http://llvm.org/bugs/show_bug.cgi?id=3943
Summary: Defining/undefining builtin macros
Product: clang
Version: unspecified
Platform: PC
OS/Version: NetBSD
Status: NEW
Severity: normal
Priority: P2
Component: preprocessor
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
The standard forbids this, but it is not a constraint. Clang diagnoses some
but not others, e.g.
#undef __LINE__ // diagnosed
#undef __STDC_HOSTED__ // undiagnosed
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