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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ada/99264] New: Ada doesn't build against latest glibc
Date: Thu, 25 Feb 2021 10:02:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99264

            Bug ID: 99264
           Summary: Ada doesn't build against latest glibc
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ada
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
  Target Milestone: ---

In file included from /usr/include/signal.h:315,
                 from /usr/include/sys/param.h:28,
                 from ../../gcc/system.h:305,
                 from ../../gcc/ada/init.c:71:
../../gcc/ada/init.c:584:18: error: missing binary operator before token "("
  584 | # if 16 * 1024 < MINSIGSTKSZ
      |                  ^~~~~~~~~~~

Apparently the latest glibc defines it as
sysconf (_SC_SIGSTKSZ)
and so it isn't usable in preprocessor.=