* Programs using std::filesystem with gcc 9.2.0 fail to run
@ 2020-02-08 1:22 velix
2020-02-08 13:46 ` Csaba Raduly
0 siblings, 1 reply; 2+ messages in thread
From: velix @ 2020-02-08 1:22 UTC (permalink / raw)
To: cygwin
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
--
Problem reports: http://cygwin.com/problems.html
FAQ: http://cygwin.com/faq/
Documentation: http://cygwin.com/docs.html
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Programs using std::filesystem with gcc 9.2.0 fail to run
2020-02-08 1:22 Programs using std::filesystem with gcc 9.2.0 fail to run velix
@ 2020-02-08 13:46 ` Csaba Raduly
0 siblings, 0 replies; 2+ messages in thread
From: Csaba Raduly @ 2020-02-08 13:46 UTC (permalink / raw)
To: cygwin list
On Sat, Feb 8, 2020 at 2:22 AM <velix@bill.router5.com> wrote:
> 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.
>
Works just fine wih me:
$ g++ -std=c++2a -Wall -O3 fsys.cpp
$ ./a.exe
"/tmp"
Try running yours under gdb. You may get some more useful information about
the error.
Csaba
--
You can get very substantial performance improvements
by not doing the right thing. - Scott Meyers, An Effective C++11/14 Sampler
So if you're looking for a completely portable, 100% standards-conformant
way
to get the wrong information: this is what you want. - Scott Meyers
(C++TDaWYK)
--
Problem reports: http://cygwin.com/problems.html
FAQ: http://cygwin.com/faq/
Documentation: http://cygwin.com/docs.html
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2020-02-08 13:46 ` Csaba Raduly
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