[gdb/testsuite] Handle core without build-id in gdb.base/corefile-buildid.exp

On aarch64-linux (debian 12), when running test-case gdb.base/corefile-buildid.exp, I get:
...
expecting exec file "debugdir-exec/.build-id/ec/f10ec5d39648774f8c35d3cf757c8db52f5163"
info files^M
Local core dump file:^M
        `build-exec/corefile-buildid.core', file type elf64-littleaarch64.^M
        0x0000aaaac1d70000 - 0x0000aaaac1d71000 is load1^M
	...
        0x0000ffffffa8b000 - 0x0000ffffffaac000 is load16^M
(gdb) FAIL: gdb.base/corefile-buildid.exp: exec: info files
...

The problem is that the test-case expect the build-id to be available in the
core file, while it isn't.

Fix this by detecting that the build-id isn't available in the core file using eu-readelf, as in
gdb.base/coredump-filter-build-id.exp.

Tested on aarch64-linux.

Approved-By: Tom Tromey <tom@tromey.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/gdb/testsuite/gdb.base/corefile-buildid.exp b/gdb/testsuite/gdb.base/corefile-buildid.exp
index f9c85a8..1301986 100644
--- a/gdb/testsuite/gdb.base/corefile-buildid.exp
+++ b/gdb/testsuite/gdb.base/corefile-buildid.exp
@@ -217,7 +217,7 @@ proc locate_exec_from_core_build_id {corefile buildid suffix \
 # of shared and/or stripped/.debug executables.
 
 proc do_corefile_buildid_tests {args} {
-    global binfile testfile srcfile execdir sharedir
+    global binfile testfile srcfile execdir sharedir hex
 
     # Parse options.
     parse_args [list {sepdebug} {shared}]
@@ -266,6 +266,18 @@ proc do_corefile_buildid_tests {args} {
 	}
 	verbose -log "corefile is $corefile"
 
+	if { [catch "exec [gdb_find_eu-unstrip] -n --core $corefile" output] == 0 } {
+	    set line [lindex [split $output "\n"] 0]
+	    set binfile_re (?:[string_to_regexp $program_to_run]|\\\[(?:exe|pie)\\\])
+	    if { ![regexp "^${hex}\\+${hex} \[a-f0-9\]+@${hex}.*$binfile_re$" $line] } {
+		unsupported "build id for exec"
+		return
+	    }
+	} else {
+	    unsupported "eu-unstrip execution"
+	    return
+	}
+
 	# Grab the build-id from the binary, removing ".debug" from the end.
 	set buildid [build_id_debug_filename_get $program_to_run]
 	if {$buildid == ""} {