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).
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8 | Therefore, if you have defined any environment variables that override
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9 | default optimizations, such as CFLAGS and CXXFLAGS, we recommend unsetting
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10 | or modifying them when building GCC.</para>
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11 |
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12 | <para>This time we will build both the C and the C++ compiler, so you'll have
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13 | to unpack the GCC-core <emphasis>and</emphasis> the GCC-g++ tarball -- they
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14 | will unfold into the same directory. You should likewise extract the
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15 | GCC-testsuite package. The full GCC package contains even more
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16 | compilers. Instructions for building these can be found at
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17 | <ulink url="&blfs-root;view/cvs/general/gcc.html"/>.</para>
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18 |
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19 | <para><screen><userinput>patch -Np1 -i ../gcc-&gcc-version;-no_fixincludes-2.patch
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20 | </userinput></screen></para>
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21 |
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22 | <para>GCC's installation documentation recommends to build the package in a
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23 | dedicated directory separate from the source tree. Create this build
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24 | directory and go there:</para>
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25 |
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26 | <para><screen><userinput>mkdir ../gcc-build
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27 | cd ../gcc-build</userinput></screen></para>
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28 |
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29 | <para>Now prepare GCC for compilation:</para>
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30 |
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31 | <para><screen><userinput>../gcc-&gcc-version;/configure --prefix=/usr \
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32 | --enable-shared --enable-threads=posix \
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33 | --enable-__cxa_atexit --enable-clocale=gnu \
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34 | --enable-languages=c,c++</userinput></screen></para>
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35 |
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36 | <para>The meaning of the new configure options:</para>
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37 |
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38 | <itemizedlist>
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39 | <listitem><para><userinput>--enable-threads=posix</userinput>: This enables
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40 | C++ exception handling for multi-threaded code.</para></listitem>
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41 |
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42 | <listitem><para><userinput>--enable-__cxa_atexit</userinput>: This option
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43 | will result in C++ shared libraries and C++ programs that are interoperable
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44 | with other Linux distributions.</para></listitem>
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45 |
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46 | <listitem><para><userinput>--enable-clocale=gnu</userinput>: There is a risk
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47 | that some people will build ABI incompatible C++ libraries if they didn't
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48 | install all of the glibc localedata. Using --enable-clocale=gnu ensures that
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49 | the "right thing" is done in all cases. If you don't wish to use this option,
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50 | then at least build the <emphasis>de_DE</emphasis> locale. When GCC finds
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51 | this specific locale, then the correct locale mode (<emphasis>gnu</emphasis>)
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52 | is implemented.</para></listitem>
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53 | </itemizedlist>
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54 |
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55 | <para>Compile the package:</para>
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56 |
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57 | <para><screen><userinput>make</userinput></screen></para>
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58 |
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59 | <para>Test the results, but don't stop at errors (you'll remember the few
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60 | known ones):</para>
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61 |
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62 | <para><screen><userinput>make -k check</userinput></screen></para>
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63 |
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64 | <para>And install the package:</para>
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65 |
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66 | <para><screen><userinput>make install</userinput></screen></para>
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67 |
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68 | <para>Some packages expect the C PreProcessor to be installed in the
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69 | <filename>/lib</filename> and <filename>/usr/lib</filename> directories.
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70 | To honor those packages, create two symlinks:</para>
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71 |
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72 | <para><screen><userinput>ln -s ../usr/bin/cpp /lib</userinput></screen></para>
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73 |
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74 | <para>Many packages use the name <userinput>cc</userinput> to call the C
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75 | compiler. To satisfy those packages, create a symlink:</para>
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76 |
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77 | <para><screen><userinput>ln -s gcc /usr/bin/cc</userinput></screen></para>
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78 |
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79 | <para>Remove the spurious a-out library again:</para>
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80 |
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81 | <para><screen><userinput>rm /usr/lib/libiberty.a</userinput></screen></para>
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82 |
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83 | </sect2>
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