catching segfault using try_ catch

[seany]

On Thursday, 22 July 2021 at 14:19:37 UTC, seany wrote:
> On Tuesday, 13 July 2021 at 17:49:54 UTC, Adam D Ruppe wrote:
>> On Tuesday, 13 July 2021 at 16:52:43 UTC, seany wrote:
>>> What will it return to me?
>>
>> true if it succeeded.
>>
>>> I want to catch the segfault and a segfault has occured, I 
>>> want run a different code at that point.
>>
>> You mean transparently rerun some code? That's better done 
>> with the lowlevel sigaction handler.
>>
>> But if you just want to standard try/catch then do something 
>> in the catch block, this is fine.
>>
>>
>> import etc.linux.memoryerror;
>>
>> void main() {
>>         registerMemoryErrorHandler();
>>         int* a;
>>         try {
>>                 *a = 4;
>>         } catch(Throwable e) {
>>                 import std.stdio;
>>                 writeln("Caught");
>>         }
>> }
>>
>>
>> It can be used on ldc2 too but it isn't as reliable since ldc 
>> considers null access to be undefined behavior anyway and thus 
>> may optimize out your catch....
>>
>> You also need to compile in the module with ldc so build it 
>> like
>>
>> $ ldc2 seg.d ~/d/ldc/import/etc/linux/memoryerror.d
>>
>> just including the memoryerror file o the command line lets it 
>> link.
>
>
> how can I specify this with dub ?
>
>
> If i do `dub build -b release --compiler=ldc2 
> /usr/include/dmd/druntime/import/etc/linux/memoryerror.d` ; I 
> get : `Package 
> '/usr/include/dmd/druntime/import/etc/linux/memoryerror.d' was 
> neither found locally nor online.`

I have added this to my dub.json :

     "mylib":{
                         "versions": "~master",
                         "path": 
"/usr/include/dmd/druntime/import/"
                 },


Result : 
`.dub/build/application-release-linux.posix-x86_64-ldc_v1.24.0-5496805BDFFAF7D74739CE42F7A6E3B0/tracker_ai.o:traits.d:function _D14analysisEngine9geoEngine15analyze_tillageMFZv: error: undefined reference to '_D3etc5linux11memoryerror26registerMemoryErrorHandlerFZb'
`