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Mar 8, 2024
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Update C2537 #4978

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12 changes: 4 additions & 8 deletions docs/error-messages/compiler-errors-2/compiler-error-c2537.md
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---
description: "Learn more about: Compiler Error C2537"
title: "Compiler Error C2537"
ms.date: "11/04/2016"
ms.date: "03/08/2024"
f1_keywords: ["C2537"]
helpviewer_keywords: ["C2537"]
ms.assetid: aee81d8e-300e-4a8b-b6c4-b3828398b34e
---
# Compiler Error C2537

'specifier' : illegal linkage specification

Possible causes:

1. The linkage specifier is not supported. Only the "C" linkage specifier is supported.

1. "C" linkage is specified for more than one function in a set of overloaded functions. This is not allowed.
The linkage specifier is not supported. Only the "C" and "C++" linkage specifiers are supported.

The following sample generates C2537:

```cpp
// C2537.cpp
// compile with: /c
extern "c" void func(); // C2537
extern "c" void func1(); // C2537
extern "C" void func2(); // OK
extern "C++" void func3(); // OK
```