Bug ID: 41202
           Summary: float.h not working on mingw
           Product: clang
           Version: 8.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++

After compiling clang 8 using mingw gcc 8.1 I wanted to compile one of my
projects but it failed to compile as there is an error when including the file
float.h. Tried the same with Clang 7 and Clang 7.0.1 and did not have any

Turns out the problem is something with the preprocessor:
#if (__GNUC__ < 4  || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)) \
    || (__clang_major__ >=3)
#if !defined(_FLOAT_H___) && !defined(__FLOAT_H)
#include_next <float.h>

Clang 7 and 7.0.1 for some reason do not enable the region which has
#include_next yet clang 8 does and fails as it does not fit a next float.h

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