| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 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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| 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <sect1 id="ch-system-gcc" role="wrap">
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| 9 | <?dbhtml filename="gcc.html"?>
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| 10 |
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| 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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| 17 | <title>GCC-&gcc-version;</title>
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| 18 |
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| 19 | <indexterm zone="ch-system-gcc">
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| 20 | <primary sortas="a-GCC">GCC</primary>
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| 21 | </indexterm>
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| 22 |
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| 23 | <sect2 role="package">
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| 24 | <title/>
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| 25 |
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| 26 | <para>The GCC package contains the GNU compiler collection, which includes
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| 27 | the C and C++ compilers.</para>
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| 28 |
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| 29 | <segmentedlist>
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| 30 | <segtitle>&buildtime;</segtitle>
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| 31 | <segtitle>&diskspace;</segtitle>
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| 32 |
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| 33 | <seglistitem>
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| 34 | <seg>&gcc-fin-sbu;</seg>
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| 35 | <seg>&gcc-fin-du;</seg>
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| 36 | </seglistitem>
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| 37 | </segmentedlist>
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| 38 |
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| 39 | </sect2>
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| 40 |
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| 41 | <sect2 role="installation">
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| 42 | <title>Installation of GCC</title>
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| 43 | <!--
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| 44 | <para>At first, fix an issue breaking
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| 45 | <filename class="libraryfile">libasan.a</filename> building this package
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| 46 | with Glibc-2.34 or later:</para>
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| 47 |
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| 48 | <screen><userinput remap="pre">sed -e '/static.*SIGSTKSZ/d' \
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| 49 | -e 's/return kAltStackSize/return SIGSTKSZ * 4/' \
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| 50 | -i libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp</userinput></screen>
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| 51 | -->
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| 52 | <!--
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| 53 | <para>First fix a problem with the latest version of glibc:</para>
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| 54 |
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| 55 | <screen><userinput remap="pre">patch -Np1 -i ../&gcc-upstream-fixes-patch;</userinput></screen>
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| 56 | -->
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| 57 | <para>If building on x86_64, change the default directory name for 64-bit
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| 58 | libraries to <quote>lib</quote>:</para>
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| 59 |
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| 60 | <screen arch="default"><userinput remap="pre">case $(uname -m) in
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| 61 | x86_64)
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| 62 | sed -e '/m64=/s/lib64/lib/' \
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| 63 | -i.orig gcc/config/i386/t-linux64
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| 64 | ;;
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| 65 | esac</userinput></screen>
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| 66 |
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| 67 | <para arch="ml_32,ml_x32,ml_all">Change the default directory name for 64-bit
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| 68 | libraries to <quote>lib</quote>:</para>
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| 69 |
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| 70 | <screen arch="ml_32,ml_x32,ml_all"><userinput remap="pre">sed -e '/m64=/s/lib64/lib/' \
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| 71 | -e '/m32=/s/m32=.*/m32=..\/lib32$(call if_multiarch,:i386-linux-gnu)/' \
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| 72 | -i.orig gcc/config/i386/t-linux64</userinput></screen>
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| 73 |
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| 74 | <para>The GCC documentation recommends building GCC in a dedicated build directory:</para>
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| 75 |
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| 76 | <screen><userinput remap="pre">mkdir -v build
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| 77 | cd build</userinput></screen>
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| 78 |
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| 79 | <para>Prepare GCC for compilation:</para>
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| 80 |
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| 81 | <screen arch="default"><userinput remap="configure">../configure --prefix=/usr \
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| 82 | LD=ld \
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| 83 | --enable-languages=c,c++ \
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| 84 | --enable-default-pie \
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| 85 | --enable-default-ssp \
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| 86 | --disable-multilib \
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| 87 | --disable-bootstrap \
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| 88 | --with-system-zlib</userinput></screen>
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| 89 | <screen arch="ml_32,ml_x32,ml_all"><userinput remap="configure"
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| 90 | arch="ml_32" >mlist=m64,m32</userinput><userinput remap="configure"
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| 91 | arch="ml_x32">mlist=m64,mx32</userinput><userinput remap="configure"
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| 92 | arch="ml_all">mlist=m64,m32,mx32</userinput>
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| 93 | <userinput remap="configure">../configure --prefix=/usr \
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| 94 | LD=ld \
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| 95 | --enable-languages=c,c++ \
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| 96 | --enable-default-pie \
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| 97 | --enable-default-ssp \
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| 98 | --enable-multilib \
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| 99 | --with-multilib-list=$mlist \
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| 100 | --disable-bootstrap \
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| 101 | --with-system-zlib</userinput></screen>
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| 102 |
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| 103 | <para>Note that for other programming languages there are some prerequisites that
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| 104 | are not yet available. See the
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| 105 | <ulink url="&blfs-book;general/gcc.html">BLFS Book GCC page</ulink>
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| 106 | for instructions on how to build all of GCC's supported languages.</para>
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| 107 |
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| 108 | <variablelist>
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| 109 | <title>The meaning of the new configure parameters:</title>
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| 110 |
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| 111 | <varlistentry>
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| 112 | <term><parameter>LD=ld</parameter></term>
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| 113 | <listitem>
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| 114 | <para>This parameter makes the configure script use the ld installed
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| 115 | by the binutils built earlier in this chapter, rather than
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| 116 | the cross-built version which would otherwise be used.</para>
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| 117 | </listitem>
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| 118 | </varlistentry>
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| 119 |
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| 120 | <varlistentry>
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| 121 | <term><parameter>--with-system-zlib</parameter></term>
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| 122 | <listitem>
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| 123 | <para>This switch tells GCC to link to the system installed copy of
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| 124 | the zlib library, rather than its own internal copy.</para>
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| 125 | </listitem>
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| 126 | </varlistentry>
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| 127 | </variablelist>
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| 128 |
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| 129 | <note>
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| 130 | <anchor id="pie-ssp-info" xreflabel="note on PIE and SSP"/>
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| 131 | <para>
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| 132 | PIE (position-independent executable) is a technique to produce
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| 133 | binary programs that can be loaded anywhere in memory. Without PIE,
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| 134 | the security feature named ASLR (Address Space Layout Randomization)
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| 135 | can be applied for the shared libraries, but not the executable
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| 136 | itself. Enabling PIE allows ASLR for the executables in addition to
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| 137 | the shared libraries, and mitigates some attacks based on fixed
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| 138 | addresses of sensitive code or data in the executables.
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| 139 | </para>
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| 140 | <para>
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| 141 | SSP (Stack Smashing Protection) is a technique to ensure
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| 142 | that the parameter stack is not corrupted. Stack corruption can
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| 143 | for example alter the return address of a subroutine,
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| 144 | which would allow transferring control to some dangerous code
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| 145 | (existing in the program or shared libraries, or injected by the
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| 146 | attacker somehow) instead of the original one.
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| 147 | </para>
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| 148 | </note>
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| 149 |
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| 150 | <para>Compile the package:</para>
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| 151 |
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| 152 | <screen><userinput remap="make">make</userinput></screen>
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| 153 |
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| 154 | <important>
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| 155 | <para>In this section, the test suite for GCC is considered
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| 156 | important, but it takes a long time. First time builders are
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| 157 | encouraged to not skip it. The time to run the tests can be
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| 158 | reduced significantly by adding -jx to the make command below
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| 159 | where x is the number of cores on your system.</para>
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| 160 | </important>
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| 161 |
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| 162 | <para>One set of tests in the GCC test suite is known to exhaust the default
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| 163 | stack, so increase the stack size prior to running the tests:</para>
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| 164 |
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| 165 | <screen><userinput remap="test">ulimit -s 32768</userinput></screen>
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| 166 |
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| 167 | <para>Test the results as a non-privileged user, but do not stop at errors:</para>
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| 168 |
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| 169 | <screen><userinput remap="test">chown -Rv tester .
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| 170 | su tester -c "PATH=$PATH make -k check"</userinput></screen>
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| 171 |
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| 172 | <para>To receive a summary of the test suite results, run:</para>
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| 173 |
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| 174 | <screen><userinput remap="test">../contrib/test_summary</userinput></screen>
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| 175 |
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| 176 | <para>For only the summaries, pipe the output through
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| 177 | <userinput>grep -A7 Summ</userinput>.</para>
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| 178 |
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| 179 | <para>Results can be compared with those located at <ulink
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| 180 | url="&test-results;"/> and
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| 181 | <ulink url="https://gcc.gnu.org/ml/gcc-testresults/"/>.</para>
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| 182 |
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| 183 | <para>In gcc, eleven tests, in the i386 test suite are known to FAIL.
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| 184 | It's because the test files do not account for the
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| 185 | <parameter>--enable-default-pie</parameter> option.</para>
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| 186 |
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| 187 | <para>In g++, four tests related to PR100400 are known to be reported
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| 188 | as both XPASS and FAIL. It's because the test file for this known issue
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| 189 | is not well written.</para>
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| 190 |
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| 191 | <para>A few unexpected failures cannot always be avoided. The GCC developers
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| 192 | are usually aware of these issues, but have not resolved them yet.
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| 193 | Unless the test results are vastly different from those at the above URL,
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| 194 | it is safe to continue.</para>
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| 195 |
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| 196 | <!--note><para>
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| 197 | On some combinations of kernel configuration and AMD processors
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| 198 | there may be more than 1100 failures in the gcc.target/i386/mpx
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| 199 | tests (which are designed to test the MPX option on recent
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| 200 | Intel processors). These can safely be ignored on AMD
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| 201 | processors. These tests will also fail on Intel processors if MPX support
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| 202 | is not enabled in the kernel even though it is present on the CPU.
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| 203 | </para></note-->
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| 204 |
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| 205 | <para>Install the package:</para>
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| 206 |
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| 207 | <screen><userinput remap="install">make install</userinput></screen>
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| 208 |
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| 209 | <para>The GCC build directory is owned by <systemitem class="username">
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| 210 | tester</systemitem> now and the ownership of the installed header
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| 211 | directory (and its content) will be incorrect. Change the ownership to
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| 212 | <systemitem class="username">root</systemitem> user and group:</para>
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| 213 |
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| 214 | <screen><userinput remap="install">chown -v -R root:root \
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| 215 | /usr/lib/gcc/$(gcc -dumpmachine)/&gcc-version;/include{,-fixed}</userinput></screen>
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| 216 |
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| 217 | <para>Create a symlink required by the <ulink
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| 218 | url="https://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch03s09.html">FHS</ulink>
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| 219 | for "historical" reasons.</para>
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| 220 |
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| 221 | <screen><userinput remap="install">ln -svr /usr/bin/cpp /usr/lib</userinput></screen>
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| 222 | <!-- already done earlier
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| 223 | <para>Many packages use the name <command>cc</command> to call the C
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| 224 | compiler. To satisfy those packages, create a symlink:</para>
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| 225 |
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| 226 | <screen><userinput remap="install">ln -sv gcc /usr/bin/cc</userinput></screen>
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| 227 | -->
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| 228 | <para>Add a compatibility symlink to enable building programs with
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| 229 | Link Time Optimization (LTO):</para>
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| 230 |
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| 231 | <screen><userinput remap="install">ln -sfv ../../libexec/gcc/$(gcc -dumpmachine)/&gcc-version;/liblto_plugin.so \
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| 232 | /usr/lib/bfd-plugins/</userinput></screen>
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| 233 |
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| 234 | <para>Now that our final toolchain is in place, it is important to again ensure
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| 235 | that compiling and linking will work as expected. We do this by performing
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| 236 | some sanity checks:</para>
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| 237 |
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| 238 | <screen><userinput>echo 'int main(){}' > dummy.c
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| 239 | cc dummy.c -v -Wl,--verbose &> dummy.log
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| 240 | readelf -l a.out | grep ': /lib'</userinput></screen>
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| 241 |
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| 242 | <para>There should be no errors,
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| 243 | and the output of the last command will be (allowing for
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| 244 | platform-specific differences in the dynamic linker name):</para>
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| 245 |
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| 246 | <screen><computeroutput>[Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]</computeroutput></screen>
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| 247 |
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| 248 | <para>Now make sure that we're setup to use the correct start files:</para>
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| 249 |
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| 250 | <screen><userinput>grep -E -o '/usr/lib.*/S?crt[1in].*succeeded' dummy.log</userinput></screen>
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| 251 |
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| 252 | <para>The output of the last command should be:</para>
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| 253 |
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| 254 | <screen><computeroutput>/usr/lib/gcc/x86_64-pc-linux-gnu/&gcc-version;/../../../../lib/Scrt1.o succeeded
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| 255 | /usr/lib/gcc/x86_64-pc-linux-gnu/&gcc-version;/../../../../lib/crti.o succeeded
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| 256 | /usr/lib/gcc/x86_64-pc-linux-gnu/&gcc-version;/../../../../lib/crtn.o succeeded</computeroutput></screen>
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| 257 |
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| 258 | <para>Depending on your machine architecture, the above may differ slightly.
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| 259 | The difference will be the name of the directory
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| 260 | after <filename class="directory">/usr/lib/gcc</filename>. The important
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| 261 | thing to look for here is that <command>gcc</command> has found all three
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| 262 | <filename>crt*.o</filename> files under the
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| 263 | <filename class="directory">/usr/lib</filename> directory.</para>
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| 264 |
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| 265 | <para>Verify that the compiler is searching for the correct header
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| 266 | files:</para>
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| 267 |
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| 268 | <screen><userinput>grep -B4 '^ /usr/include' dummy.log</userinput></screen>
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| 269 |
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| 270 | <para>This command should return the following output:</para>
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| 271 |
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| 272 | <screen><computeroutput>#include <...> search starts here:
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| 273 | /usr/lib/gcc/x86_64-pc-linux-gnu/&gcc-version;/include
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| 274 | /usr/local/include
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| 275 | /usr/lib/gcc/x86_64-pc-linux-gnu/&gcc-version;/include-fixed
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| 276 | /usr/include</computeroutput></screen>
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| 277 |
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| 278 | <para>Again, the directory named after your target triplet may be
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| 279 | different than the above, depending on your system architecture.</para>
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| 280 |
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| 281 | <para>Next, verify that the new linker is being used with the correct search paths:</para>
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| 282 |
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| 283 | <screen><userinput>grep 'SEARCH.*/usr/lib' dummy.log |sed 's|; |\n|g'</userinput></screen>
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| 284 |
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| 285 | <para>References to paths that have components with '-linux-gnu' should
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| 286 | be ignored, but otherwise the output of the last command should be:</para>
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| 287 |
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| 288 | <screen><computeroutput>SEARCH_DIR("/usr/x86_64-pc-linux-gnu/lib64")
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| 289 | SEARCH_DIR("/usr/local/lib64")
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| 290 | SEARCH_DIR("/lib64")
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| 291 | SEARCH_DIR("/usr/lib64")
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| 292 | SEARCH_DIR("/usr/x86_64-pc-linux-gnu/lib")
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| 293 | SEARCH_DIR("/usr/local/lib")
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| 294 | SEARCH_DIR("/lib")
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| 295 | SEARCH_DIR("/usr/lib");</computeroutput></screen>
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| 296 |
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| 297 | <para arch="default">A 32-bit system may see a few different directories. For example, here
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| 298 | is the output from an i686 machine:</para>
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| 299 |
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| 300 | <!-- not using entities here as the dir names has nothing to do with multilib -->
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| 301 | <screen arch="default"><computeroutput>SEARCH_DIR("/usr/i686-pc-linux-gnu/lib32")
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| 302 | SEARCH_DIR("/usr/local/lib32")
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| 303 | SEARCH_DIR("/lib32")
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| 304 | SEARCH_DIR("/usr/lib32")
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| 305 | SEARCH_DIR("/usr/i686-pc-linux-gnu/lib")
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| 306 | SEARCH_DIR("/usr/local/lib")
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| 307 | SEARCH_DIR("/lib")
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| 308 | SEARCH_DIR("/usr/lib");</computeroutput></screen>
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| 309 |
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| 310 | <para>Next make sure that we're using the correct libc:</para>
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| 311 |
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| 312 | <screen><userinput>grep "/lib.*/libc.so.6 " dummy.log</userinput></screen>
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| 313 |
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| 314 | <para>The output of the last command should be:</para>
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| 315 |
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| 316 | <screen><computeroutput>attempt to open /usr/lib/libc.so.6 succeeded</computeroutput></screen>
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| 317 |
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| 318 | <para>Make sure GCC is using the correct dynamic linker:</para>
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| 319 |
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| 320 | <screen><userinput>grep found dummy.log</userinput></screen>
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| 321 |
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| 322 | <para>The output of the last command should be (allowing for
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| 323 | platform-specific differences in dynamic linker name):</para>
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| 324 |
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| 325 | <screen><computeroutput>found ld-linux-x86-64.so.2 at /usr/lib/ld-linux-x86-64.so.2</computeroutput></screen>
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| 326 |
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| 327 | <para>If the output does not appear as shown above or is not received
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| 328 | at all, then something is seriously wrong. Investigate and retrace the
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| 329 | steps to find out where the problem is and correct it. <!--The most likely
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| 330 | reason is that something went wrong with the specs file adjustment.--> Any
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| 331 | issues will need to be resolved before continuing with the process.</para>
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| 332 |
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| 333 | <para>Once everything is working correctly, clean up the test files:</para>
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| 334 |
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| 335 | <screen><userinput>rm -v dummy.c a.out dummy.log</userinput></screen>
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| 336 |
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| 337 | <para>Finally, move a misplaced file:</para>
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| 338 |
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| 339 | <screen><userinput remap="install">mkdir -pv /usr/share/gdb/auto-load/usr/lib
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| 340 | mv -v /usr/lib/*gdb.py /usr/share/gdb/auto-load/usr/lib</userinput></screen>
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| 341 |
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| 342 | </sect2>
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| 343 |
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| 344 | <sect2 id="contents-gcc" role="content">
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| 345 | <title>Contents of GCC</title>
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| 346 |
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| 347 | <segmentedlist>
|
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| 348 | <segtitle>Installed programs</segtitle>
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| 349 | <segtitle>Installed libraries</segtitle>
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| 350 | <segtitle>Installed directories</segtitle>
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| 351 |
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| 352 | <seglistitem>
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| 353 | <seg>c++, cc (link to gcc), cpp, g++, gcc,
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| 354 | gcc-ar, gcc-nm, gcc-ranlib, gcov, gcov-dump, gcov-tool,
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| 355 | and lto-dump</seg>
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| 356 |
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| 357 | <seg>libasan.{a,so}, libatomic.{a,so}, libcc1.so, libgcc.a, libgcc_eh.a,
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| 358 | libgcc_s.so, libgcov.a, libgomp.{a,so}, libitm.{a,so},
|
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| 359 | liblsan.{a,so}, liblto_plugin.so,
|
|---|
| 360 | libquadmath.{a,so}, libssp.{a,so}, libssp_nonshared.a,
|
|---|
| 361 | libstdc++.{a,so}, libstdc++fs.a, libsupc++.a, libtsan.{a,so},
|
|---|
| 362 | and libubsan.{a,so}</seg>
|
|---|
| 363 |
|
|---|
| 364 | <seg>/usr/include/c++, /usr/lib/gcc, /usr/libexec/gcc, and
|
|---|
| 365 | /usr/share/gcc-&gcc-version;</seg>
|
|---|
| 366 | </seglistitem>
|
|---|
| 367 | </segmentedlist>
|
|---|
| 368 |
|
|---|
| 369 | <variablelist>
|
|---|
| 370 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
|
|---|
| 371 | <?dbfo list-presentation="list"?>
|
|---|
| 372 | <?dbhtml list-presentation="table"?>
|
|---|
| 373 |
|
|---|
| 374 | <varlistentry id="c">
|
|---|
| 375 | <term><command>c++</command></term>
|
|---|
| 376 | <listitem>
|
|---|
| 377 | <para>The C++ compiler</para>
|
|---|
| 378 | <indexterm zone="ch-system-gcc c">
|
|---|
| 379 | <primary sortas="b-c++">c++</primary>
|
|---|
| 380 | </indexterm>
|
|---|
| 381 | </listitem>
|
|---|
| 382 | </varlistentry>
|
|---|
| 383 |
|
|---|
| 384 | <varlistentry id="cc">
|
|---|
| 385 | <term><command>cc</command></term>
|
|---|
| 386 | <listitem>
|
|---|
| 387 | <para>The C compiler</para>
|
|---|
| 388 | <indexterm zone="ch-system-gcc cc">
|
|---|
| 389 | <primary sortas="b-cc">cc</primary>
|
|---|
| 390 | </indexterm>
|
|---|
| 391 | </listitem>
|
|---|
| 392 | </varlistentry>
|
|---|
| 393 |
|
|---|
| 394 | <varlistentry id="cpp">
|
|---|
| 395 | <term><command>cpp</command></term>
|
|---|
| 396 | <listitem>
|
|---|
| 397 | <para>The C preprocessor; it is used by the compiler to expand the
|
|---|
| 398 | #include, #define, and similar statements in the source files</para>
|
|---|
| 399 | <indexterm zone="ch-system-gcc cpp">
|
|---|
| 400 | <primary sortas="b-cpp">cpp</primary>
|
|---|
| 401 | </indexterm>
|
|---|
| 402 | </listitem>
|
|---|
| 403 | </varlistentry>
|
|---|
| 404 |
|
|---|
| 405 | <varlistentry id="g">
|
|---|
| 406 | <term><command>g++</command></term>
|
|---|
| 407 | <listitem>
|
|---|
| 408 | <para>The C++ compiler</para>
|
|---|
| 409 | <indexterm zone="ch-system-gcc g">
|
|---|
| 410 | <primary sortas="b-g++">g++</primary>
|
|---|
| 411 | </indexterm>
|
|---|
| 412 | </listitem>
|
|---|
| 413 | </varlistentry>
|
|---|
| 414 |
|
|---|
| 415 | <varlistentry id="gcc">
|
|---|
| 416 | <term><command>gcc</command></term>
|
|---|
| 417 | <listitem>
|
|---|
| 418 | <para>The C compiler</para>
|
|---|
| 419 | <indexterm zone="ch-system-gcc gcc">
|
|---|
| 420 | <primary sortas="b-gcc">gcc</primary>
|
|---|
| 421 | </indexterm>
|
|---|
| 422 | </listitem>
|
|---|
| 423 | </varlistentry>
|
|---|
| 424 |
|
|---|
| 425 | <varlistentry id="gcc-ar">
|
|---|
| 426 | <term><command>gcc-ar</command></term>
|
|---|
| 427 | <listitem>
|
|---|
| 428 | <para>A wrapper around <command>ar</command> that adds a
|
|---|
| 429 | plugin to the command line. This program is only used
|
|---|
| 430 | to add "link time optimization" and is not useful with the
|
|---|
| 431 | default build options</para>
|
|---|
| 432 | <indexterm zone="ch-system-gcc gcc-ar">
|
|---|
| 433 | <primary sortas="b-gcc-ar">gc-ar</primary>
|
|---|
| 434 | </indexterm>
|
|---|
| 435 | </listitem>
|
|---|
| 436 | </varlistentry>
|
|---|
| 437 |
|
|---|
| 438 | <varlistentry id="gcc-nm">
|
|---|
| 439 | <term><command>gcc-nm</command></term>
|
|---|
| 440 | <listitem>
|
|---|
| 441 | <para>A wrapper around <command>nm</command> that adds a
|
|---|
| 442 | plugin to the command line. This program is only used
|
|---|
| 443 | to add "link time optimization" and is not useful with the
|
|---|
| 444 | default build options</para>
|
|---|
| 445 | <indexterm zone="ch-system-gcc gcc-nm">
|
|---|
| 446 | <primary sortas="b-gcc-nm">gc-nm</primary>
|
|---|
| 447 | </indexterm>
|
|---|
| 448 | </listitem>
|
|---|
| 449 | </varlistentry>
|
|---|
| 450 |
|
|---|
| 451 | <varlistentry id="gcc-ranlib">
|
|---|
| 452 | <term><command>gcc-ranlib</command></term>
|
|---|
| 453 | <listitem>
|
|---|
| 454 | <para>A wrapper around <command>ranlib</command> that adds a
|
|---|
| 455 | plugin to the command line. This program is only used
|
|---|
| 456 | to add "link time optimization" and is not useful with the
|
|---|
| 457 | default build options</para>
|
|---|
| 458 | <indexterm zone="ch-system-gcc gcc-ranlib">
|
|---|
| 459 | <primary sortas="b-gcc-ranlib">gc-ranlib</primary>
|
|---|
| 460 | </indexterm>
|
|---|
| 461 | </listitem>
|
|---|
| 462 | </varlistentry>
|
|---|
| 463 |
|
|---|
| 464 | <varlistentry id="gcov">
|
|---|
| 465 | <term><command>gcov</command></term>
|
|---|
| 466 | <listitem>
|
|---|
| 467 | <para>A coverage testing tool; it is used to analyze programs to
|
|---|
| 468 | determine where optimizations will have the most effect</para>
|
|---|
| 469 | <indexterm zone="ch-system-gcc gcov">
|
|---|
| 470 | <primary sortas="b-gcov">gcov</primary>
|
|---|
| 471 | </indexterm>
|
|---|
| 472 | </listitem>
|
|---|
| 473 | </varlistentry>
|
|---|
| 474 |
|
|---|
| 475 | <varlistentry id="gcov-dump">
|
|---|
| 476 | <term><command>gcov-dump</command></term>
|
|---|
| 477 | <listitem>
|
|---|
| 478 | <para>Offline gcda and gcno profile dump tool</para>
|
|---|
| 479 | <indexterm zone="ch-system-gcc gcov-dump">
|
|---|
| 480 | <primary sortas="b-gcov-dump">gcov-dump</primary>
|
|---|
| 481 | </indexterm>
|
|---|
| 482 | </listitem>
|
|---|
| 483 | </varlistentry>
|
|---|
| 484 |
|
|---|
| 485 | <varlistentry id="gcov-tool">
|
|---|
| 486 | <term><command>gcov-tool</command></term>
|
|---|
| 487 | <listitem>
|
|---|
| 488 | <para>Offline gcda profile processing tool</para>
|
|---|
| 489 | <indexterm zone="ch-system-gcc gcov-tool">
|
|---|
| 490 | <primary sortas="b-gcov-tool">gcov-tool</primary>
|
|---|
| 491 | </indexterm>
|
|---|
| 492 | </listitem>
|
|---|
| 493 | </varlistentry>
|
|---|
| 494 |
|
|---|
| 495 | <varlistentry id="lto-dump">
|
|---|
| 496 | <term><command>lto-dump</command></term>
|
|---|
| 497 | <listitem>
|
|---|
| 498 | <para>Tool for dumping object files produced by GCC with LTO
|
|---|
| 499 | enabled</para>
|
|---|
| 500 | <indexterm zone="ch-system-gcc lto-dump">
|
|---|
| 501 | <primary sortas="b-lto-dump">lto-dump</primary>
|
|---|
| 502 | </indexterm>
|
|---|
| 503 | </listitem>
|
|---|
| 504 | </varlistentry>
|
|---|
| 505 |
|
|---|
| 506 | <varlistentry id="libasan">
|
|---|
| 507 | <term><filename class="libraryfile">libasan</filename></term>
|
|---|
| 508 | <listitem>
|
|---|
| 509 | <para>The Address Sanitizer runtime library</para>
|
|---|
| 510 | <indexterm zone="ch-system-gcc libasan">
|
|---|
| 511 | <primary sortas="b-libasan">libasan</primary>
|
|---|
| 512 | </indexterm>
|
|---|
| 513 | </listitem>
|
|---|
| 514 | </varlistentry>
|
|---|
| 515 |
|
|---|
| 516 | <varlistentry id="libatomic">
|
|---|
| 517 | <term><filename class="libraryfile">libatomic</filename></term>
|
|---|
| 518 | <listitem>
|
|---|
| 519 | <para>GCC atomic built-in runtime library</para>
|
|---|
| 520 | <indexterm zone="ch-system-gcc libatomic">
|
|---|
| 521 | <primary sortas="b-libatomic">libatomic</primary>
|
|---|
| 522 | </indexterm>
|
|---|
| 523 | </listitem>
|
|---|
| 524 | </varlistentry>
|
|---|
| 525 |
|
|---|
| 526 | <varlistentry id="libcc1">
|
|---|
| 527 | <term><filename class="libraryfile">libcc1</filename></term>
|
|---|
| 528 | <listitem>
|
|---|
| 529 | <para>The C preprocessing library</para>
|
|---|
| 530 | <indexterm zone="ch-system-gcc libcc1">
|
|---|
| 531 | <primary sortas="b-libcc1">libcc1</primary>
|
|---|
| 532 | </indexterm>
|
|---|
| 533 | </listitem>
|
|---|
| 534 | </varlistentry>
|
|---|
| 535 |
|
|---|
| 536 | <varlistentry id="libgcc">
|
|---|
| 537 | <term><filename class="libraryfile">libgcc</filename></term>
|
|---|
| 538 | <listitem>
|
|---|
| 539 | <para>Contains run-time support for <command>gcc</command></para>
|
|---|
| 540 | <indexterm zone="ch-system-gcc libgcc">
|
|---|
| 541 | <primary sortas="c-libgcc">libgcc</primary>
|
|---|
| 542 | </indexterm>
|
|---|
| 543 | </listitem>
|
|---|
| 544 | </varlistentry>
|
|---|
| 545 |
|
|---|
| 546 | <varlistentry id="libgcov">
|
|---|
| 547 | <term><filename class="libraryfile">libgcov</filename></term>
|
|---|
| 548 | <listitem>
|
|---|
| 549 | <para>This library is linked in to a program when GCC is instructed
|
|---|
| 550 | to enable profiling</para>
|
|---|
| 551 | <indexterm zone="ch-system-gcc libgcov">
|
|---|
| 552 | <primary sortas="c-libgcov">libgcov</primary>
|
|---|
| 553 | </indexterm>
|
|---|
| 554 | </listitem>
|
|---|
| 555 | </varlistentry>
|
|---|
| 556 |
|
|---|
| 557 | <varlistentry id="libgomp">
|
|---|
| 558 | <term><filename class="libraryfile">libgomp</filename></term>
|
|---|
| 559 | <listitem>
|
|---|
| 560 | <para>GNU implementation of the OpenMP API for multi-platform
|
|---|
| 561 | shared-memory parallel programming in C/C++ and Fortran</para>
|
|---|
| 562 | <indexterm zone="ch-system-gcc libgomp">
|
|---|
| 563 | <primary sortas="c-libgomp">libgomp</primary>
|
|---|
| 564 | </indexterm>
|
|---|
| 565 | </listitem>
|
|---|
| 566 | </varlistentry>
|
|---|
| 567 |
|
|---|
| 568 | <varlistentry id="libitm">
|
|---|
| 569 | <term><filename class="libraryfile">libitm</filename></term>
|
|---|
| 570 | <listitem>
|
|---|
| 571 | <para>The GNU transactional memory library</para>
|
|---|
| 572 | <indexterm zone="ch-system-gcc libitm">
|
|---|
| 573 | <primary sortas="c-libitm">libitm</primary>
|
|---|
| 574 | </indexterm>
|
|---|
| 575 | </listitem>
|
|---|
| 576 | </varlistentry>
|
|---|
| 577 |
|
|---|
| 578 | <varlistentry id="liblsan">
|
|---|
| 579 | <term><filename class="libraryfile">liblsan</filename></term>
|
|---|
| 580 | <listitem>
|
|---|
| 581 | <para>The Leak Sanitizer runtime library</para>
|
|---|
| 582 | <indexterm zone="ch-system-gcc liblsan">
|
|---|
| 583 | <primary sortas="c-liblsan">liblsan</primary>
|
|---|
| 584 | </indexterm>
|
|---|
| 585 | </listitem>
|
|---|
| 586 | </varlistentry>
|
|---|
| 587 |
|
|---|
| 588 | <varlistentry id="liblto_plugin">
|
|---|
| 589 | <term><filename class="libraryfile">liblto_plugin</filename></term>
|
|---|
| 590 | <listitem>
|
|---|
| 591 | <para>GCC's LTO plugin allows binutils to process object files
|
|---|
| 592 | produced by GCC with LTO enabled</para>
|
|---|
| 593 | <indexterm zone="ch-system-gcc liblto_plugin">
|
|---|
| 594 | <primary sortas="c-liblto_plugin">liblto_plugin</primary>
|
|---|
| 595 | </indexterm>
|
|---|
| 596 | </listitem>
|
|---|
| 597 | </varlistentry>
|
|---|
| 598 |
|
|---|
| 599 | <varlistentry id="libquadmath">
|
|---|
| 600 | <term><filename class="libraryfile">libquadmath</filename></term>
|
|---|
| 601 | <listitem>
|
|---|
| 602 | <para>GCC Quad Precision Math Library API</para>
|
|---|
| 603 | <indexterm zone="ch-system-gcc libquadmath">
|
|---|
| 604 | <primary sortas="c-libquadmath">libquadmath</primary>
|
|---|
| 605 | </indexterm>
|
|---|
| 606 | </listitem>
|
|---|
| 607 | </varlistentry>
|
|---|
| 608 |
|
|---|
| 609 | <varlistentry id="libssp">
|
|---|
| 610 | <term><filename class="libraryfile">libssp</filename></term>
|
|---|
| 611 | <listitem>
|
|---|
| 612 | <para>Contains routines supporting GCC's stack-smashing protection
|
|---|
| 613 | functionality. Normally it's unused because glibc also provides
|
|---|
| 614 | those routines</para>
|
|---|
| 615 | <indexterm zone="ch-system-gcc libssp">
|
|---|
| 616 | <primary sortas="c-libssp">libssp</primary>
|
|---|
| 617 | </indexterm>
|
|---|
| 618 | </listitem>
|
|---|
| 619 | </varlistentry>
|
|---|
| 620 |
|
|---|
| 621 | <varlistentry id="libstdc">
|
|---|
| 622 | <term><filename class="libraryfile">libstdc++</filename></term>
|
|---|
| 623 | <listitem>
|
|---|
| 624 | <para>The standard C++ library</para>
|
|---|
| 625 | <indexterm zone="ch-system-gcc libstdc">
|
|---|
| 626 | <primary sortas="c-libstdc++">libstdc++</primary>
|
|---|
| 627 | </indexterm>
|
|---|
| 628 | </listitem>
|
|---|
| 629 | </varlistentry>
|
|---|
| 630 |
|
|---|
| 631 | <varlistentry id="libstdcfs">
|
|---|
| 632 | <term><filename class="libraryfile">libstdc++fs</filename></term>
|
|---|
| 633 | <listitem>
|
|---|
| 634 | <para>ISO/IEC TS 18822:2015 Filesystem library</para>
|
|---|
| 635 | <indexterm zone="ch-system-gcc libstdcfs">
|
|---|
| 636 | <primary sortas="c-libstdc++fs">libstdc++fs</primary>
|
|---|
| 637 | </indexterm>
|
|---|
| 638 | </listitem>
|
|---|
| 639 | </varlistentry>
|
|---|
| 640 |
|
|---|
| 641 | <varlistentry id="libsupc">
|
|---|
| 642 | <term><filename class="libraryfile">libsupc++</filename></term>
|
|---|
| 643 | <listitem>
|
|---|
| 644 | <para>Provides supporting routines for the C++ programming
|
|---|
| 645 | language</para>
|
|---|
| 646 | <indexterm zone="ch-system-gcc libsupc">
|
|---|
| 647 | <primary sortas="c-libsupc++">libsupc++</primary>
|
|---|
| 648 | </indexterm>
|
|---|
| 649 | </listitem>
|
|---|
| 650 | </varlistentry>
|
|---|
| 651 |
|
|---|
| 652 | <varlistentry id="libtsan">
|
|---|
| 653 | <term><filename class="libraryfile">libtsan</filename></term>
|
|---|
| 654 | <listitem>
|
|---|
| 655 | <para>The Thread Sanitizer runtime library</para>
|
|---|
| 656 | <indexterm zone="ch-system-gcc libtsan">
|
|---|
| 657 | <primary sortas="c-libtsan">libtsan</primary>
|
|---|
| 658 | </indexterm>
|
|---|
| 659 | </listitem>
|
|---|
| 660 | </varlistentry>
|
|---|
| 661 |
|
|---|
| 662 | <varlistentry id="libubsan">
|
|---|
| 663 | <term><filename class="libraryfile">libubsan</filename></term>
|
|---|
| 664 | <listitem>
|
|---|
| 665 | <para>The Undefined Behavior Sanitizer runtime library</para>
|
|---|
| 666 | <indexterm zone="ch-system-gcc libubsan">
|
|---|
| 667 | <primary sortas="c-libubsan">libubsan</primary>
|
|---|
| 668 | </indexterm>
|
|---|
| 669 | </listitem>
|
|---|
| 670 | </varlistentry>
|
|---|
| 671 |
|
|---|
| 672 | </variablelist>
|
|---|
| 673 |
|
|---|
| 674 | </sect2>
|
|---|
| 675 |
|
|---|
| 676 | </sect1>
|
|---|
