[LLVMbugs] [Bug 19303] New: Warnings for Unused Parameters in llvm header files (when function is = delete)

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19303

            Bug ID: 19303
           Summary: Warnings for Unused Parameters in llvm header files
                    (when function is = delete)
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: matsp.llvm at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12317
  --> http://llvm.org/bugs/attachment.cgi?id=12317&action=edit
Much simplified source file to show problem.

When compiling my toy pascal compiler, including the header files from llvm
(d73449481daee33615d907608a3a08548ce2ba65), I get warnings like this:


/usr/local/llvm-debug/include/llvm/Support/MathExtras.h:223:15: error: unused
parameter 'Val'
      [-Werror,-Wunused-parameter]
findLastSet(T Val, ZeroBehavior ZB = ZB_Max) LLVM_DELETED_FUNCTION;
              ^
/usr/local/llvm-debug/include/llvm/Support/MathExtras.h:223:33: error: unused
parameter 'ZB'
      [-Werror,-Wunused-parameter]
findLastSet(T Val, ZeroBehavior ZB = ZB_Max) LLVM_DELETED_FUNCTION;

preprocessed output of the source shows that "LLVM_DELETED_FUNCTION" translates
to = delete:

template <typename T>
typename std::enable_if<std::numeric_limits<T>::is_integer &&
                        std::numeric_limits<T>::is_signed, T>::type
findLastSet(T Val, ZeroBehavior ZB = ZB_Max) = delete;

My compile command looks like this:

clang++ -g -Wall -Werror -Wextra -Wno-unused-private-field -std=c++11
-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I
`/usr/local/llvm-debug/bin/llvm-config --includedir`   -c -o lexer.o lexer.cpp

where lexer.cpp has been simplified to the file attached (one line of
#include...)

(There are multiple errors like this one - I fixed them temporarily by
commenting out the offending variable name, leaving the type declaration in
place, which fixes the warning). 

I'm not convinced whether this is a bug in LLVM or clang++, but I feel that I
should report it somewhere, and expect it can be "moved" to the appropriate
place if necessary.

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