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From: "eblot.ml at gmail dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug gdb/26949] New: ELF target support seems broken on macOS 11
Date: Thu, 26 Nov 2020 10:00:32 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26949

            Bug ID: 26949
           Summary: ELF target support seems broken on macOS 11
           Product: gdb
           Version: 10.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: eblot.ml at gmail dot com
  Target Milestone: ---

On macOS 11 (Big Sur), when GDB is built with an ELF target, for example
--target=3Driscv64-unknown-elf, GDB builds successfully.

At runtime, when an ELF file is loaded in GDB, the following message is rai=
sed:

I'm sorry, Dave, I can't do that.  Symbol format `elf32-littleriscv' unknow=
n.

It appears that despite the successful build, GDB does not include ELF supp=
ort,
as
gdb/config.h contains `#undef HAVE_ELF`

The root cause seems to be the gdb/configure script that fails to valide BFD
ELF support, around line 16832 on GDB 10.1, although the same issue arise w=
ith
the previous GDB 9.2 release.

The generated conftest.c test fails as strncmp function is used, but <strin=
g.h>
has not been included. I have not checked why the test file works on Linux
hosts and not on macOS hosts.

Anyway, adding <string.h> to acinclude.m4 fixes the trouble on macOS, such =
as
with:

--- a/gdb/acinclude.m4  2020-11-26 10:10:52.000000000 +0100
+++ b/gdb/acinclude.m4  2020-11-26 10:12:25.000000000 +0100
@@ -362,6 +362,7 @@
   AC_CACHE_CHECK([$1], [$2],
   [AC_TRY_LINK(
   [#include <stdlib.h>
+  #include <string.h>
   #include "bfd.h"
   #include "$4"
   ],

although I have no idea if this is the proper way to fix it. At least GDB k=
eeps
building in macOS 11, and the resulting gdb application is able to load ELF
files.

As a side note, is it an expected behaviour that building for an explicit E=
LF
target completes successfully although ELF support cannot be included?

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