dev-lang/perl: fix segfault in perl-cross #19
Conversation
In developer containers or SDK, there has been a bug in cross-compiled
perl that it crashes with segmentation fault. It has two different
reasons:
The first issue is that perl depends on perl-cross 1.1.4, which has a
bug with gcc 7.x or newer, so that the necessary CFLAGS `-fwrapv` was
not appended. This issue was fixed in perl-cross 1.1.9 or newer. So we
just need to upgrade perl-cross to 1.2.2, the newest release.
```
CROSS_VER=1.2.2
```
The other issue is that the CFLAGS `-O2` was given when building
cross-compiled perl. We should replace the optimization flag with `-O0`,
when it's built by the cross compiler. Without that, the segfault will
not be fixed at all.
```
if tc-is-cross-compiler; then
replace-flags -O? -O0
fi
```
How to test inside the Flatcar SDK environment:
```
LD_PRELOAD=/build/amd64-usr/usr/lib/libperl.so.5.24.1 /build/amd64-usr/usr/bin/perl -V
```
See also coreos/bugs#2369
coreos/bugs#2545
arsv/perl-cross#60
|
Cool debugging! Have you checked if updating to the latest upstream ebuilds and upgrading perl works? It seems perl 5.28.0 uses perl-cross 1.2.2 and that approach seems a bit cleaner to me than moving perl to coreos-overlay. I also see that the current perl ebuild doesn't have the Related: gentoo/gentoo#10976 |
|
I've already tried to upgrade perl to 5.26. |
|
Filed a PR against upstream Gentoo, to turn off On the other hand, upstream Container Linux already includes a recent version of perl 5.26.2 with keyword So it would be a better approach to simply merge upstream master into flatcar-master, without changing downstream perl. I'm not sure what that change would suddenly break other builds. Anyway the critical releases were just gone, so it might be a good moment to be in sync with upstream, right? :-) |
|
So I created 2 draft PRs that merge upstream into flatcar-master, and update perl packages. With the 2 PRs, we can build an image with perl 5.26.2. On top of that, if the upstream Gentoo PR got merged, it's possible to fix the segfault issue. Unfortunately It's not possible to avoid downstream changes completely. Some perl packages still rely on old version of perl. So I'm not sure if that's a better approach. |
|
Not needed any more. |
In developer containers or SDK, there has been a bug in cross-compiled perl that it crashes with segmentation fault. It has two different reasons:
The first issue is that perl depends on perl-cross 1.1.4, which has a bug with gcc 7.x or newer, so that the necessary CFLAGS
-fwrapvwas not appended. This issue was fixed in perl-cross 1.1.9 or newer. So we just need to upgrade perl-cross to 1.2.2, the newest release.The other issue is that the CFLAGS
-O2was given when building cross-compiled perl. We should replace the optimization flag with-O0, when it's built by the cross compiler. Without that, the segfault will not be fixed at all.How to test inside the Flatcar SDK environment:
See also coreos/bugs#2369
coreos/bugs#2545
arsv/perl-cross#60