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Toradex Linux images are built using the Yocto Project/OpenEmbedded-core. The same build system can be used to generate SDKs specific to these images. A standard Yocto Project SDK includes:

  • Cross-development toolchain containing cross-compiler, cross-linker, cross-debugger, etc.
  • Native sysroot containing cross compiler, linker and other development tools
  • Target sysroot containing libraries, headers & symbols
  • Environment setup script

For more information, refer to the Yocto Project documentation.

SDK Creation

Whether building an SDK for the standard evaluation Toradex image or for your own custom Toradex image, the method of generating the SDK is the same. After building the image as described in the OpenEmbedded-core article, you can use bitbake to generate the SDK:

bitbake <image_name> -c populate_sdk

The generated SDK will be located at oe-core/deploy/sdk/.

If you need Qt5 tools deployed in your SDK add the following to your image recipe:

inherit populate_sdk populate_sdk_qt5

Note: In earlier build system configurations, the deploy directory was here: 'oe-core/build/out-glibc/deploy/sdk/'. Note: There are a number of recipes (meta-toolchain-xxx.bb) which are alternative ways to build an SDK. Among them meta-toolchain.bb, meta-toolchain-qte, and meta-toolchain-qt5 targeting use on command line, Qt4e, and Qt5 targets. They can be built as follows: 'bitbake meta-toolchain-xxx'. Note that these SDKs do not necessarily include all libraries and headers for the packages deployed in your image nor are all libraries for which the SDK does contain stuff necessarily installed in your image. Note: The SDK filename does not change when you build for a different image_name or a different machine leading to errors like this: 'The recipe meta-toolchain-qt5 is trying to install files into a shared area when those files already exist. ...' Delete the existing file from an earlier run and restart bitbake to get around the issue.

SDK Installation

Execute the generated SDK script file to initiate installation:

./angstrom-glibc-x86_64-armv7at2hf-neon-v2016.12-toolchain.sh

When prompted, accept the default installation path (or enter an alternate path) for the SDK.

Application Development

Begin by changing into the SDK's installation directory and sourcing the environment script:

cd /usr/local/oecore-x86_64
. environment-setup-armv7at2hf-neon-angstrom-linux-gnueabi

Note: Source the environment script in every shell session which you work with the SDK.

The newly exported environment variables expand the PATH variable with the bin directory of the native sysroots (containing cross compiler etc.) and define the SDK's associated cross development tools and flags. To make use of this environment in development, use the environment variables. For example, to compile a C hello world application, use the C compiler variable CC:

$CC hello.c -o hello

IDE Configuration

Eclipse Configuration

Create a new C or C++ project. Select Empty Project and Cross GCC toolchain.

Then, in the toolbar, click Project and select Properties from the drop down menu.

Navigate to C/C++ Build --> Settings

Within the Tool Settings tab, select [All configurations] from the configurations list.

Select Cross GCC Compiler from the Tool Settings menu.

For Command, enter:

${CC}

Under Cross GCC Compiler, select Miscellaneous.

For Other flags, enter:

${CFLAGS} -c

Select Cross G++ Compiler from the Tool Settings menu.

For Command, enter:

${CXX}

Under Cross G++ Compiler, select Miscellaneous.

For Other flags, enter:

${CXXFLAGS} -c

Select Cross G++ Linker from the Tool Settings menu.

For Command, enter:

${CXX}

Under Cross G++ Linker, select Miscellaneous.

For Linker flags, enter:

${LDFLAGS}

Select Cross GCC Assembler from the Tool Settings menu.

For Command, enter:

${AS}

Press OK

Qt Creator Configuration

Qt Creator has its own page.