1 | <sect2><title> </title><para> </para></sect2>
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2 |
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3 | <sect2>
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4 | <title>Installation of GCC</title>
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5 |
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6 | <para>This package is known to behave badly when you have changed its
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7 | default optimization flags (including the -march and -mcpu options). GCC is
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8 | best left alone. Therefore, if you have defined any environment variables
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9 | that override default optimizations, such as CFLAGS and CXXFLAGS, we
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10 | recommend unsetting or modifying them when building GCC. You have
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11 | been warned.</para>
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12 |
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13 | <para>We will be building the C and C++ compilers at this time, so you'll
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14 | need to unpack both the gcc-core and gcc-g++ tarballs. Other compilers are
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15 | available in the full gcc package; instructions for building them may be
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16 | found at <ulink url="&blfs-root;view/cvs/general/gcc.html"/>.</para>
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17 |
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18 | <para>It is recommended by the GCC installation documentation to build GCC
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19 | in a dedicated directory outside of the source tree. Create the build
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20 | directory:</para>
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21 |
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22 | <para><screen><userinput>mkdir ../gcc-build &&
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23 | cd ../gcc-build</userinput></screen></para>
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24 |
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25 | <para>Prepare GCC to be compiled:</para>
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26 |
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27 | <para><screen><userinput>../gcc-&gcc-version;/configure --prefix=/usr --enable-shared \
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28 | --enable-threads=posix --with-slibdir=/lib \
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29 | --enable-__cxa_atexit --enable-clocale=gnu</userinput></screen></para>
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30 |
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31 | <para>The meanings of the configure options are:</para>
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32 |
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33 | <itemizedlist>
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34 | <listitem><para><userinput>--enable-threads=posix:</userinput> This enables
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35 | C++ exception handling for multi-threaded code.</para></listitem>
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36 |
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37 | <listitem><para><userinput>--enable-__cxa_atexit:</userinput> This option
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38 | will result in C++ shared libraries and C++ programs that are interoperable
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39 | with other Linux distributions.</para></listitem>
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40 |
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41 | <listitem><para><userinput>--enable-clocale=gnu:</userinput> There is a risk
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42 | that some people will build ABI incompatible C++ libraries if they didn't
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43 | install all of the glibc localedata. Using --enable-clocale=gnu ensures that
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44 | the "right thing" is done in all cases. If you don't wish to use this option,
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45 | then at least build the <emphasis>de_DE</emphasis> locale. When GCC finds
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46 | this specific locale, then the correct locale mode (<emphasis>gnu</emphasis>)
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47 | is implemented.</para></listitem>
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48 | </itemizedlist>
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49 |
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50 | <para>Continue with compiling the package:</para>
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51 |
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52 | <para><screen><userinput>make bootstrap</userinput></screen></para>
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53 |
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54 | <para>The <emphasis>bootstrap</emphasis> target doesn't just compile GCC, but
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55 | it compiles GCC a multiple times. It uses the first compiled programs to
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56 | compile itself a second and third time to make sure the compiler was compiled
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57 | properly.</para>
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58 |
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59 | <para>Finish installing the package:</para>
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60 |
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61 | <para><screen><userinput>make install</userinput></screen></para>
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62 |
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63 | <para>Some packages require that the C++ compiler be installed in the
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64 | <filename>/lib</filename> and <filename>/usr/lib</filename> directories.
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65 | To honor those packages, create two symlinks:</para>
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66 |
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67 | <para><screen><userinput>ln -s ../usr/bin/cpp /lib &&
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68 | ln -s ../bin/cpp /usr/lib</userinput></screen></para>
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69 |
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70 | <para>Many packages compile using <emphasis>cc</emphasis> as the name for
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71 | the C compiler. To satisfy those packages, create a <emphasis>cc</emphasis>
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72 | symlink:</para>
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73 |
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74 | <para><screen><userinput>ln -s gcc /usr/bin/cc</userinput></screen></para>
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75 |
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76 | </sect2>
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