[jira] [Resolved] (IMPALA-11511) Provide an option to build with compressed debug info

["Joe McDonnell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-11511?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joe McDonnell resolved IMPALA-11511.
------------------------------------
    Fix Version/s: Impala 4.2.0
       Resolution: Fixed

> Provide an option to build with compressed debug info
> -----------------------------------------------------
>
>                 Key: IMPALA-11511
>                 URL: https://issues.apache.org/jira/browse/IMPALA-11511
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>    Affects Versions: Impala 4.2.0
>            Reporter: Joe McDonnell
>            Assignee: Joe McDonnell
>            Priority: Major
>             Fix For: Impala 4.2.0
>
>
> For builds with debug information, the debug information is often a large portion of the binary size. There is a feature that compresses the debug info using ZLIB via the "-gz" compilation flag. It makes a very large difference to the size of our binaries:
> {noformat}
> GCC 7.5:
> debug: 726767520
> debug with -gz: 325970776
> release: 707911496
> with with -gz: 301671026
> GCC 10.4:
> debug: 870378832
> debug with -gz: 351442253
> release: 974600536
> release with -gz: 367938487{noformat}
> The size reduction would be useful for developers, but support in other tools is mixed. gdb has support and seems to work fine. breakpad does not have support. However, it is easy to convert a binary with compressed debug symbols to one with normal debug symbols using objcopy:
> {noformat}
> objcopy --decompress-debug-sections [in_binary] [out_binary]{noformat}
> Given a minidump, it is possible to run objcopy to decompress the debug symbols for the original binary, dump the breakpad symbols, and then process the minidump successfully. So, it should be possible to modify bin/dump_breakpad_symbols.py to do this automatically.



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