CMake not able to find pthread lib on migrating to Yocto 2.2 (Morty)

[tdeva14]

We are currently migrating to Yocto v2.2(Morty) in RDKB devices which runs gcc6 and we are seeing the below configuration error.

| -- 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 - not found
| -- Check if compiler accepts -pthread
| -- Check if compiler accepts -pthread - no
| CMake Error at /mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/sysroots/x86_64-linux/usr/share/cmake-3.8/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
| Could NOT find Threads (missing: Threads_FOUND)

Attached
CMakeError.log
CMakeOutput.log

[kraj]

here are interesting bits

/mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/sysroots/x86_64-linux/usr/bin/arm-rdk-linux-gnueabi/arm-rdk-linux-gnueabi-gcc  -march=armv7ve -mfpu=neon  -mfloat-abi=hard -mcpu=cortex-a15 -fno-omit-frame-pointer -fno-optimize-sibling-calls  --sysroot=/mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/sysroots/tchxb6  -pipe -g -feliminate-unused-debug-types -fdebug-prefix-map=/mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/work/cortexa15hf-neon-rdk-linux-gnueabi/parodus2ccsp/git+AUTOINC+e602349bc2-r0=/usr/src/debug/parodus2ccsp/git+AUTOINC+e602349bc2-r0 -fdebug-prefix-map=/mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/sysroots/x86_64-linux= -fdebug-prefix-map=/mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/sysroots/tchxb6= -Os -pipe -DFEATURE_SUPPORT_RDKLOG -I/mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/sysroots/x86_64-linux/usr/include/breakpad   -march=armv7ve -mfpu=neon  -mfloat-abi=hard -mcpu=cortex-a15 -fno-omit-frame-pointer -fno-optimize-sibling-calls  --sysroot=/mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/sysroots/tchxb6  -D_COSA_HAL_ -U_COSA_SIM_ -fno-exceptions -ffunction-sections -fdata-sections -fomit-frame-pointer -fno-strict-aliasing            -DCONFIG_SYSTEM_MOCA -D_ANSC_LINUX -D_ANSC_USER -D_ANSC_LITTLE_ENDIAN_ -D_CCSP_CWMP_TCP_CONNREQ_HANDLER            -D_DSLH_STUN_ -D_NO_PKI_KB5_SUPPORT -D_BBHM_SSE_FILE_IO -D_ANSC_USE_OPENSSL_ -DENABLE_SA_KEY            -D_ANSC_AES_USED_ -D_COSA_INTEL_USG_ARM_ -D_COSA_FOR_COMCAST_ -D_NO_EXECINFO_H_ -DFEATURE_SUPPORT_SYSLOG            -DBUILD_WEB -D_NO_ANSC_ZLIB_ -D_DEBUG -U_ANSC_IPV6_COMPATIBLE_ -DINCLUDE_BREAKPAD -DUSE_NOTIFY_COMPONENT -DNTPD_ENABLE 	   -DUTC_ENABLE -DXDNS_ENABLE 	    -D_XB6_PRODUCT_REQ_ -D_COSA_BCM_ARM_ -D_ENABLE_BAND_STEERING_ -DMOCA_DIAGONISTIC     -DFEATURE_SUPPORT_MESH 	-D_YOCTO_ 	-DPLATFORM_RDKB 	-DRDKB_BUILD 	-I/mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/sysroots/tchxb6/usr/include/ccsp 	-I/mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/sysroots/tchxb6/usr/include/wdmp-c 	-I/mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/sysroots/tchxb6/usr/include/libparodus 	-I/mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/sysroots/tchxb6/usr/include/dbus-1.0 	-I/mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/sysroots/tchxb6/usr/lib/dbus-1.0/include 	-I/mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/sysroots/tchxb6/usr/include/cimplog 	 -D_GNU_SOURCE    -march=armv7ve -mfpu=neon  -mfloat-abi=hard -mcpu=cortex-a15 -fno-omit-frame-pointer -fno-optimize-sibling-calls  --sysroot=/mnt/home/dthiya418/Yocto-2.2/txb6morty/tchxb6-morty/tmp/sysroots/tchxb6  -Wl,-O1 -Wl,--hash-style=gnu  -lrdkloggers -lcjson -lmsgpackc -ltrower-base64 -lnanomsg -lcimplog -lwdmp-c -lwrp-c -llibparodus -lm -lpthread -luuid -lstdc++ -lbreakpadwrapper -lsysevent -lutapi -lutctx -lsyscfg -Wl,-O1 -Wl,--hash-style=gnu  -lrdkloggers -lcjson -lmsgpackc -ltrower-base64 -lnanomsg -lcimplog -lwdmp-c -lwrp-c -llibparodus -lm -lpthread -luuid -lstdc++ -lbreakpadwrapper -lsysevent -lutapi -lutctx -lsyscfg  CMakeFiles/cmTC_8d056.dir/CheckSymbolExists.c.o  -o cmTC_8d056 
/usr/src/debug/parodus2ccsp/git+AUTOINC+e602349bc2-r0/build/CMakeFiles/CMakeTmp/CheckSymbolExists.c:13: error: undefined reference to 'pthread_create'
collect2: error: ld returned 1 exit status
make[1]: *** [cmTC_8d056] Error 1

What this means is that -lpthread is being added to compiler/linker cmdline but its appears before the .o file which needs the functions from it. so please try to find out how this sequence could be altered such that all LDFLAGS are appended after the .o files on cmdline.