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-<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
-"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
-[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
-
-<chapter id='using-the-command-line'>
-<title>Using the Command Line</title>
-
- <para>
- Recall that earlier the manual discussed how to use an existing toolchain
- tarball that had been installed into the default installation
- directory, <filename>/opt/poky/&DISTRO;</filename>, which is outside of the
- <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>
- (see the section "<link linkend='using-an-existing-toolchain-tarball'>Using a Cross-Toolchain Tarball)</link>".
- And, that sourcing your architecture-specific environment setup script
- initializes a suitable cross-toolchain development environment.
- </para>
-
- <para>
- During this setup, locations for the compiler, QEMU scripts, QEMU binary,
- a special version of <filename>pkgconfig</filename> and other useful
- utilities are added to the <filename>PATH</filename> variable.
- Also, variables to assist
- <filename>pkgconfig</filename> and <filename>autotools</filename>
- are also defined so that, for example, <filename>configure.sh</filename>
- can find pre-generated test results for tests that need target hardware
- on which to run.
- You can see the
- "<link linkend='setting-up-the-cross-development-environment'>Setting Up the Cross-Development Environment</link>"
- section for the list of cross-toolchain environment variables
- established by the script.
- </para>
-
- <para>
- Collectively, these conditions allow you to easily use the toolchain
- outside of the OpenEmbedded build environment on both Autotools-based
- projects and Makefile-based projects.
- This chapter provides information for both these types of projects.
- </para>
-
-
-<section id='autotools-based-projects'>
-<title>Autotools-Based Projects</title>
-
- <para>
- Once you have a suitable cross-toolchain installed, it is very easy to
- develop a project outside of the OpenEmbedded build system.
- This section presents a simple "Helloworld" example that shows how
- to set up, compile, and run the project.
- </para>
-
- <section id='creating-and-running-a-project-based-on-gnu-autotools'>
- <title>Creating and Running a Project Based on GNU Autotools</title>
-
- <para>
- Follow these steps to create a simple Autotools-based project:
- <orderedlist>
- <listitem><para><emphasis>Create your directory:</emphasis>
- Create a clean directory for your project and then make
- that directory your working location:
- <literallayout class='monospaced'>
- $ mkdir $HOME/helloworld
- $ cd $HOME/helloworld
- </literallayout></para></listitem>
- <listitem><para><emphasis>Populate the directory:</emphasis>
- Create <filename>hello.c</filename>, <filename>Makefile.am</filename>,
- and <filename>configure.in</filename> files as follows:
- <itemizedlist>
- <listitem><para>For <filename>hello.c</filename>, include
- these lines:
- <literallayout class='monospaced'>
- #include &lt;stdio.h&gt;
-
- main()
- {
- printf("Hello World!\n");
- }
- </literallayout></para></listitem>
- <listitem><para>For <filename>Makefile.am</filename>,
- include these lines:
- <literallayout class='monospaced'>
- bin_PROGRAMS = hello
- hello_SOURCES = hello.c
- </literallayout></para></listitem>
- <listitem><para>For <filename>configure.in</filename>,
- include these lines:
- <literallayout class='monospaced'>
- AC_INIT(hello.c)
- AM_INIT_AUTOMAKE(hello,0.1)
- AC_PROG_CC
- AC_PROG_INSTALL
- AC_OUTPUT(Makefile)
- </literallayout></para></listitem>
- </itemizedlist></para></listitem>
- <listitem><para><emphasis>Source the cross-toolchain
- environment setup file:</emphasis>
- Installation of the cross-toolchain creates a cross-toolchain
- environment setup script in the directory that the ADT
- was installed.
- Before you can use the tools to develop your project, you must
- source this setup script.
- The script begins with the string "environment-setup" and contains
- the machine architecture, which is followed by the string
- "poky-linux".
- Here is an example that sources a script from the
- default ADT installation directory that uses the
- 32-bit Intel x86 Architecture and the
- &DISTRO_NAME; Yocto Project release:
- <literallayout class='monospaced'>
- $ source /opt/poky/&DISTRO;/environment-setup-i586-poky-linux
- </literallayout></para></listitem>
- <listitem><para><emphasis>Generate the local aclocal.m4
- files and create the configure script:</emphasis>
- The following GNU Autotools generate the local
- <filename>aclocal.m4</filename> files and create the
- configure script:
- <literallayout class='monospaced'>
- $ aclocal
- $ autoconf
- </literallayout></para></listitem>
- <listitem><para><emphasis>Generate files needed by GNU
- coding standards:</emphasis>
- GNU coding standards require certain files in order for the
- project to be compliant.
- This command creates those files:
- <literallayout class='monospaced'>
- $ touch NEWS README AUTHORS ChangeLog
- </literallayout></para></listitem>
- <listitem><para><emphasis>Generate the configure
- file:</emphasis>
- This command generates the <filename>configure</filename>:
- <literallayout class='monospaced'>
- $ automake -a
- </literallayout></para></listitem>
- <listitem><para><emphasis>Cross-compile the project:</emphasis>
- This command compiles the project using the cross-compiler.
- The
- <ulink url='&YOCTO_DOCS_REF_URL;#var-CONFIGURE_FLAGS'><filename>CONFIGURE_FLAGS</filename></ulink>
- environment variable provides the minimal arguments for
- GNU configure:
- <literallayout class='monospaced'>
- $ ./configure ${CONFIGURE_FLAGS}
- </literallayout></para></listitem>
- <listitem><para><emphasis>Make and install the project:</emphasis>
- These two commands generate and install the project into the
- destination directory:
- <literallayout class='monospaced'>
- $ make
- $ make install DESTDIR=./tmp
- </literallayout></para></listitem>
- <listitem><para><emphasis>Verify the installation:</emphasis>
- This command is a simple way to verify the installation
- of your project.
- Running the command prints the architecture on which
- the binary file can run.
- This architecture should be the same architecture that
- the installed cross-toolchain supports.
- <literallayout class='monospaced'>
- $ file ./tmp/usr/local/bin/hello
- </literallayout></para></listitem>
- <listitem><para><emphasis>Execute your project:</emphasis>
- To execute the project in the shell, simply enter the name.
- You could also copy the binary to the actual target hardware
- and run the project there as well:
- <literallayout class='monospaced'>
- $ ./hello
- </literallayout>
- As expected, the project displays the "Hello World!" message.
- </para></listitem>
- </orderedlist>
- </para>
- </section>
-
- <section id='passing-host-options'>
- <title>Passing Host Options</title>
-
- <para>
- For an Autotools-based project, you can use the cross-toolchain by just
- passing the appropriate host option to <filename>configure.sh</filename>.
- The host option you use is derived from the name of the environment setup
- script found in the directory in which you installed the cross-toolchain.
- For example, the host option for an ARM-based target that uses the GNU EABI
- is <filename>armv5te-poky-linux-gnueabi</filename>.
- You will notice that the name of the script is
- <filename>environment-setup-armv5te-poky-linux-gnueabi</filename>.
- Thus, the following command works to update your project and
- rebuild it using the appropriate cross-toolchain tools:
- <literallayout class='monospaced'>
- $ ./configure --host=armv5te-poky-linux-gnueabi \
- --with-libtool-sysroot=<replaceable>sysroot_dir</replaceable>
- </literallayout>
- <note>
- If the <filename>configure</filename> script results in problems recognizing the
- <filename>--with-libtool-sysroot=</filename><replaceable>sysroot-dir</replaceable> option,
- regenerate the script to enable the support by doing the following and then
- run the script again:
- <literallayout class='monospaced'>
- $ libtoolize --automake
- $ aclocal -I ${OECORE_NATIVE_SYSROOT}/usr/share/aclocal \
- [-I <replaceable>dir_containing_your_project-specific_m4_macros</replaceable>]
- $ autoconf
- $ autoheader
- $ automake -a
- </literallayout>
- </note>
- </para>
- </section>
-</section>
-
-<section id='makefile-based-projects'>
-<title>Makefile-Based Projects</title>
-
- <para>
- For Makefile-based projects, the cross-toolchain environment variables
- established by running the cross-toolchain environment setup script
- are subject to general <filename>make</filename> rules.
- </para>
-
- <para>
- To illustrate this, consider the following four cross-toolchain
- environment variables:
- <literallayout class='monospaced'>
- <ulink url='&YOCTO_DOCS_REF_URL;#var-CC'>CC</ulink>=i586-poky-linux-gcc -m32 -march=i586 --sysroot=/opt/poky/1.8/sysroots/i586-poky-linux
- <ulink url='&YOCTO_DOCS_REF_URL;#var-LD'>LD</ulink>=i586-poky-linux-ld --sysroot=/opt/poky/1.8/sysroots/i586-poky-linux
- <ulink url='&YOCTO_DOCS_REF_URL;#var-CFLAGS'>CFLAGS</ulink>=-O2 -pipe -g -feliminate-unused-debug-types
- <ulink url='&YOCTO_DOCS_REF_URL;#var-CXXFLAGS'>CXXFLAGS</ulink>=-O2 -pipe -g -feliminate-unused-debug-types
- </literallayout>
- Now, consider the following three cases:
- <itemizedlist>
- <listitem><para><emphasis>Case 1 - No Variables Set in the <filename>Makefile</filename>:</emphasis>
- Because these variables are not specifically set in the
- <filename>Makefile</filename>, the variables retain their
- values based on the environment.
- </para></listitem>
- <listitem><para><emphasis>Case 2 - Variables Set in the <filename>Makefile</filename>:</emphasis>
- Specifically setting variables in the
- <filename>Makefile</filename> during the build results in the
- environment settings of the variables being overwritten.
- </para></listitem>
- <listitem><para><emphasis>Case 3 - Variables Set when the <filename>Makefile</filename> is Executed from the Command Line:</emphasis>
- Executing the <filename>Makefile</filename> from the command
- line results in the variables being overwritten with
- command-line content regardless of what is being set in the
- <filename>Makefile</filename>.
- In this case, environment variables are not considered unless
- you use the "-e" flag during the build:
- <literallayout class='monospaced'>
- $ make -e <replaceable>file</replaceable>
- </literallayout>
- If you use this flag, then the environment values of the
- variables override any variables specifically set in the
- <filename>Makefile</filename>.
- </para></listitem>
- </itemizedlist>
- <note>
- For the list of variables set up by the cross-toolchain environment
- setup script, see the
- "<link linkend='setting-up-the-cross-development-environment'>Setting Up the Cross-Development Environment</link>"
- section.
- </note>
- </para>
-</section>
-</chapter>
-<!--
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