Ubuntu 22.04: perl ExtUtils::Embed is broken for ldopts

arayq2

8/29/24, 2:40 AM

Running perl -MExtUtils::Embed -e ldopts results in unusable output:

-Wl,-E -fstack-protector-strong -L/usr/local/lib -L/usr/lib/x86_64-linux-gnu/perl/5.34/CORE -lperl -ldl -lm -lpthread -lc -lcrypt

There is, in fact no libperl.so anywhere in the system. There are, however, /usr/lib/x86_64-linux-gnu/libperl.so.5.34 and /usr/lib/x86_64-linux-gnu/libperl.so.5.34.0 in /usr/lib/x86_64-linux-gnu. Not only is this directory missing from the output above, but libperl.so as a symlink there to libperl.so.5.34 or libperl.so.5.34.0 is also missing.

Note that Makefiles usually use the output of -e ccopts and -e ldopts to set arguments correctly with respect to the environment rather than hardcoding them. Now, with the ExtUtils::Embed module broken, reliable and portable builds are impossible. (Think, e.g. dockerized apps).

How did this get so royally fubar-ed? How can this be fixed?

EDIT/UPDATE: As suggested in the comments, thelibperl-dev package is installed. (apt-get says so).

UPDATE 2: The easiest fix may be in the libperl-dev package, which can install a libperl.so symlink in the original location of the libraries (/usr/local/lib?) as well. Then Embed.pm wouldn't need to change, as its output would work, thus preserving the dynamic settings in Makefiles too.

0 + 6

perl

steeldriver

8/29/24, 3:08 AM

AFAIK the symlink should be provided by the `libperl-dev` package - have you installed it?

Steffen Ullrich

8/29/24, 4:36 AM

*"How did this get so royally fubar-ed?"* - simply by you not installing all requirements. Everything is provided by libperl-dev - see https://packages.ubuntu.com/it/jammy/amd64/libperl-dev/filelist

arayq2

8/29/24, 4:46 PM

@steeldriver, according to apt-get, yes.

steeldriver

8/29/24, 5:50 PM

if the symlink was deleted, then reinstalling the package should be sufficient to re-create it

arayq2

8/30/24, 1:36 PM

@steeldriver, I tried that after posting. Result: `libperl.a` and `libperl.so` (a symlink) were properly installed in `/usr/lib/x86_64-linux-gnu` (how?!), but `Embed -e ldopts` stayed broken. I suspect the Ubuntu builders _moved_ the libraries from their original location (probably the CORE directory) to a "standard" location. If so, they forgot to adjust `Embed.pm`.

arayq2

8/30/24, 1:52 PM

On second thought, the how is easily explained under the hypothesis that the libraries were moved. Now, the install script for the `libperl-dev` package can simply _assume_ the libraries are in the "right" place and go straight there.

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