undefined identifier FILE for mingw

[Innot Sagg]

On Monday, 6 July 2020 at 20:57:31 UTC, Innot Sagg wrote:
> On Monday, 6 July 2020 at 20:55:29 UTC, Innot Sagg wrote:
>> I apply this 
>> https://github.com/ldc-developers/druntime/pull/106 fix the 
>> issue.
>>
>>
>> when I try build the betterC app, I get a lot undefined 
>> symbol(same code work well on linux and osx):
>>
>>
>> .__postblit()
>> .__fieldPostblit()
>> .__ctor()
>
>
> this is the after ddemangle message. the original symbol is 
> like:
>
> Test__postblitMFZv
> Test__fieldPostblitMFNaNbNiNfZv


This error is throw when build with lto,  remove lto fix it.