CODEWITHSUNDEEP
androidc++cmakeandroid-ndk
D-rk
D-rk

Reputation: 5919

NDK linking library with cmake

I have a c++ library which does opengl (es 2.0) rendering and I want to use it on android. When linking the library with target_link_libraries(mylib log GLESv2) I receive the following error:

ld: error: cannot open crtbegin_so.o: No such file or directory
ld: error: cannot open crtend_so.o: No such file or directory
ld: error: cannot find -llog
ld: error: cannot find -lGLESv2
ld: error: cannot find -lm
ld: error: cannot find -lstdc++
ld: error: cannot find -lm
ld: error: cannot find -ldl
ld: error: cannot find -lc
ld: error: cannot find -ldl

If I provide a specific directory from android ndk manually it works. In cmake this looks similar to this:

link_directories( ${ANDROID_NDK}/platforms/${ANDROID_API}/arch-${ANDROID_ABI}/usr/lib )

I'm wondering if this is the correct way to solve the error. In this simple example the additional definition of link_directories is not needed. What is the difference to my library?

Upvotes: 0

Views: 721

Answers (1)

D-rk
D-rk

Reputation: 5919

The cause for this was quite simple. I was overwriting the compiler flags in my cmake files:

SET(CMAKE_CXX_FLAGS "-foo" )

when I changed this to

SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -foo" )

the linking problems are gone.

Upvotes: 2

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