[Bug breakpoints/13415] Invalid breakpoints when linking with --gc-sections

["tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=13415

--- Comment #9 from Tom Tromey <tromey at sourceware dot org> ---
Note there's also bug #12528 on this topic.  And, patches did go in
to fix some problems with --gc-sections.

In the program that fails for me, the CU looks like:

 <0><199f>: Abbrev Number: 2 (DW_TAG_compile_unit)
    <19a0>   DW_AT_producer    : (indirect string, offset: 0x27da): GNU Ada
11.2.1 20210728 (Red Hat 11.2.1-1) -O -gnatez -gnatea -g -ffunction-sections
-gnatez -mtune=generic -march=x86-64
    <19a4>   DW_AT_language    : 13     (ADA 95)
    <19a5>   DW_AT_name        : (indirect line string, offset: 0x10d):
pack.adb
    <19a9>   DW_AT_comp_dir    : (indirect line string, offset: 0x0):
/home/tromey/AdaCore/gdb-testsuite/tests/KB21-043__bp_next_to_generic_fun
    <19ad>   DW_AT_ranges      : 0x63
    <19b1>   DW_AT_low_pc      : 0x0
    <19b9>   DW_AT_stmt_list   : 0x29e


low_pc == 0x0 is fishy, especially considering this is a native
Linux executable and not some embedded thing where it might make sense.

Also in the ranges:

    00000063 0000000000000000 000000000000003d 
    0000006d <End of list>

which is also pretty weird.

Maybe gdb ought to reject this entire CU, at least for purposes of
the line table.

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