OpenWrt/LEDE Project

  • Status Unconfirmed
  • Percent Complete
    0%
  • Task Type Build Failure
  • Category Toolchain
  • Assigned To No-one
  • Operating System All
  • Severity Medium
  • Priority Very Low
  • Reported Version openwrt-21.02
  • Due in Version Undecided
  • Due Date Undecided
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by Boris Gjenero - 09.10.2021

FS#4073 - make kernel_menuconfig fails at m4 1.4.18 in Ubuntu 21.10 because of SIGSTKSZ

I’m attempting to build openwrt 21.02 from git for a Buffalo WZR-600DHP on x86_64 Ubuntu 21.10. make kernel_menuconfig failed, and after running it with increased verbosity I see:

  gcc  -I.   -I/home/bgjenero/gitapps/openwrt/staging_dir/host/include   -O2 -I/home/bgjenero/gitapps/openwrt/staging_dir/host/include  -MT c-stack.o -MD -MP -MF $depbase.Tpo -c -o c-stack.o c-stack.c &&\
  mv -f $depbase.Tpo $depbase.Po
  In file included from /usr/include/signal.h:328,
                   from ./signal.h:52,
                   from c-stack.c:49:
  c-stack.c:55:26: error: missing binary operator before token "("
     55 | #elif HAVE_LIBSIGSEGV && SIGSTKSZ < 16384
        |                          ^~~~~~~~

That’s a failure building m4 1.4.18. It is discussed at https://lists.gnu.org/archive/html/bug-m4/2021-03/msg00000.html

The problem is that m4 is expecting SIGSTKSZ to be a compile time constant, but instead in
/usr/include/x86_64-linux-gnu/bits/sigstksz.h it is: # define SIGSTKSZ sysconf (_SC_SIGSTKSZ)

The m4 package in Ubuntu 21.10 is actually the same version, and the source package has a patch for this in https://launchpad.net/ubuntu/+archive/primary/+sourcefiles/m4/1.4.18-5ubuntu1/m4_1.4.18-5ubuntu1.debian.tar.xz at /debian/patches/04-fix-sigstksz.patch. I am attaching that patch here.

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