New posts in undefined-behavior

Why does this loop produce "warning: iteration 3u invokes undefined behavior" and output more than 4 lines?

c++ gcc undefined-behavior

May I treat a 2D array as a contiguous 1D array?

c++ arrays pointers multidimensional-array undefined-behavior

Why does left shift operation invoke Undefined Behaviour when the left side operand has negative value?

c++ c language-lawyer undefined-behavior bit-shift

Why does this for loop exit on some platforms and not on others?

c debugging undefined-behavior buffer-overflow

Detecting signed overflow in C/C++

c++ c undefined-behavior signed integer-overflow

Uninitialized variable behaviour in C++

c++ initialization undefined-behavior

Is `reinterpret_cast`ing between hardware SIMD vector pointer and the corresponding type an undefined behavior?

c++ x86 language-lawyer undefined-behavior intrinsics

Why is f(i = -1, i = -1) undefined behavior?

c++ language-lawyer undefined-behavior

Is a^a or a-a undefined behaviour if a is not initialized?

c undefined-behavior

Is the "struct hack" technically undefined behavior?

c undefined-behavior c89

Do I need to cast to unsigned char before calling toupper(), tolower(), et al.?

c++ language-lawyer undefined-behavior toupper tolower

Can we change the value of an object defined with const through pointers?

c constants undefined-behavior

Is uninitialized local variable the fastest random number generator?

c++ c undefined-behavior garbage

Does initialization entail lvalue-to-rvalue conversion? Is `int x = x;` UB?

c++ initialization undefined-behavior language-lawyer

Optimizing away a "while(1);" in C++0x

c++ loops c++11 language-lawyer undefined-behavior

Linking functions with different return types

c undefined-behavior linkage function-declaration

Is signed integer overflow still undefined behavior in C++?

c++ c++11 undefined-behavior integer-overflow

Why is unsigned integer overflow defined behavior but signed integer overflow isn't?

c++ c undefined-behavior integer-overflow

Does the C++ standard allow for an uninitialized bool to crash a program?

c++ llvm undefined-behavior abi llvm-codegen

Does "Undefined Behavior" really permit *anything* to happen? [duplicate]

c++ c language-lawyer undefined-behavior