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The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.
The latest version of this topic can be found at Significant Characters with External Linkage.
ANSI 3.1.2** The number of significant characters with external linkage
Identifiers declared extern in programs compiled with Microsoft C are significant to 247 characters. You can modify this default to a smaller number using the /H (restrict length of external names) option.