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.. SPDX-License-Identifier: BSD-3-Clause
Copyright(c) 2010-2014 Intel Corporation.
.. _External_Application/Library_Makefile_help:
External Application/Library Makefile help
==========================================
External applications or libraries should include specific Makefiles from RTE_SDK, located in mk directory.
These Makefiles are:
* ${RTE_SDK}/mk/rte.extapp.mk: Build an application
* ${RTE_SDK}/mk/rte.extlib.mk: Build a static library
* ${RTE_SDK}/mk/rte.extobj.mk: Build objects (.o)
Prerequisites
-------------
The following variables must be defined:
* ${RTE_SDK}: Points to the root directory of the DPDK.
* ${RTE_TARGET}: Reference the target to be used for compilation (for example, x86_64-native-linuxapp-gcc).
Build Targets
-------------
Build targets support the specification of the name of the output directory, using O=mybuilddir.
This is optional; the default output directory is build.
* all, "nothing" (meaning just make)
Build the application or the library in the specified output directory.
Example:
.. code-block:: console
make O=mybuild
* clean
Clean all objects created using make build.
Example:
.. code-block:: console
make clean O=mybuild
Help Targets
------------
* help
Show this help.
Other Useful Command-line Variables
-----------------------------------
The following variables can be specified at the command line:
* S=
Specify the directory in which the sources are located. By default, it is the current directory.
* M=
Specify the Makefile to call once the output directory is created. By default, it uses $(S)/Makefile.
* 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 must be rebuilt or not.
* EXTRA_CFLAGS=, EXTRA_LDFLAGS=, 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 from Another Directory
---------------------------
It is possible to run the Makefile from another directory, by specifying the output and the source dir. For example:
.. code-block:: console
export RTE_SDK=/path/to/DPDK
export RTE_TARGET=x86_64-native-linuxapp-icc
make -f /path/to/my_app/Makefile S=/path/to/my_app O=/path/to/build_dir
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