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Date: Tue, 08 Oct 2002 15:46:00 -0000
From: gunneyb@llnl.gov
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Subject: c++/8172: no operator+ for string in library
X-SW-Source: 2002-10/txt/msg00314.txt.bz2
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>Number:         8172
>Category:       c++
>Synopsis:       undefined reference to operator+ for string
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Oct 08 15:46:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Brian T. N. Gunney
>Release:        3.2
>Organization:
Lawrence Livermore National Lab
>Environment:
System: Linux tux75.llnl.gov 2.4.9-31smp #1 SMP Tue Feb 26 06:55:00 EST 2002 i686 unknown
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../gcc-3.2/configure --prefix=/usr/apps/gcc/3.2
>Description:

The operator+ for string is missing when compiled with -fno-implicit-template.
The error occurs at link time as follows:

> /usr/apps/gcc/3.2/bin/g++ -o noplus noplus.o    
noplus.o: In function `main':
noplus.o(.text+0xd8): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> > std::operator+<char, std::char_traits<char>, std::allocator<char> >(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
collect2: ld returned 1 exit status


>How-To-Repeat:
Program text:
#include <string>
#include <iostream>
using namespace std;
int main() {
  string s1 = "first";
  string s2 = "second";
  string s3, s4;

  // This will not link.
  s3 = s1 + s2;

  // This works.
  s4 = s1;
  s4 += s2;

  cout << "s1 = " << s1 << endl;
  cout << "s2 = " << s2 << endl;
  cout << "s3 = " << s3 << endl;
  cout << "s4 = " << s4 << endl;
  return 0;
}

Compile command:
g++ -fno-implicit-templates noplus.cc


>Fix:
Replace s3 = s1 + s2;
With s3 = s1; s3 += s3;
>Release-Note:
>Audit-Trail:
>Unformatted: