[llvm-bugs] [Bug 41202] New: float.h not working on mingw

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https://bugs.llvm.org/show_bug.cgi?id=41202

            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++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: markus.boeck02 at gmail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

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
problems.

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>
#endif

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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