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fc-full-path-of-source-code-file-in-diagnostics.md

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description Learn more about: /FC (Full path of source code file in diagnostics)
title /FC (Full path of source code file in diagnostics)
ms.date 04/26/2021
f1_keywords
VC.Project.VCCLCompilerTool.UseFullPaths
/FC
-FC
helpviewer_keywords
/FC compiler option [C++]
-FC compiler option [C++]
ms.assetid 1f11414e-cb42-421b-be68-9d369aab036b

/FC (Full path of source code file in diagnostics)

Causes the compiler to display the full path of source code files passed to the compiler in diagnostics.

Syntax

/FC

Remarks

Consider the following code sample, where the source file is located in C:\test\compiler_option_FC.cpp:

// compiler_option_FC.cpp

int main( ) {
   int i   // C2143
}

Without /FC, the compiler output looks similar to this diagnostic text:

  • compiler_option_FC.cpp(5): error C2143: syntax error: missing ';' before '}'

With /FC, the compiler output looks similar to this diagnostic text:

::: moniker range="<=msvc-150"

  • c:\test\compiler_option_fc.cpp(5): error C2143: syntax error: missing ';' before '}'

::: moniker-end ::: moniker range=">=msvc-160"

  • C:\test\compiler_option_FC.cpp(5): error C2143: syntax error: missing ';' before '}'

::: moniker-end

/FC is also needed if you want to see the full path of a file name when using the __FILE__ macro. For more information about __FILE__, see Predefined macros.

The /FC option is implied by /ZI. For more information about /ZI, see /Z7, /Zi, /ZI (Debug information format).

In Visual Studio 2017 and earlier versions, /FC outputs full paths in lower case. Starting in Visual Studio 2019, /FC uses the same casing as the file system for full paths.

To set this compiler option in the Visual Studio development environment

  1. Open the project's Property Pages dialog box. For details, see Set C++ compiler and build properties in Visual Studio.

  2. Select the Configuration Properties > C/C++ > Advanced property page.

  3. Modify the Use Full Paths property.

To set this compiler option programmatically

  • See xref:Microsoft.VisualStudio.VCProjectEngine.VCCLCompilerTool.UseFullPaths%2A.

See also

MSVC compiler options
MSVC compiler command-line syntax