Hi cygwin users, I have cli program that I run with mintty. It is a simple C++ program, reading from cin and outputing to cout. It is cross-compiled as a mingw program. I've been running it without problems fro over 2 years. Recently, I updated cygwin to 3.1.4-1 and noticed the pcon support. Since then, the output of my program has been messy: output lines have intermittent gaps in them. I made a simple test case that reproduces the problem, from the following simple C++ file, hello.cpp :
#include <iostream>
using namespace std;
static string Green = "\033[32m";
static string Yellow = "\033[33m";
static string Reset = "\033[0m";
int main (int pArgc, char* pArgv[])
{
cout << "Hello!" << endl;
string answer;
do
{
cout << Yellow << "q to Quit, p to Print " << Reset;
cin >> answer;
cout << Yellow << "You answered: " << Reset << answer << endl;
if (answer[0] == 'p')
{
for (int i = 0; i < 30; ++i)
{
cout << Green << i << "\tA simple line of
printing in green characters." << Reset << endl;
}
}
} while (answer[0] != 'q');
cout << "Goodbye." << endl;
return 0;
}
Compiled with:
x86_64-w64-mingw32-c++ -g hello.cpp -o hello -static-libgcc -static-libstdc++
-Wl,-Bstatic -lstdc++ -lpthread -Wl,-Bdynamic
When run in mintty, it prompts you to answer q or p . q quits the program, p
prints 30 times the same line of green text.
With the new pcon support, often, everything is correct: 30 lines of green text
are outputted correctly; but most of the time a few lines will have gaps in
them or show a partial escape sequence, like this:
You answered: p
0 A simple line of printing in green characters.
1 A simple line of printing in green characters.
2 A simple line of printing in green characters.
3 A simple line of printing in green characters.
4 A simple line of printing in green characters.
5 A simple line of printing in green characters.
6 A simple line of printing in green characters.
7 A simple line of printing in green characters.
8 A simple line of printing in green characters.
9 A simple line of printing in green characters.
10 A simple line of printing in green characters.
11 A simple line of printing in green characters.
12 A simple line of printing in green characters.
13 A simple line of printing in green characters.
14 A simple line of printing in green characters.
15 A simple line of printing in green characters.
16 A simple line of printing in green characters.
17 A simple line of printing in green characters.
18 A simple line of printing in green characters.
19 A simple line of printing in green characters.
20 A simple line of printing in green characters.
21 A simple line of printing in green characters.
22 A simple line of printing in green characters.
23 A simple line of printing in green characters.
24 A simple line of printing in green characters.
25 A simple line of printing in green characters.
26 A simple line of printing in green characters.
27 A simple line of printing in green characters.
28 A simple line of printing in green characters.
[32m29 A simple line of printing in green characters.
q to Quit, p to Print p
You answered: p
0 A simple line of printing in green characters.
1 A simple line of printing in green characters.
2 A simple line of printing in green characters.
3 A simple line of printing in green characters.
4 A simple line of printing in green characters.
5 A simple line of printing in green characters.
6 A simple line of printing in green characters.
7 A simple line of printing in green characters.
8 A simple line of printing in green characters.
9 A simple line of printing in green characters.
10 A simple line of printing in green characters.
11 A simple line of printing in green characters.
12 A simple line of printing in green characters.
13 A simple line of printing in green characters.
14 A simple line of printing in green characters.
15 A simple line of printing in green characters.
16 A simple line of printing in green characters.
17 A simple line of printing in green characters.
18 A simple line of printing in green characters.
19 A simple line of printing in green characters.
20 A simple line of printing in green characters.
21 A simple line of printing in green characters.
22 A simple line of printing in green characters.
23 A simple line of printing in green characters.
24 A simple line of printing in green characters.
25 A simple line of printing in green characters.
26 A simple line of printing in green characters.
27 A simple line of printing in green characters.
28 A simple line of printing in green characters.
29 A simple line of printing in green characters.
q to Quit, p to Print q
If I start mintty with CYGWIN=disable_pcon and run the hello program in it,
everything is fine and the program always outputs correctly, as it did before I
updated cygwin.
CYGWIN=disable_pcon /usr/bin/mintty &
OK, no big deal then, I'll make a small bash script to automate this: hellobash
#/bin/bash
CYGWIN=disable_pcon /usr/bin/mintty absolutePath/hello.exe &
This is where it gets weird. Running ./hellobash sometimes gets the hello
program run correctly. It accepts input and displays output as expected. But in
about 1 in 5 runs, it will not accept input. A prompt is displayed, but no
cursor is shown and typing produces nothing. ^C does not stop the program.
Weirder: in about 1 in 20 to 30 runs, it's the converse: it will be stuck in a
loop as if input was continuously feed to it, even if you don't type anything.
Output of cygcheck -c is attached.
Regards,
- André Bleau
cygcheck.out
Description: cygcheck.out
-- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
