Bool std::operator== char,std::char_traits........ undefined symbol error

Question

Hi
I saw some issues related with this error in forum but this error is a little bit different from others I think. when I compile my code in OPTIMIZE (release) mode, there is nothing wrong. it can be compiled. but when i try to compile in debug mode (compiling with -g flag) compilation throws
Undefined first referenced
symbol in file
bool std::operator==<char,std::char_traits<char>,std::allocator<char> >(const std::basic_string<__type_0,__type_1,__type_2>&,const __type_0*) /dev/aykut/src/aaa.o
bool std::operator==<char,std::char_traits<char>,std::allocator<char> >(const __type_0*,const std::basic_string<__type_0,__type_1,__type_2>&) /dev/aykut/src/bbb.o
errors. I compiled with stlport4 library but in this time, some definitions cant be found like
Error: The function "strlen" must have a prototype.
Error: The function "strcasecmp" must have a prototype.
libCstd has ignored I think.
what is the reason of these errors ?
System info :
CC -V
CC: Sun C++ 5.8 Patch 121017-19 2009/03/12
uname -a
SunOS hitit 5.8 Generic_108528-03 sun4u sparc SUNW,Ultra-250

Answer 1

The missing symbols are due to an out-of-date /usr/lib/libCstd.so.1. Please get the current C++ runtime library patch for your version of Solaris and install it. You can get all patches here:
[http://developers.sun.com/sunstudio/downloads/patches/index.jsp]
The reason you see the problem only when compiling for debug is that compiling with -g disables function inlining, and the compiler needs to find more functions in the system library. An out-of-date library is often missing needed functions. If you compile with -g0 (g zero) instead, function inlining will occur as usual. Programs run faster when functions are inlined, and you have less dependence on the system libraries, but you can't debug a function if it has been inlined.
You don't see that particular problem with STLport because libstlport comes with the compiler, not as part of Solaris.
The reason you have problems with missing declarations when using STLport is because your code has failed to include standard headers that provide those declarations.
The C++ standard allows, but does not require, any of the C++ standard headers to include other standard headers. Implementations vary in what other headers, if any, a given standard header includes.
The rule is that if you use a standard library facility, you must explicitly include the associated header. For example, if you use strlen, you must explicitly include <string.h> or <cstring>. By accident, one of the C++ headers you include might include that header for you, but you can't depend on it.