C++ Linker error "undefined reference to `mg_websocket_write'"

[Shane Maloney]

Firstly if this really simple/obvious I apologies in advance. When ever I try to compile the websocket example I get a linker error undefined reference to `mg_websocket_write'. The simple example works fine, I have tried both 4.1 tag and master releases with the same problem. I tried switching the order in the linker command to no avail, new to C++ dev so not even sure if it matters.

Below are my system details and output from make:

System details: Ubuntu 12.04 LTS amd64, g++ (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3, Eclipse C/C++ : 8.1.2.201302132326

make all
Building file: ../src/SimpleHTTPserver.cpp
Invoking: GCC C++ Compiler
g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/SimpleHTTPserver.d" -MT"src/SimpleHTTPserver.d" -o "src/SimpleHTTPserver.o" "../src/SimpleHTTPserver.cpp"
Finished building: ../src/SimpleHTTPserver.cpp
 
Building file: ../src/mongoose.cpp
Invoking: GCC C++ Compiler
g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/mongoose.d" -MT"src/mongoose.d" -o "src/mongoose.o" "../src/mongoose.cpp"
Finished building: ../src/mongoose.cpp
 
Building target: SimpleHTTPServer
Invoking: GCC C++ Linker
g++ -L"/home/shane/MobiPV/workspace/SimpleHTTPServer/src" -o "SimpleHTTPServer"  ./src/SimpleHTTPserver.o ./src/mongoose.o   -ldl -lpthread
./src/SimpleHTTPserver.o: In function `websocket_ready_handler':
/home/shane/MobiPV/workspace/SimpleHTTPServer/Debug/../src/SimpleHTTPserver.cpp:15: undefined reference to `mg_websocket_write'
./src/SimpleHTTPserver.o: In function `websocket_data_handler':
/home/shane/MobiPV/workspace/SimpleHTTPServer/Debug/../src/SimpleHTTPserver.cpp:25: undefined reference to `mg_websocket_write'
collect2: ld returned 1 exit status
make: *** [SimpleHTTPServer] Error 1

[Sergey Lyubka]

Add -DUSE_WEBSOCKET to your compilation flags

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[Shane Maloney]

Thanks, I should have figured that out myself, hangs head in shame.

[Sergey Lyubka]

Actually, my fault, that should be in the documentation.

Will add, thanks for reporting!