0 -fno-inline -U_FORTIFY_SOURCE
>> -CFLAGS_datasym.o          = -g -O0 -fno-inline -U_FORTIFY_SOURCE
>> +CFLAGS_sqrtloop.o         = -g -O0 -fno-inline -Wp,-U_FORTIFY_SOURCE
>> +CFLAGS_leafloop.o         = -g -O0 -fno-inline -fno-omit-frame-pointer -Wp,-U_FORTIFY_SOURCE
>> +CFLAGS_brstack.o          = -g -O0 -fno-inline -Wp,-U_FORTIFY_SOURCE
>> +CFLAGS_datasym.o          = -g -O0 -fno-inline -Wp,-U_FORTIFY_SOURCE
>> -- 
>> 2.45.2
>> 
>