Bug#989399: nauty FTCBFS -- multiple reasons

[Nilesh Patra]

Package: nauty
Version: 2.7r1+ds-2
Severity: normal
Tags: patch
User: debian-cross at lists.debian.org
Usertags: ftcbfs
X-Debbugs-Cc: nilesh at debian.org, debian-cross at lists.debian.org

Dear Maintainer,

Nauty fails to cross build due to two reasons:

1. It uses AC_RUN_IFELSE testing which cannot heppen during cross build
   Simply replacing it by AC_LINK_IFELSE does the trick. Please find the
   patch for this below, and consider applying

2. It uses help2man during build, and the same has also been
   autotoolised - this isn't allowed during build. It looks like there's particularly
   no good way to fix it, and probably compiling twice once for build
   arch, and once for host is un-needed extra work.
   I'd suggest removing the help2man invocations from autotools, not
   generate this during build, but simply maintain maintainer manpage,
   using for example createmanpages script[1]
   Talking to upstream and asking them to vendor their own manpages from
   next release can also be a nice option.

   If it is too much hassle for you, I'm willing to do so myself and
   even maintain the package

[1]: https://salsa.debian.org/med-team/community/helper-scripts/-/blob/master/createmanpages

--- a/configure.ac
+++ b/configure.ac
@@ -295,7 +295,7 @@

 dnl --check if popcnt instruction is available and desired
 AC_MSG_CHECKING(if popcnt instruction is available and requested)
-AC_RUN_IFELSE([AC_LANG_PROGRAM([],[[if (__builtin_cpu_supports("popcnt")) return 0; else return 1;]])],
+AC_LINK_IFELSE([AC_LANG_PROGRAM([],[[if (__builtin_cpu_supports("popcnt")) return 0; else return 1;]])],
   popsup=1,popsup=0)

 AS_IF([test "$allow_popcnt" -eq 1],


-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 5.7.0-2-amd64 (SMP w/8 CPU threads)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages nauty depends on:
ii  libc6      2.31-3
ii  libgmp10   2:6.2.0+dfsg-6
pn  libnauty2  <none>
ii  zlib1g     1:1.2.11.dfsg-2

nauty recommends no packages.

Versions of packages nauty suggests:
ii  graphviz   2.42.2-4
pn  nauty-doc  <none>