Eric Postpischil

Eric Postpischil has asked 36 questions and find answers to 930 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

Can function pointers point to functions with differing argument const-ness in C
Does a character have to be casted to unsigned char before being compared to getc family returns?
C - Should I use quotes or brackets to include headers in a separate directory
Should two programs compiled with -O0 and -O2 each produce identical floating point results?
How low can a delta value be to compare two 32-bit floating point values?
behavior when for-loop variable overflow and compiler optimization
Does a restrict-qualified pointer parameter of a function allow optimization of the caller functions?
Why does using uint64_t array indices rather than uint32_t simplify compiler output?
Accessing a union defined as a type
Does bit shift automatically promote chars to int? [duplicate]