[bug#48541] [PATCH] gnu: Fix build for ldc.

[Roel Janssen <roel@gnu.org>]

On Fri, 2021-05-21 at 16:57 +0200, Ludovic Courtès wrote:
> Hi!
> 
> Roel Janssen <roel@gnu.org> writes:
> 
> > I attached the test suite's logs for the failed tests. The complete
> > log
> > can be found in 'build/Testing/Temporary/LastTest.log' of the build
> > directory of a failed build.  It is too large to attach though.
> > 
> > The log shows the following:
> > ------
> > Test runnable/b18504.d failed.  The logged output:
> > /tmp/guix-build-ldc-1.10.0.drv-0/build/bin/ldmd2 -conf= -m64 -
> > Irunnable
> > -g -g -link-defaultlib-debug  -od../../../../build/dmd-testsuite-
> > debug/runnable -of../../../../build/dmd-testsuite-
> > debug/runnable/b18504_0  runnable/b18504.d 
> > gdb ../../../../build/dmd-testsuite-debug/runnable/b18504_0 --batch
> > -x
> > ../../../../build/dmd-testsuite-debug/runnable/b18504_0.gdb
> > warning: Could not trace the inferior process.
> > warning: ptrace: Operation not permitted
> > ../../../../build/dmd-testsuite-debug/runnable/b18504_0.gdb:2:
> > Error in
> > sourced command file:
> > During startup program exited with code 127.
> > 
> > ------
> 
> Interesting.  Looking at ptrace(2), it’s not supposed to fail with
> EPERM
> in the build environment, unless again that’s because of the Yama
> thing
> I mentioned.  What’s the value of /proc/sys/kernel/yama/ptrace_scope
> on
> your build machine?
> 

Interesting indeed.  Then I don't know why it fails.
It is set to 0 on my build machine.

> So I’d say: adjust the comment with a link to
> <https://issues.guix.gnu.org/48541>, saying that ptrace(2) fails with
> EPERM, and push it.
> 
> We can always improve later if/when we find more info.
> 

I adjusted the comment in the recipe, and pushed in
082988afac8ddac7525b40fb7ef8da7ff40f8ad3.
Thanks for the quick reviewing!

> 
> Thanks,
> Ludo’.
>