C keywords: extern

 

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Keywords

alignas (C23) alignof (C23) auto bool (C23) break case char const constexpr (C23)   continue default do double else enum	extern false (C23) float for goto if inline (C99) int long nullptr (C23) register restrict (C99)   return short signed	sizeof static static_assert (C23) struct switch thread_local (C23) true (C23) typedef typeof (C23) typeof_unqual (C23)   union unsigned void volatile while	_Alignas (C11*) _Alignof (C11*) _Atomic (C11) _BigInt (C23) _Bool (C99*) _Complex (C99) _Decimal128 (C23) _Decimal32 (C23) _Decimal64 (C23) _Generic (C11) _Imaginary (C99) _Noreturn (C11*) _Static_assert (C11*) _Thread_local (C11*)
conditionally-supported
asm	fortran

 

Usage

• static duration storage-class specifier with either internal or more usually external linkage.

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