[Bug build/26647] New: [-Werror=array-parameter=] due to different declarations for __sigsetjmp

[vvinayag at arm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26647

            Bug ID: 26647
           Summary: [-Werror=array-parameter=] due to different
                    declarations for __sigsetjmp
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: vvinayag at arm dot com
                CC: carlos at redhat dot com
  Target Milestone: ---

After this patch [1], I am seeing this -Warray-parameter error when building
gcc:

In file included from ../include/pthread.h:1,
                 from ../sysdeps/nptl/thread_db.h:25,
                 from ../nptl/descr.h:32,
                 from ../sysdeps/aarch64/nptl/tls.h:44,
                 from ../include/errno.h:25,
                 from ../sysdeps/unix/sysv/linux/sysdep.h:23,
                 from ../sysdeps/unix/sysv/linux/generic/sysdep.h:22,
                 from ../sysdeps/unix/sysv/linux/aarch64/sysdep.h:24,
                 from <stdin>:1:
../sysdeps/nptl/pthread.h:734:47: error: argument 1 of type ‘struct
__jmp_buf_tag *’ declared as a pointer [-Werror=array-parameter=]
  734 | extern int __sigsetjmp (struct __jmp_buf_tag *__env, int __savemask)
__THROWNL;
      |                         ~~~~~~~~~~~~~~~~~~~~~~^~~~~
In file included from ../include/setjmp.h:2,
                 from ../nptl/descr.h:24,
                 from ../sysdeps/aarch64/nptl/tls.h:44,
                 from ../include/errno.h:25,
                 from ../sysdeps/unix/sysv/linux/sysdep.h:23,
                 from ../sysdeps/unix/sysv/linux/generic/sysdep.h:22,
                 from ../sysdeps/unix/sysv/linux/aarch64/sysdep.h:24,
                 from <stdin>:1:
../setjmp/setjmp.h:54:46: note: previously declared as an array ‘struct
__jmp_buf_tag[1]’
   54 | extern int __sigsetjmp (struct __jmp_buf_tag __env[1], int __savemask)
__THROWNL;
      |                         ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
cc1: all warnings being treated as errors


The build/host/target setup is:
Build: x86_64-linux-gnu (Ubuntu 18.04)
Host: x86_64-linux-gnu
Target: aarch64-none-linux-gnu, aarch64_be-none-linux-gnu,
arm-none-linux-gnueabi, arm-none-linux-gnueabihf


This was mentioned in
https://gcc.gnu.org/pipermail/gcc-patches/2020-September/554415.html and it
seems like the warning might need to be suppressed in glibc.

[1]
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=6450f07388f9fe575a489c9309c36012b17b88b0

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