[Bug gdb/27750] local variables have wrong address and values on sparc64

["dclarke at blastwave dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27750

--- Comment #2 from Dennis Clarke <dclarke at blastwave dot org> ---

Seems like a good observation and I sort of wondered about the compiler
here. So then with gcc 9.3.0 from the Debian folks : 

mimas$ /usr/bin/sparc64-linux-gnu-gcc-9 --version 
sparc64-linux-gnu-gcc-9 (Debian 9.3.0-21) 9.3.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

mimas$ cat -n foo.c 
     1
     2  #include <stdio.h>
     3  #include <stdlib.h>
     4
     5  int main(int argc, char **argv)
     6  {
     7      int a = 1;
     8
     9      printf("a = %i\n", a);
    10
    11      printf("&a = %p\n", &a);
    12
    13      return EXIT_SUCCESS;
    14
    15  }
    16
mimas$ 

mimas$ /usr/bin/sparc64-linux-gnu-gcc-9 -std=iso9899:1999 \
> -pedantic -pedantic-errors -fno-builtin -g -m64 -O0 \
> -mno-app-regs -mcpu=ultrasparc -mmemory-model=tso \
> -o foo_gcc-9 foo.c 
mimas$ 
mimas$ which gdb
/home/dclarke/local/bin/gdb
mimas$ 
mimas$ TERM=dumb LC_ALL=C /home/dclarke/local/bin/gdb ./foo_gcc-9
GNU gdb (GDB) 10.1
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "sparc64-unknown-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./foo_gcc-9...
(gdb) break foo.c:13
Breakpoint 1 at 0x878: file foo.c, line 13.
(gdb) run
Starting program: /home/dclarke/foo_gcc-9 
a = 1
&a = 0x7fefffff5bc

Breakpoint 1, main (argc=0, argv=0x0) at foo.c:13
13          return EXIT_SUCCESS;
(gdb) print a
$1 = 0
(gdb) print &a 
$2 = (int *) 0x7feffa5d49c
(gdb) cont
Continuing.
[Inferior 1 (process 53214) exited normally]
(gdb) quit
mimas$ 

I will attach two binaries : 

    1) foo_sparc64_gcc-10.xz  made with gcc 10.2.1

    2) foo_sparc64_gcc-9.xz   made with gcc 9.3.0

I may go get sources to a previous gdb release and see if I can build
and test.

Thank you so much for your kind attention to this.

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