added full crosstool-ng instructions

cmake/BBBCrossCompileConfig.cmake

@@ -33,6 +33,15 @@ else()
 	)
 endif()
 
+# Generally, the debian roots will be a multiarch rootfs where some libraries are put
+# into a folder named "arm-linux-gnueabihf". The user can override the folder name if this is
+# not the case
+if(NOT ENV{MULTIARCH_FOLDER_NAME})
+    set(MULTIARCH_FOLDER_NAME "arm-linux-gnueabihf")
+else()
+    set(MUTLIARCH_FOLDER_NAME $ENV{MULTIARCH_FOLDER_NAME})
+endif()
+
 message(STATUS "Using sysroot path: ${SYSROOT_PATH}")
 
 set(CROSS_COMPILE_CC "${CROSS_COMPILE}-gcc")
@@ -62,9 +71,9 @@ set(CMAKE_SYSTEM_PROCESSOR "arm")
 # List of library dirs where LD has to look. Pass them directly through gcc. 
 # LD_LIBRARY_PATH is not evaluated by arm-*-ld
 set(LIB_DIRS 
-	"${SYSROOT_PATH}/lib/${CROSS_COMPILE}"
+	"${SYSROOT_PATH}/lib/${MUTLIARCH_FOLDER_NAME}"
 	"${SYSROOT_PATH}/usr/local/lib"
-	"${SYSROOT_PATH}/usr/lib/${CROSS_COMPILE}"
+	"${SYSROOT_PATH}/usr/lib/${MUTLIARCH_FOLDER_NAME}"
 	"${SYSROOT_PATH}/usr/lib"
 )
 # You can additionally check the linker paths if you add the 
@@ -74,11 +83,6 @@ foreach(LIB ${LIB_DIRS})
 	set(COMMON_FLAGS "${COMMON_FLAGS} -L${LIB} -Wl,-rpath-link,${LIB}")
 endforeach()
 
-set(CMAKE_PREFIX_PATH 
-	"${CMAKE_PREFIX_PATH}"
-	"${SYSROOT_PATH}/usr/lib/${CROSS_COMPILE}"
-)
-
 set(CMAKE_C_FLAGS 
 	"-march=armv7-a -mtune=cortex-a8 -mfpu=neon -mfloat-abi=hard ${COMMON_FLAGS}" 
 	CACHE STRING "Flags for Beagle Bone Black"