[LLVMbugs] [Bug 7955] New: Clang's stddef.h, wint_t and MinGW headers

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7955

           Summary: Clang's stddef.h, wint_t and MinGW headers
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P
         Component: Headers
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: salvois at users.sourceforge.net
                CC: llvmbugs at cs.uiuc.edu


Greetings,
in order to function properly with other MinGW headers, it should be possible
to include Clang's stddef.h more than once bypassing the __STDDEF_H include
guard.

For example stdio.h includes stddef.h with __need_wint_t to define wint_t, and
it may fail if stddef.h has been included before without __need_wint_t defined.

I've solved this issue by moving the whole block defining wint_t outside the
__STDDEF_H include guard. It should not have any side effects.

BTW, the comment "Some C libraries expect to see a wint_t here. Others (notably
MinGW) will use __WINT_TYPE__ directly" is misleading: at least the current
MinGW *does* expect wint_t in stddef.h.

Thanks,
Salvo

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