[LLVMbugs] [Bug 10233] New: extern keyword for inline definition should trigger function emission

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10233

           Summary: extern keyword for inline definition should trigger
                    function emission
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nlewycky at google.com
                CC: llvmbugs at cs.uiuc.edu


This file:

  inline double ms2kph(double ms)
  {
    return (ms * 3.6);
  }
  extern double ms2kph(double ms);

when compiled in C99 mode should produce a definition of ms2kph, but it does
not. GCC gets this right:

nlewycky at ducttape:~$ gcc -std=c99 z.c -c -o z.o
nlewycky at ducttape:~$ nm z.o
0000000000000000 T ms2kph
nlewycky at ducttape:~$ clang -std=c99 z.c -c -o z.o
nlewycky at ducttape:~$ nm z.o
nlewycky at ducttape:~$ 

The relevant rule in C99 6.7.4/6 is "If all of the file scope declarations for
a function in a translation unit include the inline function specifier without
extern, then the definition in that translation unit is an inline definition.
An inline definition does not provide an external definition ...".

The example in para 7/8 makes the intended behaviour much more clear.

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