Useful Gcc Commandline Switches

Cynbe ru Taren

Gcc has hundreds of commandline switches; figuring out which ones are useful when debugging gcc is no small task.

Here are a few key ones. For details on any of them see GCC Command Options.

• To generate pass-by-pass dumps: -fdump-tree-all -fdump-ipa-all -fdump-rtl-all
• Same? (Undocumented): -da
• To generate bigger pass-by-pass dumps: -fdump-tree-all-all -fdump-ipa-all-all -fdump-rtl-all-all
• To generate verbose assembly code: -fverbose-asm
• To generate RTL-annotated assembly code: -S -dP
• To save tmpfiles, in particular the critical foo.i preprocessed file: --save-temps
• To suppress (for example) the ivopts pass: -fno-ivopts
• To show the critical cc1 commandline: -###
• To show linker actions: -Wl,--verbose
• To generate position-independent code: -fPIC
• Recommended by gcc.gnu.org/wiki/DebuggingGCC: -dAp -Wa,-a

For more suggestions see Options for Debugging Your Program or GCC.

[ Back to Cynbe's Gcc Debugging Hints ]