Linking error with libev3dev.a about ev3dev-lang-cpp

[ddemidov]

What are you using as a linker (echo $LD)?

[agentS]

I am letting arm-linux-gnueabi-g++ select the linker. I have updated the issue and included my makefile. However, I did not set the environment variable $LD.

[ddemidov]

I can not test this right now, but in the meanwhile the following might work:

${PROGNAME}: brickCollector.cpp brickCollector.h ev3dev.cpp ev3dev.h
        $(CC) $(LDFLAGS) $(CFLAGS) brickCollector.cpp ev3dev.cpp

[ddemidov]

I would be most graceful if you could tell me the compiler being used for compiling your library.

I have tested the library with Sourcery codebench crosscompiler (available as sourcery-codebench-arm-none-linux-gnueabi package in Arch linux), and also I think the Using Docker to Cross-Compile worked for me as well.

[agentS]

I fixed it by adding the following two lines to the CMakeLists.txt file:

set (CMAKE_C_COMPILER arm-linux-gnueabi-gcc)
set (CMAKE_CXX_COMPILER arm-linux-gnueabi-g++)

I know it's not the optimal solution, but it works.

[ddemidov]

Ah, so you were building the library with cmake (with normal compiler), and then linking it with cross-compiler. That makes sense now.

I fixed it by adding the following two lines to the CMakeLists.txt file:

You can achieve the same result with the following:

cd ev3dev-lang-cpp/build
rm -rf *
CC=arm-linux-gnueabi-gcc CXX=arm-linux-gnueabi-g++ cmake ..
make

cmake will pick the environment variables and cache those.