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.. SPDX-License-Identifier: BSD-3-Clause
Copyright(c) 2010-2014 Intel Corporation.
.. _Development_Kit_Root_Makefile_Help:
Development Kit Root Makefile Help
==================================
The DPDK provides a root level Makefile with targets for configuration, building, cleaning, testing, installation and others.
These targets are explained in the following sections.
Configuration Targets
---------------------
The configuration target requires the name of the target, which is specified using T=mytarget and it is mandatory.
The list of available targets are in $(RTE_SDK)/config (remove the defconfig _ prefix).
Configuration targets also support the specification of the name of the output directory, using O=mybuilddir.
This is an optional parameter, the default output directory is build.
* Config
This will create a build directory, and generates a configuration from a template.
A Makefile is also created in the new build directory.
Example:
.. code-block:: console
make config O=mybuild T=x86_64-native-linuxapp-gcc
Build Targets
-------------
Build targets support the optional specification of the name of the output directory, using O=mybuilddir.
The default output directory is build.
* all, build or just make
Build the DPDK in the output directory previously created by a make config.
Example:
.. code-block:: console
make O=mybuild
* clean
Clean all objects created using make build.
Example:
.. code-block:: console
make clean O=mybuild
* %_sub
Build a subdirectory only, without managing dependencies on other directories.
Example:
.. code-block:: console
make lib/librte_eal_sub O=mybuild
* %_clean
Clean a subdirectory only.
Example:
.. code-block:: console
make lib/librte_eal_clean O=mybuild
Install Targets
---------------
* Install
The list of available targets are in $(RTE_SDK)/config (remove the defconfig\_ prefix).
The GNU standards variables may be used:
http://gnu.org/prep/standards/html_node/Directory-Variables.html and
http://gnu.org/prep/standards/html_node/DESTDIR.html
Example:
.. code-block:: console
make install DESTDIR=myinstall prefix=/usr
Test Targets
------------
* test
Launch automatic tests for a build directory specified using O=mybuilddir.
It is optional, the default output directory is build.
Example:
.. code-block:: console
make test O=mybuild
Documentation Targets
---------------------
* doc
Generate the documentation (API and guides).
* doc-api-html
Generate the Doxygen API documentation in html.
* doc-guides-html
Generate the guides documentation in html.
* doc-guides-pdf
Generate the guides documentation in pdf.
Misc Targets
------------
* help
Show a quick help.
Other Useful Command-line Variables
-----------------------------------
The following variables can be specified on the command line:
* V=
Enable verbose build (show full compilation command line, and some intermediate commands).
* D=
Enable dependency debugging. This provides some useful information about why a target is built or not.
* EXTRA_CFLAGS=, EXTRA_LDFLAGS=, EXTRA_LDLIBS=, EXTRA_ASFLAGS=, EXTRA_CPPFLAGS=
Append specific compilation, link or asm flags.
* CROSS=
Specify a cross toolchain header that will prefix all gcc/binutils applications. This only works when using gcc.
Make in a Build Directory
-------------------------
All targets described above are called from the SDK root $(RTE_SDK).
It is possible to run the same Makefile targets inside the build directory.
For instance, the following command:
.. code-block:: console
cd $(RTE_SDK)
make config O=mybuild T=x86_64-native-linuxapp-gcc
make O=mybuild
is equivalent to:
.. code-block:: console
cd $(RTE_SDK)
make config O=mybuild T=x86_64-native-linuxapp-gcc
cd mybuild
# no need to specify O= now
make
Compiling for Debug
-------------------
To compile the DPDK and sample applications with debugging information included and the optimization level set to 0,
the EXTRA_CFLAGS environment variable should be set before compiling as follows:
.. code-block:: console
export EXTRA_CFLAGS='-O0 -g'
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