Introduce cmake-based rewrite of KBuild

Introducing CMake is an important step in a larger effort to make
Zephyr easy to use for application developers working on different
platforms with different development environment needs.

Simplified, this change retains Kconfig as-is, and replaces all
Makefiles with CMakeLists.txt. The DSL-like Make language that KBuild
offers is replaced by a set of CMake extentions. These extentions have
either provided simple one-to-one translations of KBuild features or
introduced new concepts that replace KBuild concepts.

This is a breaking change for existing test infrastructure and build
scripts that are maintained out-of-tree. But for FW itself, no porting
should be necessary.

For users that just want to continue their work with minimal
disruption the following should suffice:

Install CMake 3.8.2+

Port any out-of-tree Makefiles to CMake.

Learn the absolute minimum about the new command line interface:

$ cd samples/hello_world
$ mkdir build && cd build
$ cmake -DBOARD=nrf52_pca10040 ..

$ cd build
$ make

PR: zephyrproject-rtos#4692
docs: http://docs.zephyrproject.org/getting_started/getting_started.html

Signed-off-by: Sebastian Boe <sebastian.boe@nordicsemi.no>

CMakeLists.txt

@@ -0,0 +1 @@
+add_subdirectory(simplelink)

simplelink/CMakeLists.txt

@@ -0,0 +1,67 @@
+add_subdirectory(source/ti/devices)
+
+if(CONFIG_SIMPLELINK_HOST_DRIVER)
+  zephyr_include_directories(
+    source
+    kernel/zephyr/dpl
+    )
+  zephyr_compile_definitions(
+    SL_SUPPORT_IPV6
+    SL_PLATFORM_MULTI_THREADED
+    )
+endif()
+
+if(CONFIG_HAS_CC3220SDK)
+  if(CONFIG_SIMPLELINK_HOST_DRIVER)
+    zephyr_library()
+    zephyr_library_compile_definitions(${COMPILER})
+    zephyr_library_sources(
+      source/ti/drivers/SPI.c
+      source/ti/drivers/spi/SPICC32XXDMA.c
+      source/ti/drivers/dma/UDMACC32XX.c
+      source/ti/drivers/power/PowerCC32XX.c
+      source/ti/drivers/utils/List.c
+      source/ti/drivers/net/wifi/source/device.c
+      source/ti/drivers/net/wifi/source/flowcont.c
+      source/ti/drivers/net/wifi/source/fs.c
+      source/ti/drivers/net/wifi/source/netapp.c
+      source/ti/drivers/net/wifi/source/netcfg.c
+      source/ti/drivers/net/wifi/source/netutil.c
+      source/ti/drivers/net/wifi/source/nonos.c
+      source/ti/drivers/net/wifi/source/spawn.c
+      source/ti/drivers/net/wifi/source/wlan.c
+      source/ti/drivers/net/wifi/porting/CC3220SF_LAUNCHXL.c
+      source/ti/drivers/net/wifi/porting/cc_pal.c
+      source/ti/drivers/net/wifi/eventreg.c
+      source/ti/drivers/net/wifi/source/socket.c
+
+      source/ti/devices/cc32xx/driverlib/timer.c
+      source/ti/devices/cc32xx/driverlib/udma.c
+
+      kernel/zephyr/dpl/dpl.c
+      kernel/zephyr/dpl/MutexP_zephyr.c
+      kernel/zephyr/dpl/SemaphoreP_zephyr.c
+      kernel/zephyr/dpl/ClockP_zephyr.c
+      kernel/zephyr/dpl/HwiP_zephyr.c
+      )
+
+    # Create library for these two source files because they need to be
+    # built slightly differently. TODO: Use set_source_files_properties
+    # instead?
+    zephyr_library_named(simplelink_wifi_driver)
+    zephyr_library_sources(source/ti/drivers/net/wifi/source/driver.c)
+    zephyr_library_compile_definitions(__LINUX_ERRNO_EXTENSIONS__)
+    zephyr_library_compile_definitions(${COMPILER})
+    zephyr_library_compile_options(-Wno-strict-aliasing) # driver.c warns on strict-aliasing
+
+    zephyr_library_named(simplelink_wifi_sl_socket)
+    zephyr_library_sources(source/ti/drivers/net/wifi/source/sl_socket.c)
+    zephyr_library_compile_definitions(${COMPILER})
+    zephyr_library_compile_options(-Wno-missing-braces) # sl_socket warns on missing braces
+  endif()
+
+elseif(CONFIG_HAS_MSP432P4XXSDK)
+  zephyr_include_directories(
+    source
+    )
+endif()

simplelink/source/ti/devices/CMakeLists.txt

@@ -0,0 +1,3 @@
+add_subdirectory_ifdef(CONFIG_HAS_CC3220SDK cc32xx)
+add_subdirectory_ifdef(CONFIG_HAS_MSP432P4XXSDK msp432p4xx)
+

simplelink/source/ti/devices/cc32xx/CMakeLists.txt

@@ -0,0 +1,16 @@
+zephyr_include_directories(
+  .
+  inc
+  driverlib
+  )
+zephyr_compile_definitions(
+  USE_CC3220_ROM_DRV_API
+  )
+
+zephyr_library()
+zephyr_library_compile_definitions(${COMPILER})
+zephyr_library_sources(
+  driverlib/utils.c
+  driverlib/prcm.c
+  driverlib/pin.c
+  )

simplelink/source/ti/devices/msp432p4xx/CMakeLists.txt

@@ -0,0 +1,11 @@
+zephyr_include_directories(
+  .
+  )
+
+zephyr_library()
+zephyr_library_compile_definitions(${COMPILER})
+zephyr_library_sources(
+  # Need system_msp432p401r for SystemInit which is not in ROM
+  startup_system_files/system_msp432p401r.c
+  )
+