RFR: 8242181: [Linux] Show source information when printing native stack traces in hs_err files [v8]

[Christian Hagedorn]

On Fri, 13 May 2022 10:04:25 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> I'm back to work again. I also had a look but could not find something on Google, either. I then skimmed through the old GCC manuals. I found the first occurrence of `-gdwarf-4` in the manual for GCC 4.5.4 [here](https://gcc.gnu.org/onlinedocs/gcc-4.5.4/gcc.pdf):
>> 
>> 
>> - gdwarf-version
>>     Produce debugging information in DWARF format (if that is supported). This
>>     is the format used by DBX on IRIX 6. The value of version may be either 2, 3
>>     or 4; the default version is 2.
>> 
>> While the manual for GCC 4.4.7 only mentions `-gdwarf-2`:
>> 
>> -gdwarf-2
>>     Produce debugging information in DWARF version 2 format (if that is supported). This is the format used by DBX on 
>>     IRIX 6. With this option, GCC
>>     uses features of DWARF version 3 when they are useful; version 3 is upward
>>     compatible with version 2, but may still cause problems for older debuggers.
>> 
>> 
>> The minimum accepted GCC version is currently 5.0 according to:
>> https://github.com/openjdk/jdk/blob/d5ae3833b1b71eb84fadb69c0c92851400f8921c/doc/building.md?plain=1#L341-L344
>> 
>> This suggests that all our supported GCC versions should accept `-gdwarf-4`.
>
> @chhagedorn Thanks for the research. You provide more than necessary reason to accept `-gdwarf-4` without any further checks.

Great, thanks for confirming this and reviewing the build changes!

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PR: https://git.openjdk.java.net/jdk/pull/7126