[llvm-bugs] [Bug 45731] New: __builtin_FUNCTION() inconsistent on path separator on Windows

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45731

            Bug ID: 45731
           Summary: __builtin_FUNCTION() inconsistent on path separator on
                    Windows
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: xandan at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Given the following

src/main.cpp
src/header.h

And the following code:

//header.h
#include <iostream>

void test()
{
    std::cout << __builtin_FILE() << '\n';
}

=====

//main.cpp
#include "header.h"

int main()
{
    test();
    std::cout << __builtin_FILE() << '\n';
}

======

I get the following output

src/header.h
src\main.cpp

Discovered this when implementing srd::source_location for Microsoft here

https://github.com/microsoft/STL/pull/664#issuecomment-621063583

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