🚀 go-pugleaf

Gnu g++ v2.3.2 for Sparc-Sun-SunOS 4.1.1

Friend function A is defined inside the class.  Member function B is
also  defined inside the class definition and uses function A.  When B
is used the invocation of A is not expanded inline; neither is a body
generated for A.  I believe it fails equally if A is a member function,
and if A is a user-named function (not overloaded operator).
 

James F. Carter        (213) 825-2897
UCLA-Mathnet;  6221 MSA; 405 Hilgard Ave.; Los Angeles, CA, USA  90024-1555
Internet: jimc@math.ucla.edu            BITNET: jimc%math.ucla.edu@INTERBIT
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---------- Linker output

ld: Undefined symbol 
   ___ls__FR7ostreamRC5zilch 
collect: /usr/bin/ld returned 2 exit status

---------- Source code: main program

/* bug16a.c -- Nested inline function not expanded inline ("C" main program)
	Compile by:
	gcc -c bug16a.c
	Then compile and link bug16b.C (q.v.)
*/

void interface(const char* s);

int main() {
/*    interface("this is the string\n"); */
    interface__FPCc("this is the string\n");
    return 0;
}

------------ Source code (C++ subroutine)

/* bug16b.C -- Nested inline function not expanded inline

    To demonstrate:
	gcc -c bug16a.c
	g++ -c bug16b.C
	g++ bug16a.o bug16b.o
    Linker (collect2) complains that it can't find ___ls__FR7ostreamRC5zilch
		(operator << (ostream&, const zilch&) )
 */

#include <iostream.h>

class zilch {
  public:
    const char* content;
    zilch(const char* s) : content(s) { }
    friend ostream& operator << (ostream& f, const zilch& z)
	{ return f << z.content; }
    void print(ostream& f)
	{ f << *this; }		//Should expand op<< inline, but doesn't.
};

// Everything works if op << is out of line.
//ostream& operator << (ostream& f, const zilch& z)
//	{ return f << z.content; }

// Originally attributed to "extern C" and calling from "C" main program,
// but that turned out to be irrelevant.
/*extern "C"*/ void interface(const char* s) {
    zilch z(s);
    z.print(cout);
}