CODEWITHSUNDEEP
cclang
user10719814
user10719814

Reputation:

What does `-Wextra` flag mean in clang compiler?

What is the meaning of -Wextra in clang compiler flag?

I was curious what does all the flags such as -Wall, -Werror means. I was able to find answers for others, but not -Wextra.

clang -Wall -Wextra -Werror

Upvotes: 0

Views: 1800

Answers (2)

Waqar
Waqar

Reputation: 9366

-Wextra compiler flag is not just in clang but also in gcc. According to the gcc docs:

This enables some extra warning flags that are not enabled by -Wall. This option used to be called -W. The older name is still supported, but the newer name is more descriptive.

Source:

Upvotes: 2

Zain Arshad
Zain Arshad

Reputation: 1907

-Wextra flag is not specific to just the clang compiler, it is documented in the GCC Compiler as well. Basically, -Wall enables all (common) warning flags but this excludes many flags.

Some of these, notably -Wempty-init-stmt, -Wignored-qualifiers, -Winitializer-overrides, -Wmissing-field-initializers, -Wmissing-method-return-type, -Wnull-pointer-arithmetic, -Wsemicolon-before-method-body, -Wsign-compare, -Wunused-parameter are covered by -Wextra instead.

You can find out more about what each of these mean in the documentation.

Upvotes: 3

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