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([2001:8b0:aba:5f3c:ac04:f180:6f5c:7b1d]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4831093650esm47139355e9.15.2026.02.04.01.34.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Feb 2026 01:34:37 -0800 (PST) Message-ID: Subject: Re: [PATCH] lto.inc: add DEBUG_PREFIX_MAP back to TARGET_LDFLAGS From: Richard Purdie To: changqing.li@windriver.com, openembedded-core@lists.openembedded.org Cc: rs@ti.com, ricardo.salveti@oss.qualcomm.com, raj.khem@gmail.com, antonin.godard@bootlin.com Date: Wed, 04 Feb 2026 09:34:36 +0000 In-Reply-To: <20260204052638.284617-1-changqing.li@windriver.com> References: <20260204052638.284617-1-changqing.li@windriver.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.0-1ubuntu0.1 MIME-Version: 1.0 List-Id: X-Webhook-Received: from 45-33-107-173.ip.linodeusercontent.com [45.33.107.173] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Wed, 04 Feb 2026 09:34:46 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/230504 On Wed, 2026-02-04 at 13:26 +0800, changqing.li@windriver.com wrote: > From: Changqing Li >=20 > DEBUG_PREFIX_MAP is appended to TARGET_LDFLAGS in commit [1] for fixing > reproducible issue when LTO is enabled. It is removed in comit [2] since > this commit causes cgo binary not reproducible. But actually, we still > need this DEBUG_PREFIX_MAP in LDFLAGS when LTO enabled. So, only appened > it when LTO is enabled. Refer [3] for the history, with this patch, > patch [4] is also needed for cgo + lto enabled. >=20 > [1] https://git.openembedded.org/openembedded-core/commit/?id=3Dfddaecc88= 979967d0e00e2fafdbaaabec030da9f > [2] https://git.openembedded.org/openembedded-core/commit/?id=3D1797741aa= d02b8bf429fac4b81e30cdda64b5448 > [3] https://lists.openembedded.org/g/openembedded-core/topic/patch_bitbak= e_conf_remove/117408334 > [4] https://lists.openembedded.org/g/openembedded-core/message/230059 >=20 > Signed-off-by: Changqing Li > --- > =C2=A0meta/conf/distro/include/lto.inc | 1 + > =C2=A01 file changed, 1 insertion(+) >=20 > diff --git a/meta/conf/distro/include/lto.inc b/meta/conf/distro/include/= lto.inc > index 227f0c5c2a..cef92901e3 100644 > --- a/meta/conf/distro/include/lto.inc > +++ b/meta/conf/distro/include/lto.inc > @@ -49,5 +49,6 @@ LTO:toolchain-clang =3D "${@bb.utils.contains('DISTRO_F= EATURES', 'thin-lto', '-flt > =C2=A0 > =C2=A0SELECTED_OPTIMIZATION:append =3D "${@bb.utils.contains('DISTRO_FEAT= URES', 'lto', ' ${LTO}', '', d)}" > =C2=A0TARGET_LDFLAGS:append:class-target =3D "${@bb.utils.contains('DISTR= O_FEATURES', 'lto', ' ${LTO}', '', d)}" > +TARGET_LDFLAGS:append:class-target =3D "${@bb.utils.contains('DISTRO_FEA= TURES', 'lto', ' ${DEBUG_PREFIX_MAP}', '', d)}" > =C2=A0 > =C2=A0SELECTED_OPTIMIZATION[vardeps] +=3D "LTO LTOEXTRA" We need a bit more information. Which version of gcc did you see this issue= with? gcc see this as a bug, for example they added this to fix it: https://gcc.gnu.org/cgit/gcc/commit/?id=3D7cc2df084b7977653a9b59cbc34a9ad50= 0ae619c In: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101473#c21 "I think it is a bug - -fdebug-prefix-map should be fully reflected in the LTO IL and thus we should not end up creating un-remapped references to files (we should not create many references to files late anyway)." i.e. it is a bug if we have to set this in LDFLAGS if I understand correctly. So we should file a bug with gcc about this, assuming you were using gcc 12 or later. Cheers, Richard