Eric Postpischil

Eric Postpischil has asked 36 questions and find answers to 960 problems.

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About

Senior software engineer in Apple’s Vector and Numerics Group (retired).

Eric Postpischil questions

Why do GCC and Clang produce different output with variable length array?
How to fix "variable previously declared 'static' redeclared 'extern' error"? [duplicate]
Is an fscanf/scanf/sscanf conversion specification with assignment suppressed not a conversion?
Is GCC warning on const qualifier correct?
Is assigning to a union member from a different member in the same union defined by the C standard?
Why is _Alignof missing from the rule about converting an array to a pointer?
Why was SIGFPE used for integer arithmetic exceptions?
Is a redeclaration of an untagged structure a compatible type?
May C evaluate with multiple floating-point formats?
How are multiple prior declarations resolved for a new declaration with extern?

Eric Postpischil answers

extern variable prototype: comparison of array not equal to a null pointer is always true
strictly speaking, where does the scope of a label name starts and ends in C?
Would negative 0 be an issue in this situation?
passing argument 2 makes pointer from integer without a cast
Is casting to (void**) well-defined?
How to check whether a u64 number larger than 2 ^ 54 is divisible by f64 with the minimal precision loss?
Can the `restrict` keyword be used in the function definition only?
Is initialization an assignment expression?
Is (void*) ptr == ptr always true?
Does passing to a function two pointers pointed to members of the same union violate the strict aliasing rule? [duplicate]