[gdb/testsuite] Fix gdb.dwarf2/macro-source-path.exp with -m32

With test-case gdb.dwarf2/macro-source-path.exp and target board unix/-m32, I
run into:
...
as: macro-source-path-gcc11-ld238-dw5-filename-641.o: \
  unsupported relocation type: 0x1^M
...

The problem is that we have 64-bit dwarf so the debug_line offset in the
.debug_macro section is an 8-byte entity, emitted using ".8byte":
...
        .section .debug_macro
.Lcu_macros4:
        .2byte        5                 /* version */
        .byte        3                  /* flags */
        .8byte        .LLlines3         /* debug_line offset */
...
but the linker doesn't support 8-byte relocation types on a 32-bit architecture.

This is similar to what was fixed in commit a5ac8e7fa3b
("[gdb/testsuite] Fix 64-bit dwarf test-cases with -m32") for for instance
.debug_abbrev.

Fix this in the same way, by using _op_offset to emit the debug_line offset.

Tested on x86_64-linux with native and target board unix/-m32.

1 files changed, 2 insertions, 5 deletions

diff --git a/gdb/testsuite/lib/dwarf.exp b/gdb/testsuite/lib/dwarf.exp
index b85ec29..586c98e 100644
--- a/gdb/testsuite/lib/dwarf.exp
+++ b/gdb/testsuite/lib/dwarf.exp
@@ -2224,11 +2224,8 @@ namespace eval Dwarf {
 	_op .byte $flags "flags"
 
 	if { ${debug-line-offset-label} != "" } {
-	    if { ${is-64} } {
-		_op .8byte ${debug-line-offset-label} "debug_line offset"
-	    } else {
-		_op .4byte ${debug-line-offset-label} "debug_line offset"
-	    }
+	    _op_offset [expr ${is-64} ? 8 : 4] ${debug-line-offset-label} \
+		"debug_line offset"
 	}
 
 	with_override Dwarf::define Dwarf::_macro_unit_define {