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Re: [PATCH] hurd: Add shared mig declarations
From: |
Simon Marchi |
Subject: |
Re: [PATCH] hurd: Add shared mig declarations |
Date: |
Sat, 30 May 2020 21:51:35 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.1 |
On 2020-05-30 2:23 p.m., Samuel Thibault wrote:
> Fixes
>
> exc_request_S.c:177:24: error: no previous declaration for ‘exc_server’
> [-Werror=missing-declarations]
> 177 | mig_external boolean_t exc_server
>
> gdb/ChangeLog:
>
> * config/i386/i386gnu.mn [%_S.o %_U.o] (COMPILE.post): Add
> "-include gnu-nat-mig.h".
> * gnu-nat-mig.h: New file.
> * gnu-nat.c: Include "gnu-nat-mig.h".
> (exc_server, msg_reply_server, notify_server,
> process_reply_server): Remove declarations.
It took me a while to understand the underlying problem. My understanding is
that
gnu-nat.c calls this function exc_server, that is defined in the generated
file. The
generated file does not provide a header with declarations, so gnu-nat.c had
its own
local declaration. Since we now use the -Wmissing-declarations warning flag,
and the
definition in the generated exc_request_S.c didn't see a corresponding
declaration,
it caused that build failure. Is that correct? If so, please add that
explanation
or equivalent to the commit log.
My question now is: that MIG tool appears to generate both a header (%_S.h) and
source
file (%_S.c) from defs files. What is this header file used for, if it doesn't
contain
the declaration for the functions in the source file?
Simon