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List:       cfe-dev
Subject:    [cfe-dev] Clang compile error
From:       Robert Ankeney <rrankene () gmail ! com>
Date:       2013-08-09 12:42:00
Message-ID: CAJL6GZoqk_B+63HSHJuWcAe-AYxSyo2BZHE-ruD3zPkvEvkK3w () mail ! gmail ! com
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I was trying to use clang to compile some Qt 5.1.0 code and came across a
compile error when including the file QtCore/qabstractitemmodel.h.

Simplyfying the code, I created bar.cpp:

class bar
{
  friend int foo(int seed = 0);
};

inline int foo(int seed) { return seed; }

int main()
{
  bar bletch;
}

The error I get using clang version 3.4 (trunk 187329) is:

bar.cpp:3:14: error: friend declaration specifying a default argument must
be a definition
  friend int foo(int seed = 0);
             ^
bar.cpp:6:12: error: friend declaration specifying a default argument must
be the only declaration
inline int foo(int seed) { return seed; }
           ^
bar.cpp:3:14: note: previous declaration is here
  friend int foo(int seed = 0);
             ^
2 errors generated.

Moving the initializer "seed = 0" from the friend declaration to the inline
declaration compiles without problem.

This code compiles fine with clang 3.3 and gcc 4.7.3.

Robert Ankeney

[Attachment #5 (text/html)]

I was trying to use clang to compile some Qt 5.1.0 code and came across a compile \
error when including the file QtCore/qabstractitemmodel.h.<br><br>Simplyfying the \
code, I created bar.cpp:<br><br>class bar<br>{<br>  friend int foo(int seed = 0);<br> \
};<br><br>inline int foo(int seed) { return seed; }<br><br>int main()<br>{<br>  bar \
bletch;<br>}<br><br>The error I get using clang version 3.4 (trunk 187329) \
is:<br><br>bar.cpp:3:14: error: friend declaration specifying a default argument must \
be a definition<br>  friend int foo(int seed = 0);<br>             ^<br>bar.cpp:6:12: \
error: friend declaration specifying a default argument must be the only \
declaration<br>inline int foo(int seed) { return seed; }<br>           \
^<br>bar.cpp:3:14: note: previous declaration is here<br>  friend int foo(int seed = \
0);<br>             ^<br>2 errors generated.<br><br>Moving the initializer &quot;seed \
= 0&quot; from the friend declaration to the inline declaration compiles without \
problem.<br><br>This code compiles fine with clang 3.3 and gcc 4.7.3.<br> <br>Robert \
Ankeney<br><br>



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