"missing debug info" for executable with compressed debug sections

[cout]

Nice work! Bloaty looks useful. I notice it complains about missing debug sections if the debug section is compressed, e.g.:

$ cat > test.cpp
int main() { }
$ g++ test.cpp -gdwarf -Wl,-fuse-ld=gold -Wl,--compress-debug-sections=zlib
$ ./bloaty ./a.out -d compileunits                                         
bloaty: missing debug info
$ ./bloaty ./a.out
     VM SIZE                       FILE SIZE
 --------------                 --------------
  20.8%     512 [ELF Headers]    2.75Ki  39.7%
   0.0%       0 .symtab             912  12.8%
   0.0%       0 .strtab             550   7.7%
  20.8%     512 .dynamic            512   7.2%
   0.0%       0 .shstrtab           413   5.8%
  16.6%     407 .text               407   5.7%
   9.6%     237 [Other]             271   3.8%
   9.9%     244 .eh_frame           244   3.4%
   6.9%     169 .dynstr             169   2.4%
   5.9%     144 .dynsym             144   2.0%
   0.0%       0 .zdebug_str         108   1.5%
   0.0%       0 .comment             79   1.1%
   0.0%       0 .zdebug_abbrev       73   1.0%
   0.0%       0 .zdebug_info         67   0.9%
   0.0%       0 .zdebug_line         64   0.9%
   2.1%      52 .eh_frame_hdr        52   0.7%
   2.0%      48 .plt                 48   0.7%
   2.0%      48 .rela.plt            48   0.7%
   1.8%      44 .hash                44   0.6%
   1.6%      40 .got.plt             40   0.6%
   0.0%       0 .zdebug_aranges      40   0.6%
 100.0%  2.40Ki TOTAL            6.93Ki 100.0%

It should either use the compressed debug section, or display a message that it cannot read compressed debug sections.

[haberman]

Makes sense!

I can't reproduce this on my system (even when I pass these arguments, gold isn't compressing for some reason). Do you know if these sections have SHF_COMPRESSED set per these docs? Maybe try readelf -S --wide a.out and paste the output here?

[haberman]

Here's a simple PR to just improve the error message: #55

[haberman]

True support for compressed debug sections was merged in #230 and #233.