`#pragma once` does not work if files referenced by alternate paths

[mmastrac]

Repro attached.

test.c:

#include "base.h"
#include "x/inc.h"

base.h:

#pragma once
struct foo {
        int bar;
};

x/inc.h

#pragma once
#include "../base.h"

Using 2021-05-01 build.

Expected result: successful compile (works in gcc/llvm)
Actual result: /home/x/../base.h(3): Error! E1019: Tag 'foo' already defined
Workaround: #ifdef guards

repro.zip

[jmalak]

Thanks for bug report.
I confirm this bug in both C and C++ compilers.

[jmalak]

It is standard OW behaviour for any version to use specified name(in source file) instead of OS fullpath.
I will change behaviour to use OS fullpath for comparision then it should work as expected.
The problem is common for similar pragmas which works with path or file name that they must be fixed too.

[jmalak]

Now it should be fixed in git repository.