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Date: Tue, 26 Oct 2021 22:03:27 +0200
To: Claudius =?utf-8?Q?Schn=C3=B6rr?= <schnoerr AT mailzone DOT com>
Subject: Re: Problem/Bug with binutils-gdb and strsignal ?
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From: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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Cc: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>, cygwin AT cygwin DOT com
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On Oct 24 08:26, Claudius Schnörr via Cygwin wrote:
>      o suggestion: undefining DEFS_H might be risky -> to be added at
>        line 55:
>          + #ifndef DEFS_H
>            #    include <string.h>             /* for strsignal on
>            cygwin */
>            #else
>            char *strsignal (int __signo);      /* see
>            /usr/include/string.h on cygwin */
>            #endif
>      o then it compiles, however a library is missed now:
>          + x86_64-pc-cygwin/bin/ld:
>            event-top.o:.../insight/bundle/gdb/event-top.c:899:
>            undefined reference to `strsignal(int)'
>            collect2: error: ld returned 1 exit status

Makes sense.  The GDB build uses a c++ compiler.  If you define strsignal
as above, c++ assumes it's a C++ symbol, so its name gets mangled per
the C++ mangling rules.  Given the symbol is a plain C symbol, you'd
have to specify this explicitely, i. e. 

  extern "C" char *strsignal (int __signo);

Anyway, this needs fixing in the system header.  There's a matching
thread on the newlib mailing list addressing this problem.


Thanks,
Corinna

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