Cross Compiling - Revision history

M at 20:02, 29 November 2016

2016-11-29T20:02:30Z

← Older revision		Revision as of 20:02, 29 November 2016
Line 253:		Line 253:
	set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)		set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

			\|}
			{\| class="mw-collapsible mw-collapsed wikitable"
			! CMakeLists.txt example
			\|-
			\|
			cmake_minimum_required(VERSION 2.8)

			# MDM silently append relative paths to absolute paths without warnings
			cmake_policy(SET CMP0015 NEW)

			# MDM Set the executable name!
			# project(nop-bigress-client-c)
			project(nop-client)

			# -------------------------------
			# To ensure we get a static build.
			# For this to work, the linker needs to be able to find all libraries.
			# Make sure they are included next in [include\|link]_directories.
			# Also make sure they are included in TARGET_LINK_LIBRARIES.
			# -------------------------------
			SET(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
			SET(BUILD_SHARED_LIBRARIES OFF)
			SET(CMAKE_EXE_LINKER_FLAGS "-static")
			# -------------------------------

			# -------------------------------
			# MDM For cross compile, we must provide all lib paths.
			# We have ours: /home/m/development/armv4
			# And the toolchain is here: /opt/crosstool-source-v4/arm-926ejs-linux-gnueabi
			# -------------------------------
			include_directories(/home/m/development/armv4/include /opt/crosstool-source-v4/arm-926ejs-linux-gnueabi/include)
			link_directories(/home/m/development/armv4/lib /opt/crosstool-source-v4/arm-926ejs-linux-gnueabi/lib)
			# -------------------------------

			# -------------------------------
			# MDM Build everything in ./src
			# -------------------------------
			# WARNING: [make] won't pick up new files until you rerun [cmake].
			# Change this to be explicit if that becomes a problem.
			# Easy to change:
			# set( NOP_SOURCES src/nop_client.c src/helpers.c )
			aux_source_directory(./src NOP_SOURCES)

			add_executable(
			${PROJECT_NAME}
			${NOP_SOURCES}
			)

			# The main linker line used to create the executable
			# MDM added [c] after ubuntu xenial started giving segfaults in dl -> openssl - didn't help!
			# see http://stackoverflow.com/questions/7526255/unknown-reference-to-dlopen-in-dlopen
			# TARGET_LINK_LIBRARIES(${PROJECT_NAME} websockets ssl crypto pthread dl z c)
			# MDM NO LINKING since we built websockets static! no, this doesn't work...
			#TARGET_LINK_LIBRARIES(${PROJECT_NAME} websockets)
			# MDM cJSON requires floor + pow, in the C math lib, so we add "m"
			TARGET_LINK_LIBRARIES(${PROJECT_NAME} websockets ssl crypto pthread dl z c m)
	\|}		\|}

M at 20:00, 29 November 2016

2016-11-29T20:00:15Z

Show changes

M at 19:57, 29 November 2016

2016-11-29T19:57:18Z

← Older revision		Revision as of 19:57, 29 November 2016
Line 1:		Line 1:
	Issues:		Issues:
	* need cross compile toolchain		* need cross compile toolchain
			** you need to find or build an entire toolchain environment; ubuntu has some, others have some, Crosstool-NG will build one from scratch
			** for autotools, you typically need to define tools like ar, gcc, g++ in the build script
			** for cmake, you typically need a toolchain file to specify details
	* need to cross compile any dependencies (static link what you can)		* need to cross compile any dependencies (static link what you can)
	{\| class="mw-collapsible mw-collapsed wikitable"		{\| class="mw-collapsible mw-collapsed wikitable"

M at 22:25, 25 November 2016

2016-11-25T22:25:51Z

← Older revision		Revision as of 22:25, 25 November 2016
Line 49:		Line 49:
	cd ..		cd ..
	fi		fi
			\|}
	** libwebsockets example		** libwebsockets example
	* need to match the libraries on target machine for any dynamic linking requirements		* need to match the libraries on target machine for any dynamic linking requirements
	* need to match the build to the target kernel (or you might get "kernel too old")		* need to match the build to the target kernel (or you might get "kernel too old")

M at 22:25, 25 November 2016

2016-11-25T22:25:27Z

← Older revision		Revision as of 22:25, 25 November 2016
Line 25:		Line 25:
	fi		fi
	\|}		\|}
	** {\| class="mw-collapsible mw-collapsed wikitable"		{\| class="mw-collapsible mw-collapsed wikitable"
	! openssl example		! openssl example
	\|-		\|-

M at 22:25, 25 November 2016

2016-11-25T22:25:17Z

← Older revision		Revision as of 22:25, 25 November 2016
Line 25:		Line 25:
	fi		fi
	\|}		\|}
	** openssl example		** {\| class="mw-collapsible mw-collapsed wikitable"
			! openssl example
			\|-
			\|
	echo Getting source code for libraries...		echo Getting source code for libraries...
	if [ ! -d openssl ]; then		if [ ! -d openssl ]; then

M at 22:24, 25 November 2016

2016-11-25T22:24:40Z

← Older revision		Revision as of 22:24, 25 November 2016
Line 2:		Line 2:
	* need cross compile toolchain		* need cross compile toolchain
	* need to cross compile any dependencies (static link what you can)		* need to cross compile any dependencies (static link what you can)
	~~{\| class="mw-collapsible mw-collapsed wikitable"~~
	~~! OS installation~~
	\|-
	\|
	{\| class="mw-collapsible mw-collapsed wikitable"		{\| class="mw-collapsible mw-collapsed wikitable"
	! libz example		! libz example

M at 22:24, 25 November 2016

2016-11-25T22:24:23Z

← Older revision		Revision as of 22:24, 25 November 2016
Line 2:		Line 2:
	* need cross compile toolchain		* need cross compile toolchain
	* need to cross compile any dependencies (static link what you can)		* need to cross compile any dependencies (static link what you can)
	** libz example		{\| class="mw-collapsible mw-collapsed wikitable"
			! OS installation
			\|-
			\|
			{\| class="mw-collapsible mw-collapsed wikitable"
			! libz example
			\|-
			\|
	echo Getting source code for libraries...		echo Getting source code for libraries...
	if [ ! -d zlib ]; then		if [ ! -d zlib ]; then
Line 21:		Line 28:
	cd ..		cd ..
	fi		fi
			\|}
	** openssl example		** openssl example
	echo Getting source code for libraries...		echo Getting source code for libraries...

M: Created page with "Issues: * need cross compile toolchain * need to cross compile any dependencies (static link what you can) ** libz example echo Getting source code for libraries... if..."

2016-11-25T22:23:08Z

Created page with "Issues: * need cross compile toolchain * need to cross compile any dependencies (static link what you can) ** libz example echo Getting source code for libraries... if..."

New page

Issues:
* need cross compile toolchain
* need to cross compile any dependencies (static link what you can)
** libz example
echo Getting source code for libraries...
if [ ! -d zlib ]; then
wget http://zlib.net/zlib-${zlib_version}.tar.gz
untar zlib-${zlib_version}.tar.gz
ln -s zlib-${zlib_version} zlib
fi
echo Building libraries...
if [ "$rebuild_libs" = true ]; then

export cross=arm-linux-gnueabi-

# ZLIB
cd zlib
./configure --prefix=${install_root}
make CC="${cross}gcc" AR="${cross}ar r" RANLIB="${cross}ranlib"
make install
cd ..
fi
** openssl example
echo Getting source code for libraries...
if [ ! -d openssl ]; then
wget https://www.openssl.org/source/openssl-${openssl_version}.tar.gz
untar openssl-${openssl_version}.tar.gz
ln -s openssl-${openssl_version} openssl
fi

echo Building libraries...

if [ "$rebuild_libs" = true ]; then

export cross=arm-linux-gnueabi-

# OPENSSL
cd openssl
./Configure dist --prefix=${install_root} --openssldir=${install_root}
make CC="${cross}gcc" AR="${cross}ar r" RANLIB="${cross}ranlib"
make install
cd ..
fi
** libwebsockets example
* need to match the libraries on target machine for any dynamic linking requirements
* need to match the build to the target kernel (or you might get "kernel too old")