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gcc.gnu 3.8 Options to Request or Suppress Warnings

Request or Suppress Warnings

You can request many specific warnings with options beginning with ‘-W’, for example -Wimplicit to request warnings on implicit declarations. Each of these specific warning options also has a negative form beginning ‘-Wno-’ to turn off warnings; for example, -Wno-implicit. This manual lists only one of the two forms, whichever is not the default. For further language-specific options also refer to C++ Dialect Options and Objective-C and Objective-C++ Dialect Options. Additional warnings can be produced by enabling the static analyzer; See Static Analyzer Options.

NOTE:

1、这总结的是"Request or Suppress Warnings"的模式

-Wall

NOTE:

1、它并没有开启所有的warning，它只开启了部分warning

-Wextra

stackoverflow Suppress -Wunknown-pragmas warning in GCC

A

I've run into this annoyance, too. According to the GCC manpage -Wall turns on -Wunknown-pragmas for you, so just manually disable it using -Wno-unknown-pragmas after -Wall.

There is a GCC feature request to make this work using #pragma GCC diagnostic:

1、C++ preprocessor ignores #pragma GCC diagnostic

TODO

stackoverflow GCC does not honor 'pragma GCC diagnostic' to silence warnings [duplicate]