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SIGSTKSZ is now a run-time variable

From: Carol Bouchard
Subject: SIGSTKSZ is now a run-time variable
Date: Thu, 4 Mar 2021 09:34:35 -0500

M4 Maintainers:

I work on a test system for distro testing.  I need to build newer Fedora images
before they are released to public.  A change that was introduced is the
#define SIGSTKSZ is no longer a statically defined variable.  It's value can
only be determined at run time.

# define SIGSTKSZ sysconf (_SC_SIGSTKSZ)

This affects m4 code since the code assumes a statically defined variable which
can be determined at preprocessor time.  As a result, the m4 code no longer compiles. 

                 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
      |                          ^~~~~~~~
I am using m4-1.4.18 with compiler gcc (GCC) 10.2.1 20201125 (Red Hat 10.2.1-9).
Please advise how I can get past this.  It doesn't look like a simple change.  Do you
already have a patch available for this?


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