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toolchaintechnotes: reword the explanation about rebuild libstdc++ in gcc pass 2

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Xi Ruoyao 2022-10-31 14:50:35 +08:00
parent decf315c6d
commit 61f825108e
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part3intro/toolchaintechnotes.xml
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@ -253,9 +253,9 @@
degraded), and also to build libstdc++. This last library will lack some of the
functionality of libgcc.</para>
<para>The upshot of the preceding
paragraph is that cc1 is unable to build a fully functional libstdc++, but
this is the only compiler available for building the C/C++ libraries
<para>The upshot of the preceding paragraph is that cc1 is unable to
build a fully functional libstdc++ with the degraded libgcc, but cc1
is the only compiler available for building the C/C++ libraries
during stage 2. Of course, the compiler built by stage 2, cc-lfs,
would be able to build those libraries, but:</para>
@ -278,7 +278,10 @@
</listitem>
</itemizedlist>
<para>So we have to re-build libstdc++ later as a part of gcc stage 2.</para>
<para>So when we build gcc stage 2, we instruct the building system to
rebuild libgcc and libstdc++ with cc1, but link libstdc++ to the newly
rebuilt libgcc instead of the degraded build. Then the rebuilt
libstdc++ will be fully functional.</para>
<para>In &ch-final; (or <quote>stage 3</quote>), all the packages needed for
the LFS system are built. Even if a package has already been installed into