PHNT #if directives causes "token is not a valid binary operator in a preprocessor subexpression"

[dongle-the-gadget]

PHNT includes some #if directives that look like below, and that causes ClangSharpPInvokeGenerator to output "token is not a valid binary operator in a preprocessor subexpression":

#define PHNT_MODE_KERNEL 0

#ifndef PHNT_MODE
#define PHNT_MODE 1
#endif

#if (PHNT_MODE != PHNT_MODE_KERNEL)
// Some real code here
#endif

[tannergooding]

Can you provide some more details about the options you're passing into ClangSharp, the version you're using, and possibly a minimal repro?

ClangSharp simply passes the files down to Clang. So if Clang is reporting an error then it's likely caused by some other mismatch.

[dongle-the-gadget]

I'm using ClangSharpPInvokeGenerator version 18.1.0.1.

RSP file:

--file
test.h
--output
Test
--namespace
Test
--define-macro
PHNT_MODE PHNT_MODE_KERNEL

As for the test.h file, the code in the original comment should work as-is to reproduce the error.

[tannergooding]

You've defined PHNT_MODE with no value, so it compiles down to #if ( != 0)

You need to either not do --define-macro because it's automatically included in the file, or explicitly give it a value such as PHNT_MODE=1

[tannergooding]

You can reproduce this in isolation on godbolt using something like:

#define PHNT_MODE
#define PHNT_MODE_KERNEL

#define PHNT_MODE_KERNEL 0

#ifndef PHNT_MODE
#define PHNT_MODE 1
#endif

#if (PHNT_MODE != PHNT_MODE_KERNEL)
// Some real code here
#endif