What's in the -p and -g flag

Question

I profiled C code, and for this I compiled the -p and -g flags. So, I wandered what these flags actually do, and what kind of premium do they add to the binary? Thanks

Answer 1

-pprovides information for prof, and -pgprovides information for gprof.

Let's look at the last one. It explains how it worksgprof , but let me condense it here.

When routine B is compiled with -pg, some code is inserted at the entry point to the program that looks at which program calls it, for example A. Then it increments a counter saying A is called B.

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Answer 2

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http://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html#Debugging-Options

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