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While investigating PR25862 (an assertion failure with target board
cc-with-debug-names), I noticed that the .debug_aranges section in
gdb.mi/dw2-ref-missing-frame-func.c contains a hardcoded 0:
...
" .4byte 0 \n" // .Ldebug_info0 - Offset of Compilation Unit Info
...
So when looking for an address in the range 0x4004a7-0x4004bf, we should find
the CU at 0xc7:
...
Compilation Unit @ offset 0xc7:
Length: 0xba (32-bit)
Version: 2
Abbrev Offset: 0x64
Pointer Size: 4
<0><d2>: Abbrev Number: 1 (DW_TAG_compile_unit)
<d3> DW_AT_high_pc : 0x4004bf
<d7> DW_AT_low_pc : 0x4004a7
<db> DW_AT_name : file1.txt
<e5> DW_AT_producer : GNU C 3.3.3
<f1> DW_AT_language : 1 (ANSI C)
...
but instead the .debug_aranges entry points us to the CU at 0x0:
...
Length: 28
Version: 2
Offset into .debug_info: 0x0
Pointer Size: 4
Segment Size: 0
Address Length
004004a7 00000018
00000000 00000000
...
Fix this by using a label to refer to the start of the CU, similar to how
that's done for gdb.dlang/watch-loc.c in the fix for PR24522:
...
" .4byte .Lcu1_begin\n" // .Ldebug_info0 - Offset of Compilation Unit Info
...
The label marks the start of the empty .debug_info section for
dw2-ref-missing-frame-func.c, which is supposed to merge with the .debug_info
section in dw2-ref-missing-frame.S, so in order for that to work, we need to
make sure dw2-ref-missing-frame-func.o comes before dw2-ref-missing-frame.o in
the link line.
Tested on x86_64-linux.
gdb/testsuite/ChangeLog:
2020-04-22 Tom de Vries <tdevries@suse.de>
* gdb.mi/dw2-ref-missing-frame-func.c (.debug_aranges): Fix
debug_info_offset.
* gdb.mi/dw2-ref-missing-frame.exp: Make sure $objfuncfile comes
before $objsfile in the line line.
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