From: Richard Purdie <richard.purdie@linuxfoundation.org>
To: Douglas Royds <douglas.royds@taitradio.com>,
OE Core mailing list <openembedded-core@lists.openembedded.org>
Subject: Re: glibc binary reproducibility
Date: Thu, 27 Sep 2018 09:37:12 +0100 [thread overview]
Message-ID: <faadf31ff400b7828fe69ac85138a3401a42488f.camel@linuxfoundation.org> (raw)
In-Reply-To: <2f47bda4-deb2-9603-a151-8330f0d52e08@taitradio.com>
On Thu, 2018-09-27 at 12:18 +1200, Douglas Royds wrote:
> > $ arm-tait-linux-gnueabi-gcc -march=armv5te -marm -mcpu=arm926ej-s
> > --sysroot=/home/douglas/workspace/upstream1/build/tmp/work/armv5e-
> > tait-linux-gnueabi/glibc/2.28-r0/recipe-sysroot -nostdlib
> > -nostartfiles -r -o
> > /home/douglas/workspace/upstream1/build/tmp/work/armv5e-tait-linux-
> > gnueabi/glibc/2.28-r0/build-arm-tait-linux-gnueabi/csu/crt1.o
> > /home/douglas/workspace/upstream1/build/tmp/work/armv5e-tait-linux-
> > gnueabi/glibc/2.28-r0/build-arm-tait-linux-gnueabi/csu/start.o
> > /home/douglas/workspace/upstream1/build/tmp/work/armv5e-tait-linux-
> > gnueabi/glibc/2.28-r0/build-arm-tait-linux-gnueabi/csu/abi-note.o
> > /home/douglas/workspace/upstream1/build/tmp/work/armv5e-tait-linux-
> > gnueabi/glibc/2.28-r0/build-arm-tait-linux-gnueabi/csu/init.o
> > /home/douglas/workspace/upstream1/build/tmp/work/armv5e-tait-linux-
> > gnueabi/glibc/2.28-r0/build-arm-tait-linux-gnueabi/csu/static-
> > reloc.o
>
> Note the -r = --relocatable, an ld option, which, "Generate[s]
> relocatable output---i.e., generate[s] an output file that can in
> turn serve as input to ld. This is often called partial linking",
> ie. the glibc build is just putting these .o files together for later
> convenience.
> Regrettably, this command both ignores -fdebug-prefix-map (which ld
> doesn't accept) and puts the fully-qualified path to some of the
> input .o files in the resulting crt1.o. At package splitdebuginfo()
> time, although the fully-qualified path info is split off into the
> .debug files, a (relative) path to the .debug files plus a checksum
> is tacked onto libc.so by objcopy --add-gnu-debuglink ... and the
> checksum depends on the path to the build.
> There is a work-around: turn off the debug packaging:
> > INHIBIT_PACKAGE_DEBUG_SPLIT_pn-glibc = "1"
>
> I don't have a solution for this. Suggestions?
Good work in tracking it down so far.
Going off a bit of a random memory fragment, would it help to use
relative paths in the compile/link command?
Cheers,
Richard
next prev parent reply other threads:[~2018-09-27 8:37 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-27 0:18 glibc binary reproducibility Douglas Royds
2018-09-27 0:54 ` Douglas Royds
2018-09-27 8:37 ` Richard Purdie [this message]
2018-10-02 16:58 ` Richard Purdie
2018-10-03 2:37 ` Douglas Royds
2018-10-03 2:43 ` Douglas Royds
2018-10-03 11:25 ` Richard Purdie
2018-10-03 13:31 ` Khem Raj
2018-10-03 20:55 ` Douglas Royds
2018-10-03 4:26 ` [PATCH] glibc: Fix non-IA reproducibility for shared libraries Douglas Royds
2018-10-03 4:34 ` ✗ patchtest: failure for " Patchwork
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