Do I have a gcc optimization bug or a C code problem?

Question

Test the following code:

#include 
#include 
main()
{
    const char *yytext=\"0\";
    const float f=(float)atof(yytext);
    siz         


        

Answer 1

Aside the pointer alignments, you're expecting that sizeof(size_t)==sizeof(float). I don't think it is (on 64-bit Linux size_t should be 64 bits but float 32 bits), meaning your code will read something uninitialized.