[7681a57] | 1 | <sect2><title> </title><para> </para></sect2>
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| 2 |
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[6370fa6] | 3 | <sect2>
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[a36091d] | 4 | <title>Installation of GCC</title>
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[6370fa6] | 5 |
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[ab6f1859] | 6 | <para>Unpack only the GCC-core tarball, as we won't be needing a C++ compiler
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| 7 | for the moment.</para>
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[4e010de] | 8 |
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[e69a59f] | 9 | <para>This package is known to behave badly when you have changed its
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[2b114b25] | 10 | default optimization flags (including the -march and -mcpu options).
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| 11 | Therefore, if you have defined any environment variables that override
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| 12 | default optimizations, such as CFLAGS and CXXFLAGS, we recommend unsetting
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| 13 | or modifying them when building GCC.</para>
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[b43aab1] | 14 |
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[7681a57] | 15 | <para>It is recommended by the GCC installation documentation to build
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| 16 | GCC outside of the source directory in a dedicated directory:</para>
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| 17 |
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| 18 | <para><screen><userinput>mkdir ../gcc-build
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| 19 | cd ../gcc-build</userinput></screen></para>
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| 20 |
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| 21 | <para>Prepare GCC to be compiled:</para>
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[6370fa6] | 22 |
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[148bb04] | 23 | <para><screen><userinput>../gcc-&gcc-version;/configure --prefix=/tools \
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| 24 | --with-local-prefix=/tools \
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[0939e573] | 25 | --disable-nls --enable-shared \
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| 26 | --enable-languages=c</userinput></screen></para>
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[7681a57] | 27 |
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[087e584] | 28 | <para>The meaning of the new configure options:</para>
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[7681a57] | 29 |
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| 30 | <itemizedlist>
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[148bb04] | 31 | <listitem><para><userinput>--with-local-prefix=/tools</userinput>: The
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[66e4325] | 32 | purpose of this switch is to remove <filename>/usr/local/include</filename>
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| 33 | from <userinput>gcc</userinput>'s include search path. This is not absolutely
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| 34 | essential, but we want to try and minimize the influence from the host system,
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| 35 | so this seems a logical thing to do.</para></listitem>
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| 36 |
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| 37 | <listitem><para><userinput>--enable-shared</userinput>: This switch may
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| 38 | seem counter-intuitive at first. But using it allows the building of
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| 39 | <filename>libgcc_s.so.1</filename> and <filename>libgcc_eh.a</filename>, and
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| 40 | having <filename>libgcc_eh.a</filename> available ensures that the configure
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| 41 | script for Glibc (the next package we compile) produces the proper results.
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[ab6f1859] | 42 | Note that the <userinput>gcc</userinput> binaries will still be linked
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[66e4325] | 43 | statically, as this is controlled by the <userinput>-static</userinput>
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| 44 | value of BOOT_LDFLAGS further on.</para></listitem>
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| 45 |
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[ab6f1859] | 46 | <listitem><para><userinput>--enable-languages=c</userinput>: This option
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| 47 | ensures that only the C compiler is built. The option is only needed when you
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| 48 | have downloaded and unpacked the full GCC tarball.</para></listitem>
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[7681a57] | 49 | </itemizedlist>
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| 50 |
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| 51 | <para>Continue with compiling the package:</para>
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| 52 |
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[84a7dc2] | 53 | <para><screen><userinput>make BOOT_LDFLAGS="-static" bootstrap</userinput></screen></para>
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[7681a57] | 54 |
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[087e584] | 55 | <para>The meaning of the make parameters:</para>
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[7681a57] | 56 |
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| 57 | <itemizedlist>
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[66e4325] | 58 | <listitem><para><userinput>BOOT_LDFLAGS="-static"</userinput>: This tells
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| 59 | GCC to link its programs statically.</para></listitem>
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| 60 |
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| 61 | <listitem><para><userinput>bootstrap</userinput>: This target doesn't just
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| 62 | compile GCC, but compiles it several times. It uses the programs compiled in
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| 63 | a first round to compile itself a second time, and then again a third time.
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| 64 | It then compares these second and third compiles to make sure it can
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| 65 | reproduce itself flawlessly, which most probably means that it was
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| 66 | compiled correctly.</para></listitem>
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[7681a57] | 67 | </itemizedlist>
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| 68 |
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[66e4325] | 69 | <para>And install the package:</para>
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[7681a57] | 70 |
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[bc82645e] | 71 | <para><screen><userinput>make install</userinput></screen></para>
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[7681a57] | 72 |
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[66e4325] | 73 | <para>As a finishing touch we'll create the <filename
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[148bb04] | 74 | class="symlink">/tools/bin/cc</filename> symlink. Many programs and
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[66e4325] | 75 | scripts run <userinput>cc</userinput> instead of <userinput>gcc</userinput>,
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| 76 | a thing meant to keep programs generic and therefore usable on all kinds of
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| 77 | Unix systems. Not everybody has the GNU C compiler installed. Simply running
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| 78 | <userinput>cc</userinput> leaves the system administrator free to decide what
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| 79 | C compiler to install, as long as there's a symlink pointing to it:</para>
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[7681a57] | 80 |
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[148bb04] | 81 | <para><screen><userinput>ln -sf gcc /tools/bin/cc</userinput></screen></para>
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[6370fa6] | 82 |
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| 83 | </sect2>
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| 84 |
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