error: call to non-‘constexpr’ function ‘long int sysconf(int)’FTBFS:

[Steve Langasek]

This code tries to use MINSIGSTKSZ as part of a constant expression, but in glibc 2.34
this now expands to a call to sysconf(), causing a build failure:

In file included from /usr/include/signal.h:328,
                 from /<<PKGBUILDDIR>>/external/catch2/catch/catch.hpp:4855,
                 from /<<PKGBUILDDIR>>/lib/test/testsuite.cpp:2:
/<<PKGBUILDDIR>>/external/catch2/catch/catch.hpp:7431:58: error: call to non-‘constexpr’ function ‘long int sysconf(int)’
 7431 | constexpr static std::size_t sigStackSize = 32768 >= MINSIGSTKSZ ? 32768 : MINSIGSTKSZ;
      | ^~~~~~~~~~~
In file included from /usr/include/x86_64-linux-gnu/bits/sigstksz.h:24,
                 from /usr/include/signal.h:328,
                 from /<<PKGBUILDDIR>>/external/catch2/catch/catch.hpp:4855,
                 from /<<PKGBUILDDIR>>/lib/test/testsuite.cpp:2:
/usr/include/unistd.h:640:17: note: ‘long int sysconf(int)’ declared here
  640 | extern long int sysconf (int __name) __THROW;
      | ^~~~~~~
In file included from /<<PKGBUILDDIR>>/lib/test/testsuite.cpp:2:
/<<PKGBUILDDIR>>/external/catch2/catch/catch.hpp:7490:45: error: size of array ‘altStackMem’ is not an integral constant-expression
 7490 | char FatalConditionHandler::altStackMem[sigStackSize] = {};
      | ^~~~~~~~~~~~

[...]

(https://launchpad.net/ubuntu/+source/segyio/1.8.3-1build5)

No fix for this is currently available in the upstream repository.

[Christian Ehrhardt  (paelzer)]

In Debian this also has a known python 3.10 issue filed as https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1000360

And it points out one of the root causes which is being out of date a lot.
1.9.8 version is current, but the 1.8.6 we have is ~2.5 years old.
=> https://github.com/equinor/segyio/tags

There is an NMU coming for python 3.10 as reported in Debian.
And it turns out Ginggs has a fix for the cpp issue already in https://launchpad.net/~ginggs/+archive/ubuntu/testing/+sourcepub/12858492/+listing-archive-extra

Next steps:
1. waiting for the NMU to sync
2. Ginggs to upload his fix
Future: waiting for 1.9.x

[Christian Ehrhardt  (paelzer)]

This build issue with glibc 2.34 was reported upstream so that we can one day drop the Delta
=> https://github.com/equinor/segyio/issues/520

[Christian Ehrhardt  (paelzer)]

But to be clear, this is an embedded source and the packaged catch2
already has a fix for
=> https://github.com/catchorg/Catch2/issues/2178
Which is the upstream issue for the "real upstream" of this code.

[Launchpad Janitor (janitor)]

This bug was fixed in the package segyio - 1.8.3-1.1ubuntu1

---------------
segyio (1.8.3-1.1ubuntu1) jammy; urgency=medium

  * Hardcode sigStackSize to 32768 to avoid test failure with glibc 2.34
    (LP: #1951658)

 -- Graham Inggs <email address hidden> Mon, 29 Nov 2021 06:43:10 +0000