PRB: Using #define to Specify Include File Fails with C2006 (115857)

SYMPTOMS

When compiling the source below using precompiled headers, you may get the following error from the C/C++ compiler for MS-DOS under Windows:

error C2006: #include expected a filename, found 'identifier'

or the following error from the C/C++ compiler for MS-DOS under Windows NT:

fatal error C1001: internal compiler error
(compiler file 'msc1.cpp', line 585)

or the following errors when compiling with Microsoft Visual C++, 32-bit Edition, versions 1.0 and 2.0:

error C2006: #include expected a filename, found 'identifier'
fatal error C1001: INTERNAL COMPILER ERROR
(compiler file 'msc1.cpp', line 602)

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or the following errors when compiling with Microsoft Visual C++, 32-bit Edition, version 4.0,

error C2006: #include expected a filename, found 'identifier'
fatal error C1903: unable to recover from previous error(s); stopping execution

CAUSE

The problem is in using a defined constant to specify an include file in the #include directive. The directive is being processed before the macro is completely expanded, resulting in the error.

MORE INFORMATION

The following sample code can be used to demonstrate the problem.

Sample Code

/* Compile options needed: /Yu"stop.h"
 * Previously created with /Yc"stop.h"
 */

FIRST.H

#define SecondH "Second.H"

SECOND.H

#define SOMETHING

STOP.H

//This file is empty

TEST.CPP

#include "First.H"
#include SecondH
#include "stop.h"