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<concept id="GUID-5B3F5296-D6D0-5D25-8362-141DF5927E52" xml:lang="en"><title>Troubleshooting</title><prolog><metadata><keywords/></metadata></prolog><conbody>
<p>This topic describes how to troubleshoot issues that you may face while
writing or building Std C++ code on the Symbian platform. </p>
<section id="GUID-04238416-930E-4286-9610-F39C34A52CBD"><title>Errors while building Std C++ Code </title> <p> <b>Problem</b>  </p> <p>You
may get a build error when you create a static library as illustrated in the
following code and link it with an <codeph>STDEXE</codeph>. </p> <p>The <filepath>.mmp</filepath> file
of the static library: </p> <codeblock id="GUID-24E1CFD7-2B90-5608-A0B4-49A0D4730B22" xml:space="preserve">//operator_new_failure_example_lib.mmp
Target             operator_new_failure_example_lib.lib
Targettype        lib
Source            op_new_in_lib.cpp
Systeminclude        /epoc32/include/stdapis/stlportv5
Systeminclude        /epoc32/include/stdapis</codeblock> <p>The <filepath>.cpp</filepath> file
of <codeph>operator new</codeph> reference in the static library example: </p> <codeblock id="GUID-53202569-286A-5E39-9530-6077E2E1F740" xml:space="preserve">// op_new_in_lib.cpp contents
#include &lt;new&gt;
int doSomething()
    {
    try
        {
        int *ptr = new int(0); // This refers the StdC++ operator new
        //do something more…
        }
        catch (std::bad_alloc)
        {
        return 1;
        }
    delete ptr;
    return 0;
    }</codeblock> <p>The <filepath>.mmp</filepath> file of the <codeph>STDEXE</codeph> that
links with the static library: </p> <codeblock id="GUID-7A60B16A-3AD8-50B2-8F17-84338291A4E8" xml:space="preserve">//operator_new_failure_example.mmp
Target             operator_new_failure_example.exe
Targettype        stdexe
Source            op_new_in_stdexe.cpp
Systeminclude        /epoc32/include/stdapis/stlportv5
Systeminclude        /epoc32/include/stdapis
Library            libstdcppv5.lib libc.lib
Staticlibrary        operator_new_failure_example_lib.lib
Capability        all -tcb</codeblock> <p>The <filepath>.cpp</filepath> file
of <codeph>operator new</codeph> reference in static library example: </p> <codeblock id="GUID-53419423-2116-5B6C-A3A7-6AFBD039321C" xml:space="preserve">// op_new_in_stdexe.cpp contents looks as follows:
int main()
    {
    // the doSomething function is defined in the static library operator_new_failure_example_lib.lib that this exe is linking against.
    return doSomething();
    }</codeblock> <p> <b>Solution</b>  </p> <p>The build error is caused because
this code violates rule 5 under the <xref href="GUID-C9D4D586-58BF-5676-A53F-9C3A51101430.dita">Guidelines
for Writing Standard C++ Libraries</xref> section. As per the rule, a static
library of target type <codeph>LIB</codeph> cannot be linked against an <codeph>STDEXE</codeph> or <codeph>STDDLL</codeph>,
unless it has the <codeph>MMP</codeph> keyword, STDCPP in its <filepath>.mmp</filepath> file. </p> <p>You
can fix the build error by adding <codeph>STDCPP</codeph> in the <filepath>operator_new_failure_example_lib.mmp</filepath> file
as shown in the following code: </p> <codeblock id="GUID-8EA4BD46-ADBC-5243-9B3A-14BCA2767424" xml:space="preserve">//operator_new_failure_example_lib.mmp
Target             operator_new_failure_example_lib.lib
Targettype        lib
//The STDCPP keyword specifies Standard C++ 
STDCPP
Source            op_new_in_lib.cpp
Systeminclude        /epoc32/include/stdapis/stlportv5
Systeminclude        /epoc32/include/stdapis</codeblock> </section>
</conbody><related-links>
<link href="GUID-D6BEAF0D-844D-51F4-8DB7-FB1D60E17FE3.dita"><linktext>Copyright
Acknowledgments for Standard C++                 (STLport)</linktext></link>
<link href="GUID-F7FEB759-E64D-5B6D-9017-C5E982E4FC16.dita"><linktext>Standard
C++ Library Overview</linktext></link>
<link href="GUID-2CCD1748-9EDE-5383-9941-A3051E06F3E2.dita"><linktext>Standard
C++ Support on the Symbian Platform</linktext></link>
<link href="GUID-CDE8CD85-8467-5B36-A0AC-41D1D98151CA.dita"><linktext> Developing
Applications or Libraries                 Using Standard C++</linktext></link>
<link href="GUID-E331B72B-84AF-558A-9B8F-73E5E50B58C7.dita"><linktext>Building
a Standard C++ Application or                 Library</linktext></link>
<link href="GUID-D32E52C9-F05C-5F1E-8B49-243D555C353C.dita"><linktext>Known Issues</linktext>
</link>
</related-links></concept>