Let the build script use a default for toolchain

The `cmake` directory already contains several toolchain files for
various platforms (operating system + architecture). However,
`tools/build.py` does not define a toolchain file for cmake unless
explicitly specified. This patch changes the script to look into
the `cmake` directory for a file named
`toolchain_$(os)_$(arch).cmake` and, if found, pass that to cmake
by default.

OS and arch are determined by `os.uname()`. As Linux on Raspberry
Pi identifies itself as "armv7l", the legacy "armv7l-hf" arch name
is shortened to "armv7l". This way, building jerry on RPi
(natively, not cross) becomes possible by simply running
`tools/build.py` without any extra options.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

.travis.yml

@@ -16,7 +16,7 @@ script: "python tools/run-tests.py $OPTS"
 env:
   - OPTS="--check-signed-off --check-cppcheck --check-vera"
   - OPTS="--jerry-tests --jerry-test-suite"
-  - OPTS="--jerry-tests --jerry-test-suite --toolchain=cmake/toolchain_linux_armv7l-hf.cmake" TIMEOUT=300
+  - OPTS="--jerry-tests --jerry-test-suite --toolchain=cmake/toolchain_linux_armv7l.cmake" TIMEOUT=300
   - OPTS=--buildoption-test
   - OPTS=--unittests
 

cmake/toolchain_linux_armv7l.cmake

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 set(CMAKE_SYSTEM_NAME Linux)
-set(CMAKE_SYSTEM_PROCESSOR armv7l-hf)
+set(CMAKE_SYSTEM_PROCESSOR armv7l)
 
 set(CMAKE_C_COMPILER arm-linux-gnueabihf-gcc)
 #

cmake/toolchain_mcu_stm32f3.cmake

@@ -15,7 +15,7 @@
 include(CMakeForceCompiler)
 
 set(CMAKE_SYSTEM_NAME MCU)
-set(CMAKE_SYSTEM_PROCESSOR armv7l-hf)
+set(CMAKE_SYSTEM_PROCESSOR armv7l)
 set(CMAKE_SYSTEM_VERSION STM32F3)
 
 set(FLAGS_COMMON_ARCH -mlittle-endian -mthumb -mcpu=cortex-m4 -march=armv7e-m -mfpu=fpv4-sp-d16 -mfloat-abi=hard)

cmake/toolchain_mcu_stm32f4.cmake

@@ -15,7 +15,7 @@
 include(CMakeForceCompiler)
 
 set(CMAKE_SYSTEM_NAME MCU)
-set(CMAKE_SYSTEM_PROCESSOR armv7l-hf)
+set(CMAKE_SYSTEM_PROCESSOR armv7l)
 set(CMAKE_SYSTEM_VERSION STM32F4)
 
 set(FLAGS_COMMON_ARCH -mlittle-endian -mthumb -mcpu=cortex-m4 -march=armv7e-m -mfpu=fpv4-sp-d16 -mfloat-abi=hard)

docs/01.GETTING-STARTED.md

@@ -74,7 +74,7 @@ python tools/build.py --toolchain=TOOLCHAIN
 For example the cross-compile to RaspberryPi 2 is something like this:
 
 ```bash
-python tools/build.py --toolchain=cmake/toolchain_linux_armv7l-hf.cmake
+python tools/build.py --toolchain=cmake/toolchain_linux_armv7l.cmake
 ```
 
 ##### To get a list of all the available buildoptions for Linux:

jerry-libc/CMakeLists.txt

@@ -20,7 +20,7 @@ project (${JERRY_LIBC_NAME} C ASM)
 # Architecture-specific configuration
 if(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "x86_64")
   set(DEFINES_LIBC ${DEFINES_LIBC} __TARGET_HOST_x64)
-elseif(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "armv7l-hf")
+elseif(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "armv7l")
   set(DEFINES_LIBC ${DEFINES_LIBC} __TARGET_HOST_ARMv7 __TARGET_HOST_ARMv7_HARD_FLOAT)
 elseif(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "armv7l-el")
   set(DEFINES_LIBC ${DEFINES_LIBC} __TARGET_HOST_ARMv7 __TARGET_HOST_ARMv7_SOFT_FLOAT)

targets/nuttx-stm32f4/Makefile.nuttx

@@ -40,7 +40,7 @@ all:
 	 -DENABLE_LTO=OFF \
 	 -DENABLE_VALGRIND=OFF \
 	 -DCMAKE_TOOLCHAIN_FILE=build/configs/toolchain_external.cmake \
-	 -DEXTERNAL_CMAKE_SYSTEM_PROCESSOR=armv7l-hf \
+	 -DEXTERNAL_CMAKE_SYSTEM_PROCESSOR=armv7l \
 	 -DEXTERNAL_CMAKE_C_COMPILER=arm-none-eabi-gcc \
 	 -DEXTERNAL_CMAKE_C_COMPILER_ID=GNU \
 	 -DEXTERNAL_BUILD_ENTRY_FILE=./targets/nuttx-stm32f4/main-nuttx.c \

targets/riot-stm32f4/Makefile.riot

@@ -37,7 +37,7 @@ libjerry:
 	 -DJERRY_CMDLINE=OFF \
 	 -DCOMPILER_DEFAULT_LIBC=ON \
 	 -DENABLE_ALL_IN_ONE=OFF \
-	 -DEXTERNAL_CMAKE_SYSTEM_PROCESSOR=armv7l-hf \
+	 -DEXTERNAL_CMAKE_SYSTEM_PROCESSOR=armv7l \
 	 -DEXTERNAL_CMAKE_C_COMPILER=arm-none-eabi-gcc \
 	 -DEXTERNAL_CMAKE_C_COMPILER_ID=GNU \
 	 -DEXTERNAL_COMPILE_FLAGS="$(EXT_CFLAGS)" \

tools/build.py

@@ -19,11 +19,16 @@ import argparse
 import shutil
 import subprocess
 import sys
-from os import makedirs
+from os import makedirs, uname
 from settings import *
 
 BUILD_DIR = path.join(PROJECT_DIR, 'build')
 
+def default_toolchain():
+    (sysname, _, _, _, machine) = uname()
+    toolchain = path.join(PROJECT_DIR, 'cmake', 'toolchain_%s_%s.cmake' % (sysname.lower(), machine.lower()))
+    return toolchain if path.isfile(toolchain) else None
+
 def add_build_args(parser):
     parser.add_argument('--verbose', '-v', action='store_const', const='ON', default='OFF', help='Increase verbosity')
     parser.add_argument('--unittests', action='store_const', const='ON', default='OFF', help='Build unittests too')
@@ -45,7 +50,7 @@ def add_build_args(parser):
     parser.add_argument('--cmake-param', action='append', default=[], help='Add custom arguments to CMake')
     parser.add_argument('--compile-flag', action='append', default=[], help='Add custom compile flag')
     parser.add_argument('--linker-flag', action='append', default=[], help='Add custom linker flag')
-    parser.add_argument('--toolchain', action='store', default='', help='Add toolchain file')
+    parser.add_argument('--toolchain', action='store', default=default_toolchain(), help='Add toolchain file (default: %(default)s)')
     parser.add_argument('--jerry-libc', choices=['on', 'off'], default='on', help='Use jerry-libc (default: %(default)s)')
     parser.add_argument('--compiler-default-libc', choices=['on', 'off'], default='off', help='Use compiler-default libc (default: %(default)s)')
     parser.add_argument('--jerry-core', choices=['on', 'off'], default='on', help='Use jerry-core (default: %(default)s)')