[llvm-bugs] [Bug 28901] New: -Wexpansion-to-defined enabled without -pedantic

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28901

            Bug ID: 28901
           Summary: -Wexpansion-to-defined enabled without -pedantic
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: bonzini at gnu.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Macros that expand to "defined" are undefined behavior according to the C
standard, but clang, as a language extension, is implementing it by always
treating "defined" as the preprocessor operator.

While it is a good idea to add a separate warning flag for
-Wexpansion-to-defined, it should only be enabled by default if -pedantic or
perhaps -Wextra (and of course -Weverything) is provided.  It should not be
enabled by -Wall.

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