LDC2 with -fxray-instrument

[Johan Engelen]

On Wednesday, 16 January 2019 at 23:29:45 UTC, Johan Engelen 
wrote:
> On Wednesday, 16 January 2019 at 22:10:14 UTC, Johan Engelen 
> wrote:
>> On Wednesday, 16 January 2019 at 17:36:31 UTC, Márcio Martins 
>> wrote:
>>> On Tuesday, 15 January 2019 at 22:51:15 UTC, Johan Engelen 
>>> wrote:
>>>> What platform are you on?
>>>
>>> Linux x64
>>
>> OK, so that should work. What is your testcase? Try with 
>> `-fxray-instruction-threshold=1` to also instrument small 
>> functions.
>
> I'm trying now and am having the same problem. I'm trying to 
> figure out how to fix LDC so that it works.
>
> work in progress!
>
> -Johan

OK, got it :-) LLVM 7 changed things a little, so it's broken 
with LDC 1.13  [*].

For now, you can use LDC 1.12 (LLVM 6). You also have to add 
`-L-lstdc++` as compiler flag. So with LDC 1.12, Linux, and this 
commandline things work for me:
```
ldc2 -fxray-instrument -fxray-instruction-threshold=1 xraytest.d 
-L-lstdc++
XRAY_OPTIONS="patch_premain=true xray_mode=xray-basic 
verbosity=1" xraytest
```

Happy testing,
   Johan

[*] XRay was split into several libraries, and we only copy+link 
with one of them. You can make things work by downloading the 
libs and linking with them.