[LLVMbugs] [Bug 4133] New: clang: symbol declared as always_inline and extern considered internal

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4133

           Summary: clang: symbol declared as always_inline and extern
                    considered internal
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: edwintorok at gmail.com
                CC: llvmbugs at cs.uiuc.edu
            Blocks: 4068


The kernel fails to link:
net/unix/af_unix.c:(.text+0x6d779): undefined reference to `mutex_lock'
net/built-in.o: In function `unix_dgram_recvmsg':
net/unix/af_unix.c:(.text+0x6e9af): undefined reference to `mutex_lock'
net/built-in.o: In function `unix_autobind':
net/unix/af_unix.c:(.text+0x6f30f): undefined reference to `mutex_lock'
net/built-in.o: In function `unix_stream_recvmsg':
net/unix/af_unix.c:(.text+0x70531): undefined reference to `mutex_lock'
net/unix/af_unix.c:(.text+0x70966): undefined reference to `mutex_lock


Testcase:
$ gcc -c testcase-min.i -o x.o
0000000000000000 T mutex_lock
$ clang testcase-min.i -c -o x.o
$ nm x.o
$ clang testcase-min.i -c -o x.o -std=gnu89
$ nm x.o
$ cat testcase-min.i
void inline __attribute__ ((always_inline))
  __attribute__ ((__section__ (".sched.text"))) mutex_lock (struct mutex
                                                            *lock)
{
}

extern
typeof (mutex_lock)
  mutex_lock;


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