[LLVMbugs] [Bug 22902] New: clang 3.7 requires a definition of an unused variable if -g option is specified

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=22902

            Bug ID: 22902
           Summary: clang 3.7 requires a definition of an unused variable
                    if -g option is specified
           Product: clang
           Version: trunk
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: kariya_mitsuru at hotmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 14044
  --> https://llvm.org/bugs/attachment.cgi?id=14044&action=edit
clang++ -v

The sample code below is compiled and linked successfully if -g option is not
specified but it causes a linkage error if -g option is specified.

================ sample code ================
extern char dummy;

template<char&>
void f() {}

int main()
{
    f<dummy>();
}
================ sample code ================
with -g option: http://melpon.org/wandbox/permlink/Bt83IkZr8Mu1bW9s
w/o  -g option: http://melpon.org/wandbox/permlink/0Rgoup5odwqIrDju

Note that clang 3.3 compiles and links it successfully even though -g option is
specified.

cf. http://melpon.org/wandbox/permlink/iXtqIsBEkDBOXhpL

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