Gcc vs. Visual C++ compiler for Matlab

[garyhuang]

Hi,

I have compiled my cpp code in my matlab sucessfully using "mex" command. The compiler I used in "mex" is Visual C++ 8.0 compiler.
However, when I try to use gcc compiler instead for compile this file for matlab use in Linux environment, the compilation is not successful.
The error message I got is the following. Any hints or explanation would be appreciated. Thank you in advance.

gary


>> mex ldpc_encoder_pr epros_c.cpp
ldpc_encoder_pr epros_c.o: In function `CLDPCEncoderPr eProc::UrbankeC H(int)':
ldpc_encoder_pr epros_c.cpp:(.t ext+0x37d): undefined reference to `CLDPCEncoderPr eProc::ColUnkow n'
ldpc_encoder_pr epros_c.o: In function `CLDPCEncoderPr eProc::CLDPCEnc oderPreProc(uns igned int, unsigned int, unsigned int, unsigned int, double const*, int const*, int const*, double const*)':
ldpc_encoder_pr epros_c.cpp:(.t ext+0xb14): undefined reference to `CLDPCEncoderPr eProc::ColUnkow n'
ldpc_encoder_pr epros_c.o: In function `CLDPCEncoderPr eProc::UrbankeA H(int)':
ldpc_encoder_pr epros_c.cpp:(.t ext+0xf93): undefined reference to `CLDPCEncoderPr eProc::ColUnkow n'
ldpc_encoder_pr epros_c.o: In function `CLDPCEncoderPr eProc::UrbankeC HT(int)':
ldpc_encoder_pr epros_c.cpp:(.t ext+0x162e): undefined reference to `CLDPCEncoderPr eProc::ColUnkow n'
ldpc_encoder_pr epros_c.o: In function `CLDPCEncoderPr eProc::CLDPCEnc oderPreProc(uns igned int, unsigned int, unsigned int, unsigned int, double const*, int const*, int const*, double const*)':
ldpc_encoder_pr epros_c.cpp:(.t ext+0x2404): undefined reference to `CLDPCEncoderPr eProc::ColUnkow n'
collect2: ld returned 1 exit status

[weaknessforcats]

Undefined references occur in two places.

First, during the compile when you use something that has not been declared. If this is your situation , check that all header files have been included.

Second, things compile OK but die in the link due to unresolved references. Here you need to be sure that all sources files were part of the build and that all libraries were correctly added to the build.