lfs-book-zh_CN/chapter05/binutils-pass1.xml

<sect1 id="ch05-binutils-pass1">
<title>Installing Binutils-&binutils-version; - Pass 1</title>
<?dbhtml filename="binutils-pass1.html" dir="chapter05"?>

<screen>Estimated build time:           &binutils-time-tools-pass1;
Estimated required disk space:  &binutils-compsize-tools-pass1;</screen>

&aa-binutils-down;
&aa-binutils-dep;

<sect2><title>&nbsp;</title><para>&nbsp;</para></sect2>

<sect2>
<title>Installation of Binutils</title>

<para>It is important that Binutils be the first package to get compiled,
because both Glibc and GCC perform various tests on the available linker and
assembler to determine which of their own features to enable.</para>

<para>This package is known to behave badly when you have changed its default
optimization flags (including the -march and -mcpu options). Therefore, if
you have defined any environment variables that override default
optimizations, such as CFLAGS and CXXFLAGS, we recommend unsetting or
modifying them when building Binutils.</para>

<para>The Binutils documentation recommends building Binutils outside of the
source directory in a dedicated build directory:</para>

<screen><userinput>mkdir ../binutils-build
cd ../binutils-build</userinput></screen>

<note><para>If you want the SBU values listed in the rest of the book to be of
any use, you will have to measure the time it takes to build this package. To
achieve this easily, you could do something like:
<userinput>time { ./configure ... &amp;&amp; ... &amp;&amp; ... &amp;&amp; make install; }</userinput>.</para></note>

<para>Now prepare Binutils for compilation:</para>

<screen><userinput>../&binutils-dir;/configure \
&nbsp;&nbsp;&nbsp;&nbsp;--prefix=/tools --disable-nls</userinput></screen>

<para>The meaning of the configure options:</para>

<itemizedlist>
<listitem><para><userinput>--prefix=/tools</userinput>: This tells the
configure script to prepare to install the Binutils programs in the
<filename>/tools</filename> directory.</para></listitem>

<listitem><para><userinput>--disable-nls</userinput>: This disables
internationalization (a word often shortened to i18n). We don't need this
for our static programs and <emphasis>nls</emphasis> often causes problems
when linking statically.</para></listitem>
</itemizedlist>

<para>Continue with compiling the package:</para>

<screen><userinput>make configure-host
make LDFLAGS="-all-static"</userinput></screen>

<para>The meaning of the make parameters:</para>

<itemizedlist>
<listitem><para><userinput>configure-host</userinput>: This forces all the
subdirectories to be configured immediately. A statically linked build will
fail without it. We therefore use this option to work around the
problem.</para></listitem>

<listitem><para><userinput>LDFLAGS="-all-static"</userinput>: This tells the
linker that all the Binutils programs should be linked statically. However,
strictly speaking, <userinput>"-all-static"</userinput> is first passed to the
<emphasis>libtool</emphasis> program which then passes
<userinput>"-static"</userinput> on to the linker.</para></listitem>
</itemizedlist>

<para>Compilation is now complete. This is the point where we would normally
run the test suite. But as discussed earlier, we don't recommend running the
test suites for the temporary tools here in this chapter. However, even if we
still wanted to run the Binutils test suite, we're unable do so at this early
stage because the test suite framework is not yet in place. Not only that, the
programs from this first pass will soon be overwritten by those installed in
the second pass.</para>

<para>And install the package:</para>

<screen><userinput>make install</userinput></screen>

<para>Now prepare the linker for the "locking in" of Glibc later on:</para>

<screen><userinput>make -C ld clean
make -C ld LDFLAGS="-all-static" LIB_PATH=/tools/lib</userinput></screen>

<para>The meaning of the make parameters:</para>

<itemizedlist>
<listitem><para><userinput>-C ld clean</userinput>: This tells the make program
to remove all the compiled files, but only in the <filename>ld</filename>
subdirectory.</para></listitem>

<listitem><para><userinput>-C ld LDFLAGS="-all-static" LIB_PATH=/tools/lib</userinput>:
This option rebuilds everything in the <filename>ld</filename> subdirectory.
Specifying the LIB_PATH makefile variable on the command line allows us to
override the default value and have it point to our temporary tools location.
The value of this variable specifies the linker's default library search path.
You'll see how this preparation is used later on in the
chapter.</para></listitem>
</itemizedlist>

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<warning><para>Do not yet remove the Binutils build and source directories. You
will need them again in their current state a bit further on in this
chapter.</para></warning>

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</sect2>

<sect2><title>&nbsp;</title><para>&nbsp;</para>
<para>The details on this package are found in <xref linkend="contents-binutils"/>.</para>
<para>&nbsp;</para></sect2>

</sect1>