Fork#41753: -O2 Bug Infinite Loop
Open Date: 2021-03-12 19:07
Last Update: 2021-03-12 22:32
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/41753
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Last Changes/Comment on this Ticket:
2021-03-12 22:32 Updated by: keith
* Status Update from Open to Closed
* Resolution Update from None to Rejected
* Milestone Update from Create a 64bit build environment for the MinGW.org project. to (None)
* Severity Update from 9 - Highest to 1 - Lowest
* Priority Update from 9 - Highest to 1 - Lowest
* Details Updated
Comment:
Several comments:
What part of the instruction: "priority is to be assigned only by an approved MinGW developer" do you not understand? You are not such a developer. Thus your attempt to escalate priority guarantees that this ticket will be treated as lowest priority.
This is not specifically a MinGW bug. Yes, I can see that it misbehaves as you suggest, but it exhibits similar misbehaviour when I compile it as a native GNU/Linux application, (using GCC-10.2 on Manjaro Linux). If you want it pursued, you need to raise the issue on the GCC bug tracker.
You really should not use #include <bits/stdc++.h> directly in user code; that's an internal-use header. In this example, you should be using #include <iostream>.
If I compile your code, I see a warning about a missing return statement, in your non-void f() function. Address that warning, either by adding the missing return statement, or by declaring void f(), and the misbehaviour does not occur.
Given the above, I am not going to pursue this.
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Ticket Status:
Reporter: first_last
Owner: (None)
Type: Issues
Status: Closed
Priority: 1 - Lowest
MileStone: (None)
Component: GCC
Severity: 1 - Lowest
Resolution: Rejected
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Ticket details:
This Piece of Code is getting Stuck In Infinite Loop when Using -O2 Flag
#include <bits/stdc++.h> using namespace std; typedef long long int ll; ll f() { for (int i = 0; i < 3; i++) { for (int j = 0; j < 2; j++) { cout << i << " " << j << endl; } } } int main() { f(); return 0; }
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