Can the C preprocessor be used to tell if a file exists?

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Little Update

Some compilers might support __has_include ( header-name ).

The extension was added to the C++17 standard (P0061R1).

Compiler Support

  • Clang
  • GCC from 5.X
  • Visual Studio from VS2015 Update 2 (?)

Example (from clang website):

// Note the two possible file name string formats.
#if __has_include("myinclude.h") && __has_include(<stdint.h>)
# include "myinclude.h"
#endif

Sources

  • SD-6: SG10 Feature Test Recommendations
  • Clang Language Extensions

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