[Bug symtab/25858] [readnow] FAIL: gdb.ada/bp_c_mixed_case.exp: break <NoDebugMixedCaseFunc>

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25858

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
The minimal symbol NoDebugMixedCaseFunc has this address:
...
$ nm outputs/gdb.ada/bp_c_mixed_case/foo_h731_021 | grep NoDebugMixedCaseFunc
0000000000401f7a T NoDebugMixedCaseFunc
...
and originates from source file qux.c, which is compiled without debug info.

But during the process of setting the breakpoint, we try to find out the
source/line info for the function, and hit find_pc_sect_compunit_symtab, which
returns the symtab for crtn.S.

The corresponding CU in the debug info looks like this:
...
 <0><1ff76>: Abbrev Number: 1 (DW_TAG_compile_unit)
    <1ff77>   DW_AT_stmt_list   : 0x513d
    <1ff7b>   DW_AT_ranges      : 0x3490
    <1ff7f>   DW_AT_name        : ../sysdeps/x86_64/crtn.S
    <1ff83>   DW_AT_comp_dir    : /home/abuild/rpmbuild/BUILD/glibc-2.26/csu
    <1ff87>   DW_AT_producer    : GNU AS 2.32.0
    <1ff8b>   DW_AT_language    : 32769 (MIPS assembler)
...
and the DW_AT_ranges attribute refers to:
...
    00003490 ffffffffffffffff 0000000000000000 (base address)
    00003490 0000000000401822 0000000000401827
    00003490 000000000040dc98 000000000040dc9d
    00003490 <End of list>
...

So, the address of NoDebugMixedCaseFunc 0x401f7e doesn't fall in any of the two
ranges, but the global block for the CU has these
BLOCK_START/BLOCK_END/BLOCK_RANGES values:
...
(gdb) p /x b.startaddr
$8 = 0x401822
(gdb) p /x b.endaddr
$9 = 0x40dc9d
(gdb) p b->ranges
$10 = (blockranges *) 0x0
...
so find_pc_sect_compunit_symtab decides that the symbol is part of that CU.

Note btw that the static block does have ranges:
...
(gdb) p /x cust->blockvector->block[1].startaddr
$20 = 0x401822
(gdb) p /x cust->blockvector->block[1].endaddr
$21 = 0x40dc9d
(gdb) p cust->blockvector->block[1].ranges
$22 = (blockranges *) 0x1ca6860
(gdb) p /x cust->blockvector->block[1].ranges.range[0]
$24 = {startaddr = 0x401822, endaddr = 0x401827}
(gdb) p /x cust->blockvector->block[1].ranges.range[1]
$25 = {startaddr = 0x40dc98, endaddr = 0x40dc9d}
...

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