What are some of the most commonly used gcc/g++ flags for information (not just optimization)

Question

我发现-E对于查看预处理器输出和调试宏非常有用，并且我已经看到-fdump-class-hierarchy查看类层次结构的v表...我知道也有一些标志可以转储asm输出..还有哪些类似于这些的广泛（或也许有点未知，但非常方便）的标志？

Answer 1

Few flags which I like:

-x language : used to compile file with extension other than .c or .cpp

-s - dump asm.

-g - debug build.

gcc -O3 -Q --help=optimizers | grep disabled gcc -O3 -Q --help=optimizers | grep disabled - will give you all optimization flags which remain diabled even after -O3

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