[LLVMbugs] [Bug 10184] New: type traits workaround for libstdc++ 4.2 breaks boost

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10184

           Summary: type traits workaround for libstdc++ 4.2 breaks boost
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: richard-llvm at metafoo.co.uk
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


We revert the following keywords to normal identifiers when libstdc++ 4.2's
type traits header is included:

__is_arithmetic
__is_convertible
__is_empty
__is_floating_point
__is_function
__is_fundamental
__is_integral
__is_member_function_pointer
__is_member_pointer
__is_pod
__is_pointer
__is_same
__is_scalar
__is_signed
__is_unsigned
__is_void

Consequently, these type traits are unavailable to code which wants to use both
libstdc++ 4.2 and these traits (such as boost). Perhaps we should add another
set of builtins of the form __builtin_is_foo which don't evaporate in the
presence of libstdc++.

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