AM v7.6: configure failure - undefined reference to `pthread_create'

Build Error

Building the Genivi 13 Yocto Baseline with AM v7.6 results in the following build error in the do_configure task:

CMakeFiles/cmTC_88181.dir/CheckSymbolExists.c.o: In function `main':
/usr/src/debug/audiomanager/7.6-r0/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8: undefined reference to `pthread_create'
/usr/src/debug/audiomanager/7.6-r0/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:8: undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status

The related configure output is:

– Looking for pthread.h
– Looking for pthread.h - found
– Looking for pthread_create
– Looking for pthread_create - not found
– Looking for pthread_create in pthreads
– Looking for pthread_create in pthreads - not found
– Looking for pthread_create in pthread
– Looking for pthread_create in pthread - found
– Found Threads: TRUE

The build tree from the failed yocto build is attached.

Status

This issue is a blocker for the integration of AM 7.6 into the Yocto Baseline.

Initial investigation

I can resolve this issue by adding pthreads to the CFLAGS in the AM Yocto recipe like this:

OECMAKE_C_FLAGS += "-pthread"

That feels like a workaround only though so I would like input from the component maintainers. Wouldn't you expect the component makefile to set the required flags?