xref: /dpdk/doc/guides/prog_guide/build_app.rst (revision 82822753bd7c8124dd001cd04d060d72f43fc82c) 
1..  SPDX-License-Identifier: BSD-3-Clause
2    Copyright(c) 2010-2014 Intel Corporation.
3
4.. _Building_Your_Own_Application:
5
6Building Your Own Application
7=============================
8
9Compiling a Sample Application in the Development Kit Directory
10---------------------------------------------------------------
11
12When compiling a sample application (for example, hello world), the following variables must be exported:
13RTE_SDK and RTE_TARGET.
14
15.. code-block:: console
16
17    ~/DPDK$ cd examples/helloworld/
18    ~/DPDK/examples/helloworld$ export RTE_SDK=/home/user/DPDK
19    ~/DPDK/examples/helloworld$ export RTE_TARGET=x86_64-native-linux-gcc
20    ~/DPDK/examples/helloworld$ make
21        CC main.o
22        LD helloworld
23        INSTALL-APP helloworld
24        INSTALL-MAP helloworld.map
25
26The binary is generated in the build directory by default:
27
28.. code-block:: console
29
30    ~/DPDK/examples/helloworld$ ls build/app
31    helloworld helloworld.map
32
33Build Your Own Application Outside the Development Kit
34------------------------------------------------------
35
36The sample application (Hello World) can be duplicated in a new directory as a starting point for your development:
37
38.. code-block:: console
39
40    ~$ cp -r DPDK/examples/helloworld my_rte_app
41    ~$ cd my_rte_app/
42    ~/my_rte_app$ export RTE_SDK=/home/user/DPDK
43    ~/my_rte_app$ export RTE_TARGET=x86_64-native-linux-gcc
44    ~/my_rte_app$ make
45        CC main.o
46        LD helloworld
47        INSTALL-APP helloworld
48        INSTALL-MAP helloworld.map
49
50Customizing Makefiles
51---------------------
52
53Application Makefile
54~~~~~~~~~~~~~~~~~~~~
55
56The default makefile provided with the Hello World sample application is a good starting point. It includes:
57
58*   $(RTE_SDK)/mk/rte.vars.mk at the beginning
59
60*   $(RTE_SDK)/mk/rte.extapp.mk at the end
61
62The user must define several variables:
63
64*   APP: Contains the name of the application.
65
66*   SRCS-y: List of source files (\*.c, \*.S).
67
68Library Makefile
69~~~~~~~~~~~~~~~~
70
71It is also possible to build a library in the same way:
72
73*   Include $(RTE_SDK)/mk/rte.vars.mk at the beginning.
74
75*   Include $(RTE_SDK)/mk/rte.extlib.mk  at the end.
76
77The only difference is that APP should be replaced by LIB, which contains the name of the library. For example, libfoo.a.
78
79Customize Makefile Actions
80~~~~~~~~~~~~~~~~~~~~~~~~~~
81
82Some variables can be defined to customize Makefile actions. The most common are listed below. Refer to
83:ref:`Makefile Description <Makefile_Description>` section in
84:ref:`Development Kit Build System <Development_Kit_Build_System>`
85
86chapter for details.
87
88*   VPATH: The path list where the build system will search for sources. By default,
89    RTE_SRCDIR will be included in VPATH.
90
91*   CFLAGS_my_file.o: The specific flags to add for C compilation of my_file.c.
92
93*   CFLAGS: The flags to use for C compilation.
94
95*   LDFLAGS: The flags to use for linking.
96
97*   CPPFLAGS: The flags to use to provide flags to the C preprocessor (only useful when assembling .S files)
98
99*   LDLIBS: A list of libraries to link with (for example, -L /path/to/libfoo - lfoo)
100