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gcc-pass2: Fix description of LDFLAGS_FOR_TARGET=

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Pass 2 libstdc++ still links to libgcc.a even with LDFLAGS_FOR_TARGET=,
despite this libgcc.a is from pass 2 instead of pass 1.

The difference between pass 2 libgcc and pass 1 libgcc is Glibc wasn't
installed when the pass 1 libgcc was built.  This difference causes both
consequences (1) pass 1 libgcc lacks shared library and (2) pass 1
libgcc cannot support C++ EH, but it's not (1) causing (2).
This commit is contained in:
Xi Ruoyao 2024-08-18 21:03:47 +08:00
parent 837731717d
commit 217802b9c0
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1 changed files with 5 additions and 4 deletions
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chapter06/gcc-pass2.xml
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@ -138,10 +138,11 @@ cd build</userinput></screen>
<term><parameter>LDFLAGS_FOR_TARGET=...</parameter></term>
<listitem>
<para>Allow <filename class="libraryfile">libstdc++</filename> to
use the shared <filename class="libraryfile">libgcc</filename> being
built in this pass, instead of the static version that was built in GCC
pass 1. This is necessary to support C++ exception
handling.</para>
use the <filename class="libraryfile">libgcc</filename> being
built in this pass, instead of the previous version built in
<xref linkend='ch-tools-gcc-pass1'/>. The previous version cannot
properly support C++ exception handling because it was built
without libc support.</para>
</listitem>
</varlistentry>