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[gdb/build] Fix x86_64 x32 build

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A build error on x86_64 with x32 abi was reported here (
https://sourceware.org/pipermail/gdb/2021-November/049787.html ):
...
gdb/nat/amd64-linux-siginfo.c:280:42: error: \
  'struct compat_x32_siginfo_t::<unnamed union>::<unnamed>' has no member \
  named 'si_addr_bnd'
280 | #define cpt_si_lower _sifields._sigfault.si_addr_bnd._lower
| ^~~~~~~~~~~
gdb/nat/amd64-linux-siginfo.c:337:38: note: in expansion of macro 'cpt_si_lower'
337 | to->cpt_si_lower = from_ptrace.cpt_si_lower;
| ^~~~~~~~~~~~
...

The problem is that code added in commit d3d7d1ba3bb "[gdb/tdep] Handle
si_addr_bnd in compat_siginfo_from_siginfo" doesn't compile on an x86_64 x32
setup, because compat_x32_siginfo_t doesn't have the si_addr_bnd fields.

Fix this conservatively by disabling the code for x32.

Tested on x86_64-linux.
This commit is contained in:
Tom de Vries
2021-11-22 12:21:46 +01:00
parent 577bf39f10
commit a92d031d7e
1 changed files with 4 additions and 0 deletions
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4
gdb/nat/amd64-linux-siginfo.c
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@ -330,6 +330,9 @@ compat_siginfo_from_siginfo (compat_siginfo_t *to, const siginfo_t *from)
to->cpt_si_pid = from_ptrace.cpt_si_pid;
to->cpt_si_uid = from_ptrace.cpt_si_uid;
}
#ifndef __ILP32__
/* The struct compat_x32_siginfo_t doesn't contain
cpt_si_lower/cpt_si_upper. */
else if (to->si_code == SEGV_BNDERR
&& to->si_signo == SIGSEGV)
{
@ -337,6 +340,7 @@ compat_siginfo_from_siginfo (compat_siginfo_t *to, const siginfo_t *from)
to->cpt_si_lower = from_ptrace.cpt_si_lower;
to->cpt_si_upper = from_ptrace.cpt_si_upper;
}
#endif
else if (to->si_code < 0)
{
to->cpt_si_pid = from_ptrace.cpt_si_pid;