[LLVMbugs] [Bug 6919] New: clang++: inline friend operator< symbol emitted as non-inline causing linker errors

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6919

           Summary: clang++: inline friend operator< symbol emitted as
                    non-inline causing linker errors
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: edwintorok at gmail.com
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com
            Blocks: 6916


Blender gives these linker errors:
../../lib/libbf_elbeem.a(elbeem.o): In function `operator<(ntlTriangle const&,
ntlTriangle const&)':
/home/edwin/clangtests/blender-2.49b/intern/elbeem/intern/elbeem.cpp:(.text+0x50):
multiple definition of `operator<(ntlTriangle const&, ntlTriangle const&)'
../../lib/libbf_elbeem.a(utilities.o):/home/edwin/clangtests/blender-2.49b/intern/elbeem/intern/utilities.cpp:(.text+0x2d50):
first defined here


$ cat >testcase.h <<EOF
class ntlTriangle
{
public:
    inline friend bool operator<(const ntlTriangle &lhs, const ntlTriangle
&rhs);

};

bool operator<(const ntlTriangle &lhs,const ntlTriangle &rhs)
{
    return true;
}
EOF

This header is included in 2 cpp files, so:
$ cp testcase.h t1.cpp
$ cp testcase.h t2.cpp
$ clang++ t1.cpp t2.cpp
/tmp/cc-BjvUfe.o: In function `operator<(ntlTriangle const&, ntlTriangle
const&)':
t2.cpp:(.text+0x0): multiple definition of `operator<(ntlTriangle const&,
ntlTriangle const&)'
/tmp/cc-c6oItc.o:t1.cpp:(.text+0x0): first defined here

GCC accepts this code and causes no linker errors.
As a workaround, if I add 'inline' to the definition then clang gets it right
too.

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