[673b0d8] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[b06ca36] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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[673b0d8] | 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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[1f7ca93] | 7 |
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[9652249] | 8 | <sect1 id="ch-tools-gcc-pass2" role="wrap">
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[1f7ca93] | 9 | <?dbhtml filename="gcc-pass2.html"?>
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| 10 |
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[e747759] | 11 | <sect1info condition="script">
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| 12 | <productname>gcc</productname>
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| 13 | <productnumber>&gcc-version;</productnumber>
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| 14 | <address>&gcc-url;</address>
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| 15 | </sect1info>
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| 16 |
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[1f7ca93] | 17 | <title>GCC-&gcc-version; - Pass 2</title>
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| 18 |
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| 19 | <indexterm zone="ch-tools-gcc-pass2">
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| 20 | <primary sortas="a-GCC">GCC</primary>
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| 21 | <secondary>tools, pass 2</secondary>
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| 22 | </indexterm>
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| 23 |
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| 24 | <sect2 role="package">
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| 25 | <title/>
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[bc82645e] | 26 |
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[1f7ca93] | 27 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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| 28 | href="../chapter06/gcc.xml"
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| 29 | xpointer="xpointer(/sect1/sect2[1]/para[1])"/>
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[81fd230] | 30 |
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[1f7ca93] | 31 | <segmentedlist>
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| 32 | <segtitle>&buildtime;</segtitle>
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| 33 | <segtitle>&diskspace;</segtitle>
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[73aedd1d] | 34 |
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[1f7ca93] | 35 | <seglistitem>
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[e4a5635] | 36 | <seg>&gcc-ch5p2-sbu;</seg>
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| 37 | <seg>&gcc-ch5p2-du;</seg>
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[1f7ca93] | 38 | </seglistitem>
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| 39 | </segmentedlist>
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[73aedd1d] | 40 |
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[1f7ca93] | 41 | </sect2>
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[9652249] | 42 |
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[1f7ca93] | 43 | <sect2 role="installation">
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| 44 | <title>Re-installation of GCC</title>
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[73aedd1d] | 45 |
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[1f7ca93] | 46 | <para>The tools required to test GCC and Binutils—Tcl, Expect
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| 47 | and DejaGNU—are installed now. GCC and Binutils can now be
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| 48 | rebuilt, linking them against the new Glibc and testing them properly
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| 49 | (if running the test suites in this chapter). Please note that these
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| 50 | test suites are highly dependent on properly functioning PTYs which
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| 51 | are provided by the host. PTYs are most commonly implemented via the
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| 52 | <systemitem class="filesystem">devpts</systemitem> file system. Check
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| 53 | to see if the host system is set up correctly in this regard by
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| 54 | performing a quick test:</para>
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[73aedd1d] | 55 |
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[0445a3d] | 56 | <screen><userinput remap="test">expect -c "spawn ls"</userinput></screen>
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[73aedd1d] | 57 |
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[1f7ca93] | 58 | <para>The response might be:</para>
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[81fd230] | 59 |
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[1f7ca93] | 60 | <screen><computeroutput>The system has no more ptys.
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[81fd230] | 61 | Ask your system administrator to create more.</computeroutput></screen>
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| 62 |
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[1f7ca93] | 63 | <para>If the above message is received, the host does not have its PTYs
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| 64 | set up properly. In this case, there is no point in running the test
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| 65 | suites for GCC and Binutils until this issue is resolved. Please consult
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| 66 | the LFS FAQ at <ulink url="&lfs-root;/lfs/faq.html#no-ptys"/> for more
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| 67 | information on how to get PTYs working.</para>
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| 68 |
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| 69 | <para>As previously explained in <xref linkend="ch-tools-adjusting"/>,
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| 70 | under normal circumstances the GCC <command>fixincludes</command> script
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| 71 | is run in order to fix potentially broken header files. As GCC-&gcc-version;
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| 72 | and Glibc-&glibc-version; have already been installed at this point, and
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| 73 | their respective header files are known to not require fixing, the
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| 74 | <command>fixincludes</command> script is not required. As mentioned
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| 75 | previously, the script may in fact pollute the build environment by
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| 76 | installing fixed headers from the host system into GCC's private include
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| 77 | directory. The running of the <command>fixincludes</command> script can
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| 78 | be suppressed by issuing the following commands:</para>
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[2e02c35] | 79 |
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[0445a3d] | 80 | <screen><userinput remap="pre">cp -v gcc/Makefile.in{,.orig}
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[27ced84] | 81 | sed 's@\./fixinc\.sh@-c true@' gcc/Makefile.in.orig > gcc/Makefile.in</userinput></screen>
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[2e02c35] | 82 |
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[1f7ca93] | 83 | <para>The bootstrap build performed in <xref linkend="ch-tools-gcc-pass1"/>
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| 84 | built GCC with the <option>-fomit-frame-pointer</option> compiler flag.
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| 85 | Non-bootstrap builds omit this flag by default, so apply the following
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| 86 | <command>sed</command> to use it in order to ensure consistent compiler
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[f19e766] | 87 | builds:</para>
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[2e02c35] | 88 |
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[0445a3d] | 89 | <screen><userinput remap="pre">cp -v gcc/Makefile.in{,.tmp}
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[2e02c35] | 90 | sed 's/^XCFLAGS =$/& -fomit-frame-pointer/' gcc/Makefile.in.tmp \
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[1f7ca93] | 91 | > gcc/Makefile.in</userinput></screen>
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[2e02c35] | 92 |
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[b0a4c9a] | 93 | <para>The following command will change the location of GCC's default
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| 94 | dynamic linker to use the one we installed in
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| 95 | <filename class="directory">/tools</filename>. It also removes <filename
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[1f7ca93] | 96 | class="directory">/usr/include</filename> from GCC's include search path.
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[b0a4c9a] | 97 | Doing this now rather than adjusting the specs file after installation
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[1f7ca93] | 98 | ensures that the new dynamic linker is used during the actual build of
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| 99 | GCC. That is, all of the binaries created during the build will link
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[b0a4c9a] | 100 | against the new Glibc. Issue:</para>
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| 101 |
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[0445a3d] | 102 | <screen><userinput remap="pre">for file in $(find gcc/config -name linux64.h -o -name linux.h)
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[b0a4c9a] | 103 | do
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| 104 | cp -uv $file{,.orig}
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| 105 | sed -e 's@/lib\(64\)\?\(32\)\?/ld@/tools&@g' \
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| 106 | -e 's@/usr@/tools@g' $file.orig > $file
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| 107 | echo "
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| 108 | #undef STANDARD_INCLUDE_DIR
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| 109 | #define STANDARD_INCLUDE_DIR 0" >> $file
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| 110 | touch $file.orig
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| 111 | done</userinput></screen>
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| 112 |
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| 113 | <para>In case the above seems hard to follow, let's break it down a bit.
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| 114 | First we find all the files under the gcc/config directory that are named
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| 115 | either <filename>linux.h</filename> or <filename>linux64.h</filename>.
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| 116 | For each file found, we copy it to a file of the same name but with an added
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| 117 | suffix of <quote>.orig</quote>. Then the first sed expression prepends
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| 118 | <quote>/tools</quote> to every instance of <quote>/lib/ld</quote>,
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| 119 | <quote>/lib64/ld</quote> or <quote>/lib32/ld</quote>, while the second one
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| 120 | replaces hard-coded instances of <quote>/usr</quote>. Then we add our define
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| 121 | statements which alter the include search path to the end of the file. Finally,
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| 122 | we use <command>touch</command> to update the timestamp on the copied files.
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| 123 | When used in conjunction with <command>cp -u</command>, this prevents unexpected
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| 124 | changes to the original files in case the command is inadvertently run twice.
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| 125 | </para>
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[81fd230] | 126 |
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[1f7ca93] | 127 | <para>Create a separate build directory again:</para>
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[73aedd1d] | 128 |
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[0445a3d] | 129 | <screen><userinput remap="pre">mkdir -v ../gcc-build
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[73aedd1d] | 130 | cd ../gcc-build</userinput></screen>
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| 131 |
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[1f7ca93] | 132 | <para>Before starting to build GCC, remember to unset any environment
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| 133 | variables that override the default optimization flags.</para>
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[81fd230] | 134 |
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[1f7ca93] | 135 | <para>Now prepare GCC for compilation:</para>
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[73aedd1d] | 136 |
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[0445a3d] | 137 | <screen><userinput remap="configure">../gcc-&gcc-version;/configure --prefix=/tools \
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[f684ec6c] | 138 | --with-local-prefix=/tools --enable-clocale=gnu \
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| 139 | --enable-shared --enable-threads=posix \
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| 140 | --enable-__cxa_atexit --enable-languages=c,c++ \
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[b0a4c9a] | 141 | --disable-libstdcxx-pch --disable-bootstrap</userinput></screen>
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[73aedd1d] | 142 |
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[1f7ca93] | 143 | <variablelist>
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| 144 | <title>The meaning of the new configure options:</title>
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| 145 |
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| 146 | <varlistentry>
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| 147 | <term><parameter>--enable-clocale=gnu</parameter></term>
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| 148 | <listitem>
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| 149 | <para>This option ensures the correct locale model is selected
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| 150 | for the C++ libraries under all circumstances. If the configure
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| 151 | script finds the <emphasis>de_DE</emphasis> locale installed,
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| 152 | it will select the correct gnu locale model. However, if the
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| 153 | <emphasis>de_DE</emphasis> locale is not installed, there is the
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| 154 | risk of building Application Binary Interface (ABI)-incompatible
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| 155 | C++ libraries because the incorrect generic locale model may be
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| 156 | selected.</para>
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| 157 | </listitem>
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| 158 | </varlistentry>
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| 159 |
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| 160 | <varlistentry>
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| 161 | <term><parameter>--enable-threads=posix</parameter></term>
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| 162 | <listitem>
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| 163 | <para>This enables C++ exception handling for multi-threaded code.</para>
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| 164 | </listitem>
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| 165 | </varlistentry>
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| 166 |
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| 167 | <varlistentry>
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| 168 | <term><parameter>--enable-__cxa_atexit</parameter></term>
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| 169 | <listitem>
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| 170 | <para>This option allows use of <function>__cxa_atexit</function>,
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| 171 | rather than <function>atexit</function>, to register C++ destructors
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| 172 | for local statics and global objects. This option is essential for
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| 173 | fully standards-compliant handling of destructors. It also affects
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| 174 | the C++ ABI, and therefore results in C++ shared libraries and C++
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| 175 | programs that are interoperable with other Linux distributions.</para>
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| 176 | </listitem>
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| 177 | </varlistentry>
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| 178 |
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| 179 | <varlistentry>
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| 180 | <term><parameter>--enable-languages=c,c++</parameter></term>
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| 181 | <listitem>
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| 182 | <para>This option ensures that both the C and C++ compilers are
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| 183 | built.</para>
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| 184 | </listitem>
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| 185 | </varlistentry>
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| 186 |
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| 187 | <varlistentry>
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| 188 | <term><parameter>--disable-libstdcxx-pch</parameter></term>
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| 189 | <listitem>
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| 190 | <para>Do not build the pre-compiled header (PCH) for
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| 191 | <filename class="libraryfile">libstdc++</filename>. It takes up a
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| 192 | lot of space, and we have no use for it.</para>
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| 193 | </listitem>
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| 194 | </varlistentry>
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| 195 |
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[b0a4c9a] | 196 | <varlistentry>
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| 197 | <term><parameter>--disable-bootstrap</parameter></term>
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| 198 | <listitem>
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| 199 | <para>Bootstrapping the compiler is now the default for GCC. However,
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| 200 | our build method should provide us with a solid compiler without the
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| 201 | need to bootstrap each time.</para>
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| 202 | </listitem>
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| 203 | </varlistentry>
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| 204 |
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[1f7ca93] | 205 | </variablelist>
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| 206 |
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| 207 | <para>Compile the package:</para>
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[73aedd1d] | 208 |
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[0445a3d] | 209 | <screen><userinput remap="make">make</userinput></screen>
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[73aedd1d] | 210 |
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[1f7ca93] | 211 | <para>There is no need to use the <parameter>bootstrap</parameter> target
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| 212 | now because the compiler being used to compile this GCC was built from
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| 213 | the exact same version of the GCC sources used earlier.</para>
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[81fd230] | 214 |
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[1f7ca93] | 215 | <para>Compilation is now complete. As previously mentioned, running the test
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| 216 | suites for the temporary tools compiled in this chapter is not mandatory.
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| 217 | To run the GCC test suite anyway, use the following command:</para>
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[3d36131c] | 218 |
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[0445a3d] | 219 | <screen><userinput remap="test">make -k check</userinput></screen>
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[73aedd1d] | 220 |
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[1f7ca93] | 221 | <para>The <parameter>-k</parameter> flag is used to make the test suite run
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| 222 | through to completion and not stop at the first failure. The GCC test
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| 223 | suite is very comprehensive and is almost guaranteed to generate a few
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[9278974d] | 224 | failures.</para>
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[1f7ca93] | 225 |
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[9278974d] | 226 | <para>For a discussion of test failures that are of particular
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| 227 | importance, please see <xref linkend="ch-system-gcc" role="."/></para>
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[ede9b9b] | 228 |
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[1f7ca93] | 229 | <para>Install the package:</para>
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[73aedd1d] | 230 |
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[0445a3d] | 231 | <screen><userinput remap="install">make install</userinput></screen>
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[73aedd1d] | 232 |
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[9278974d] | 233 | <xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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| 234 | href="adjusting.xml"
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| 235 | xpointer="xpointer(/sect1/caution[1])"/>
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[73aedd1d] | 236 |
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[1f7ca93] | 237 | </sect2>
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[bc82645e] | 238 |
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[1f7ca93] | 239 | <sect2 role="content">
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| 240 | <title/>
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[81fd230] | 241 |
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[1f7ca93] | 242 | <para>Details on this package are located in
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| 243 | <xref linkend="contents-gcc" role="."/></para>
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[81fd230] | 244 |
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[1f7ca93] | 245 | </sect2>
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| 246 |
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| 247 | </sect1>
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