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Message-ID: <5b82c49c.1c69fb81.386aa.c401@mx.google.com>
Date: Sun, 26 Aug 2018 08:17:48 -0700 (PDT)
From: Steven Penny <svnpenn@gmail.com>
To: cygwin@cygwin.com
Subject: Re: [ANNOUNCEMENT] [Updated] mingw64-{i686,x86_64}-gcc-7.3.0-1 (Test)
References: <58485808-126c-888c-a41a-2d211660dd10@gmail.com>
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User-Agent: Tryst/2.8.0 (cup.github.io/tryst)

On Sun, 26 Aug 2018 12:51:40, JonY wrote:
> 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.

Using this file:

    $ cat stoi.cpp
    #include <iostream>
    #include <string>
    main() {
      std::cout << std::stoi("3.14159") << std::endl;
    }

and these:

    mingw64-x86_64-gcc-g++ 7.3.0
    mingw64-x86_64-gcc-core 7.3.0

and mingw64-x86_64-binutils 2.29.1:

    $ time x86_64-w64-mingw32-g++ -static stoi.cpp; wc -c a.exe
    real    0m2.337s
    11577536 a.exe

now with mingw64-x86_64-binutils 2.28.1:

    $ time x86_64-w64-mingw32-g++ -static stoi.cpp; wc -c a.exe
    real    0m2.300s
    11577470 a.exe

now with mingw64-x86_64-binutils 2.25.0:

    $ time x86_64-w64-mingw32-g++ -static stoi.cpp; wc -c a.exe
    real    0m2.350s
    11577536 a.exe

Going back to my original theory - it seems something is wrong with
"libstdc++.a", and has been for some time. Here a summation of the Cygwin
versions:

    Name: libstdc++.a
    Name: usr\lib\gcc\x86_64-w64-mingw32\7.3.0\
    Size: 22 446 354

    Name: libstdc++.a
    Name: usr\lib\gcc\x86_64-w64-mingw32\6.4.0\
    Size: 22 066 330

    Name: libstdc++.a
    Name: usr\lib\gcc\x86_64-w64-mingw32\6.3.0\
    Size: 22 034 356

    Name: libstdc++.a
    Name: usr\lib\gcc\x86_64-w64-mingw32\5.4.0\
    Size: 20 719 186

Compare this with Msys2:

    Name: libstdc++.a
    Name: mingw64\lib\gcc\x86_64-w64-mingw32\7.3.0\
    Size: 5 596 296

or with Debian:

    Name: .\usr\lib\gcc\x86_64-w64-mingw32\7.3-posix\
    Name: libstdc++.a
    Size: 5 093 564

Or Ubuntu:

    Name: .\usr\lib\gcc\x86_64-w64-mingw32\7.3-posix\
    Name: libstdc++.a
    Size: 5 085 236

References:

- http://mirror.rit.edu/cygwin/x86_64/release/mingw64-x86_64-gcc/mingw64-x86_64-gcc-g%2b%2b
- http://packages.debian.org/buster/g++-mingw-w64-x86-64
- http://packages.ubuntu.com/hu/bionic/g++-mingw-w64-x86-64
- http://repo.msys2.org/mingw/x86_64


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