On 08/25/2018 12:13 AM, Steven Penny wrote:
> On Fri, 24 Aug 2018 10:11:42, JonY wrote:
>> Can you try breaking it down by phases?
>> 1. Preprocessor phase with -E -o file.ii
> 
>    $ time x86_64-w64-mingw32-g++ -E -o file.ii stoi.cpp; wc -c file.ii
>    real    0m0.172s
>    719550 file.ii
> 
>> 2. Compile phase (compile output from phase 1) with -c
> 
>    $ time x86_64-w64-mingw32-g++ -c file.ii; wc -c file.o
>    real    0m0.312s
>    7368 file.o
> 
>> 3. Link phase, point gcc to the output from phase 2.
> 
>    $ time x86_64-w64-mingw32-g++ -static file.o; wc -c a.exe
>    real    0m1.950s
>    11906797 a.exe
> 
> Also it might be worth noting the starting point - for some reason
> Cygwin is 4
> times larger than Msys2?
> 
>    $ wc -c /lib/gcc/x86_64-w64-mingw32/7.3.0/libstdc++.a
>    22446354 /lib/gcc/x86_64-w64-mingw32/7.3.0/libstdc++.a
> 
>    $ wc -c mingw64/lib/gcc/x86_64-w64-mingw32/8.2.0/libstdc++.a
>    5597192 mingw64/lib/gcc/x86_64-w64-mingw32/8.2.0/libstdc++.a
> 

Can you roll back to the previous x86_64-w64-binutils and find out if it
makes a difference?

Other than that, I'm quite out of ideas.