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Message-ID: <MTAwMDAzNi5iaWxs.1581124920@quikprotect>
Date: Fri, 7 Feb 2020 20:22:00 -0500
Subject: Programs using std::filesystem with gcc 9.2.0 fail to run
From: velix AT bill DOT router5 DOT com
To: cygwin AT cygwin DOT com
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It's possible to compile and link programs that use std::filesystem with
the g++ 9.2.0 compiler for Cygwin.  For instance if I place the following
program into a file name "x.cpp":

    #include <iostream>
    #include <filesystem>

    int main()
    {
        std::filesystem::path p{"/tmp"};
        std::cout << p << std::endl;
    }

Then compile with:

    g++ -std=c++2a -Wall -O3 x.cpp

It builds successfully.  But running the output "a.exe" file exits
immediately with exit code 127.  It does not help if I also add
"-lstdc++fs" to the build command.

The output of "uname -a" is:
    CYGWIN_NT-6.1 price1 3.1.2(0.340/5/3) 2019-12-21 15:25 x86_64 Cygwin



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