For questions about (suspected) incorrect behavior of a compiler. Use with the appropriate language tag and, where applicable, with the tag for the compiler in question.
Questions tagged [compiler-bug]
309 questions
1
vote
2 answers
Can't get Java enum that implements interface which extends another interface to compile
I want to create an enum that implements I2, which extends I1:
package a;
import static a.E1.E1A;
interface I1 extends I1 {}
interface I2 extends I1 {}
enum E1 implements I2 { E1A, A1B; }
class A {
public static void main(String[] args) {
…
Dog
- 7,707
- 8
- 40
- 74
1
vote
1 answer
VS2012 - Decltype as template parameter in trailing return type
The following code works on gcc and even VC11 Nov CTP, but fails to compile with VC11 RTM.
template
struct A {
typedef typename T::Type BreakMe;
T x;
};
struct B { typedef int Type; };
template
struct C {
static…
Leszek Swirski
- 51
- 4
1
vote
3 answers
Why empty assignment compiled with no errors
Here is my snippet:
var country = BLLocations.Instance.GetCountries();
ddlCountry.DataSource =
ddlCountry.DataTextField = "Country";
ddlCountry.DataValueField = "CountryCode";
ddlCountry.DataBind();
See the second line:
ddlCountry.DataSource =…
Moons
- 3,833
- 4
- 49
- 82
0
votes
1 answer
Calling function type alias instead of function
Consider the following code:
#include
using f = void(std::string);
void fcorrect(f func, std::string s) {
func(s); // calling function
};
void fmistake(f func, std::string s) {
f(s); // calling type alias instead of…
vtm11
- 165
- 1
- 9
0
votes
0 answers
alignas attribute ignored when address sanitizer is used -- gcc bug?
GCC codegen doesn't seem to align stack variables with the specified alignment value, when the address sanitizer is used.
The following code causes an assertion failure on g++ (GCC) 13.1.1 20230429, arch x86_64 GNU/Linux, when the flag…
0
votes
1 answer
Compiler bug when implementing core::fmt::Write
When implementing core::fmt::Write for an avr serial monitor, calling unwrap on write_str writes what looks like a compiler error to the output. Calling write_fmt in any capacity crashes, but I think these problems might be related. I'm using a…
Kestrel
- 3
- 2
0
votes
0 answers
Different behavior with user defined default constructor (only MSVC)
I came across the following problem, with two classes X and Y where Y has a member of type X
If I then:
create a vector of objects of type Y via std::vector list = {{}}
and Y has a defaulted default constructor
One of the instances of type X…
Michael Schmitt
- 149
- 9
0
votes
1 answer
Why do I get different results for complex multiplication involving NaN with gcc depending on optimisation level?
Consider the following code:
#include
#include
#include
int main()
{
complex double A = CMPLX(-NAN, 0.0);
complex double B = CMPLX(NAN, 0.0);
printf("A = %e %e, B = %e %e\n", creal(A), cimag(A), creal(B),…
fuz
- 88,405
- 25
- 200
- 352
0
votes
1 answer
Xcode 13.3 Compiler Bug with multiple nil coalescing operators?
A colleague came up with an issue with the nil coalescing operator starting with Xcode 13.3 and 13.3.1 (Swift 5.6), which I was able to reproduce.
The following example always crashes, but worked fine till Xcode 13.2.1.
fileprivate typealias Closure…
Frederik Winkelsdorf
- 4,383
- 1
- 34
- 42
0
votes
0 answers
Why does the latest Clang still report missing default argument on a parameter pack?
#include
enum Math { ONE };
template
iammilind
- 68,093
- 33
- 169
- 336
0
votes
0 answers
gcc not catching blatant uninitialized variable
I'm compiling this code with gcc 11.2.0 and the -Wuninitialized switch, but I don't get any warning in spite of bar_uninitialized being used uninitialized:
#include
#include
using std::vector;
using std::cout;
void foo(int…
Jabberwocky
- 48,281
- 17
- 65
- 115
0
votes
0 answers
Why MSVC still compiles to error for calling a method after removing const-ness of the object?
To avoid complexity, below is a minimal example. For some reason, I have to pass normal object as const to some method and use it as such:
#include
#define CALL(OBJECT, METHOD) \
…
iammilind
- 68,093
- 33
- 169
- 336
0
votes
0 answers
Why is GCC not allowing me to capture something by reference, while Clang allows it?
This is with C++20 (-std=c++20), GCC 10.2.0 and Clang 11.1.0.
I have a class Graph with a data member prefix_to_presufs. In my code, I make a std::unique_ptr to a Graph like so:
auto gr{std::make_unique()};
then I try to do this:
auto…
user2373145
- 332
- 2
- 14
0
votes
1 answer
Cortex-M compiler generates improper FOR loop
Tested and reproduced on Cortex-M 4 and Cortex-M 0.
I have discovered an issue with the GCC compiler. When a function is declared as type int (non-void), and contains a for loop, but does not have a return statement, the for loop will not break;…
Starwhip
- 1
0
votes
1 answer
Specifyin "enum" in a using statement - does it make a difference?
A "sanity check" question for language lawyers / nitpickers:
In this snippet of code:
enum my_enum { AValue1, AValue2 };
using alias_1 = enum my_enum;
using alias_2 = my_enum;
can there be any sort of difference between alias_1 and alias_2? That…
einpoklum
- 118,144
- 57
- 340
- 684