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Re: GNUstep + libobjc2 and powerpc ( was "libobjc2 on powerpc")

From: Bertrand Dekoninck
Subject: Re: GNUstep + libobjc2 and powerpc ( was "libobjc2 on powerpc")
Date: Thu, 22 Mar 2018 21:53:27 +0100
User-agent: Mozilla/5.0 (X11; Linux ppc64; rv:31.0) Gecko/20100101 Icedove/31.5.0

5. For gnustep-make build, is this line still mandatory ?
"git checkout `git rev-list -1 --first-parent --before=2017-04-06
master` # fixes segfault, should probably be looked at."

Has this bug in gnustep-make been fixed since 2017-04-06

I can’t speak for Ubuntu, but that definitely isn’t needed on FreeBSD.

    That line was added as a workaround for an issue that caused all
apps (on Debian/Ubuntu) to segfault. The issue turned out to be
incorrect instance-variable offsets when using libobjc2's nonfragile-abi.

    The reason the script's git-checkout command fixes the crashes is
that until 2017-04-06, gnustep-make's build flag for setting the
nonfragile-abi was in the wrong place, so gnustep-make builds ended up
using the fragile-abi (incorrect abi, but no crashes); When a
gnustep-make fix for the nonfragile-abi flag was checked in on
2017-04-07, builds started using the correct abi, and the crashes
appeared. (The libobjc2 ivar-offset bug was already present before then,
but it was hidden due to using the fragile-abi).

    I posted a libobjc2 patch awhile back with a workaround, and an
updated Ubuntu script that installs the patch & can then use the current
gnustep-make from the trunk (rolling it back to 2017-04-06 no longer
needed). As far as I know, that patch & script are currently the only
way to install GNUstep on Debian/Ubuntu so that it uses the
nonfragile-ABI (until a fix is checked into clang). This bug report has
some more info:



Hi, I don't think the issue I encounter now on ppc is related, but I may be hit by the same problem after this one is solved.

Where did you post your patch and script ? I didn't find it for now. Was it on the wiki ? on the list ?


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