doc: update build instructions in the Linux guide

Before removing the "make" build system completely,
the Linux guide instructions are made more concise and accurate.
Some detailed explanations are also available in
doc/guides/prog_guide/dev_kit_root_make_help.rst

This is the swan song for makefile system,
in order to have accurate information backported in LTS.

Cc: stable@dpdk.org
Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: David Marchand <david.marchand@redhat.com>

diff --git a/doc/guides/linux_gsg/build_dpdk.rst b/doc/guides/linux_gsg/build_dpdk.rst
index 4aeb469..c536e35 100644 (file)
--- a/doc/guides/linux_gsg/build_dpdk.rst
+++ b/doc/guides/linux_gsg/build_dpdk.rst
@@ -167,60 +167,32 @@ Installation of DPDK Target Environment using Make
    is therefore recommended that DPDK installation is done using meson and
    ninja as described above.
 
-The format of a DPDK target is::
+Get a native target environment automatically::
 
-    ARCH-MACHINE-EXECENV-TOOLCHAIN
-
-where:
-
-* ``ARCH`` can be:  ``i686``, ``x86_64``, ``ppc_64``, ``arm64``
-
-* ``MACHINE`` can be:  ``native``, ``power8``, ``armv8a``
-
-* ``EXECENV`` can be:  ``linux``,  ``freebsd``
-
-* ``TOOLCHAIN`` can be:  ``gcc``,  ``icc``
-
-The targets to be installed depend on the 32-bit and/or 64-bit packages and compilers installed on the host.
-Available targets can be found in the DPDK/config directory.
-The defconfig\_ prefix should not be used.
+   make defconfig O=mybuild
 
 .. note::
 
-    Configuration files are provided with the ``RTE_MACHINE`` optimization level set.
     Within the configuration files, the ``RTE_MACHINE`` configuration value is set to native,
     which means that the compiled software is tuned for the platform on which it is built.
-    For more information on this setting, and its possible values, see the *DPDK Programmers Guide*.
 
-When using the Intel® C++ Compiler (icc), one of the following commands should be invoked for 64-bit or 32-bit use respectively.
-Notice that the shell scripts update the ``$PATH`` variable and therefore should not be performed in the same session.
-Also, verify the compiler's installation directory since the path may be different:
+Or get a specific target environment::
 
-.. code-block:: console
+   make config T=x86_64-native-linux-gcc O=mybuild
 
-    source /opt/intel/bin/iccvars.sh intel64
-    source /opt/intel/bin/iccvars.sh ia32
+The format of a DPDK target is "ARCH-MACHINE-EXECENV-TOOLCHAIN".
+Available targets can be found with::
 
-To install and make targets, use the ``make install T=<target>`` command in the top-level DPDK directory.
+   make help
 
-For example, to compile a 64-bit target using icc, run:
+Customize the target configuration in the generated ``.config`` file.
+Example for enabling the pcap PMD::
 
-.. code-block:: console
+   sed -ri 's,(PMD_PCAP=).*,\1y,' mybuild/.config
 
-    make install T=x86_64-native-linux-icc
+Compile the target::
 
-To compile a 32-bit build using gcc, the make command should be:
-
-.. code-block:: console
-
-    make install T=i686-native-linux-gcc
-
-To prepare a target without building it, for example, if the configuration changes need to be made before compilation,
-use the ``make config T=<target>`` command:
-
-.. code-block:: console
-
-    make config T=x86_64-native-linux-gcc
+   make -j4 O=mybuild
 
 .. warning::
 
@@ -229,15 +201,13 @@ use the ``make config T=<target>`` command:
     If the DPDK is not being built on the target machine,
     the ``RTE_KERNELDIR`` environment variable should be used to point the compilation at a copy of the kernel version to be used on the target machine.
 
-Once the target environment is created, the user may move to the target environment directory and continue to make code changes and re-compile.
-The user may also make modifications to the compile-time DPDK configuration by editing the .config file in the build directory.
-(This is a build-local copy of the defconfig file from the top- level config directory).
+Install the target in a separate directory::
 
-.. code-block:: console
+   make install O=mybuild DESTDIR=myinstall prefix=
+
+The environment is ready to build a DPDK application::
 
-    cd x86_64-native-linux-gcc
-    vi .config
-    make
+   RTE_SDK=$(pwd)/myinstall/share/dpdk RTE_TARGET=x86_64-native-linux-gcc make -C myapp
 
 In addition, the make clean command can be used to remove any existing compiled files for a subsequent full, clean rebuild of the code.
 
@@ -245,5 +215,5 @@ Browsing the Installed DPDK Environment Target
 ----------------------------------------------
 
 Once a target is created it contains all libraries, including poll-mode drivers, and header files for the DPDK environment that are required to build customer applications.
-In addition, the test and testpmd applications are built under the build/app directory, which may be used for testing.
+In addition, the test applications are built under the app directory, which may be used for testing.
 A kmod  directory is also present that contains kernel modules which may be loaded if needed.