What is the method to verify if gcc is optimizing tail-recursion?

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One method to verify if GCC is optimizing tail-recursion is to compile the code with the optimization flag "-O2" using the command "gcc -O2 filename.c -o outputfile". After that, use the command "objdump -d outputfile" to see the assembly code. If the tail-recursion has been optimized, there should be a "jmp" instruction instead of a "call" instruction at the end of the recursive function. Another method is to use the flag "-S" instead of "-c" while compiling, which will generate the assembly code in a separate file. You can then look at the assembly code to see if the tail-recursion has been optimized.