A small list of GCC Hacks

1. g++ -o helloworld helloworld.cc produces helloworld binary from helloworld.cc C++ file.

2. use -Wall switch turns on all warnings(potential errors) in the code (like unused variables)

3. g++ -E helloworld.cc generates output code after the pre-processing stage.

4. use -O1 switch for level 1 optimization and -O3 for level 3 optimization (very rigorous)

5. use -Os switch for generating code which is small in size

6. g++ -S helloworld.cc generates asm code helloworld.S

7. g++ -DNAME=“ashish” helloworld.cc equivalent to writing #define NAME ashish in the code.

8. cpp -dM /dev/null lists all gcc macros available on the system as a part of GCC standard (they all starts with two underscores)

Reference

1. GCC man page
2. CPP man page