Use the -g option to produce debug information. When you specify -g, the compiler disables optimizations by invoking -O0. Specifying the -g or -O0 option automatically enables the -fp option (IA-32 only). The -fp option disables using the EBP register as general purpose register.
If you specify -g with -O1, -O2, or -O3, then -fp is disabled and allows the compiler to use the EBP register as a general purpose register in optimizations. However, most debuggers expect EBP to be used as a stack frame pointer, and cannot produce a stack backtrace unless this is so. Using the -fp option can result in slightly less efficient code.
| Option(s) | Result |
|---|---|
| -g | Debugging information produced, -O0 enabled, -fp enabled for IA-32-targeted compilations. |
| -g -O1 | Debugging information produced, -O1 optimizations enabled, -fp disabled for IA-32-targeted compilations. |
| -g -O2 | Debugging information produced, -O2 optimizations enabled, -fp disabled for IA-32-targeted compilations. |
| -g -O3 | Debugging information produced, -O3 optimizations enabled, -fp disabled for IA-32-targeted compilations. |
| -g -O3 -fp | Debugging information produced, -O3 optimizations enabled, -fp enabled for IA-32-targeted compilations. |
| -ip | Symbols and line numbers produced for debugging. |
| -ipo | Symbols and line numbers produced for debugging. |