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toolchaintechnotes: add the rationale for cross compiling ch6 packages

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"need to be cross compiled" alone does not make too much sense: we
compile these packages in chapter 8 anyway.  The real reason forcing a
cross compilation is circular dependency: if building A needs B but
building B needs A, we'll have to cross compile at least one of A and B
or we won't be able to build either in the chroot.
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Xi Ruoyao 2022-09-29 19:36:44 +08:00
parent a243b36b8b
commit ea9263cbf0
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part3intro/toolchaintechnotes.xml
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@ -320,8 +320,9 @@ checking what linker to use... /mnt/lfs/tools/i686-lfs-linux-gnu/bin/ld</compute
and generally does not rely on toolchain defaults.</para> and generally does not rely on toolchain defaults.</para>
<para>As mentioned above, the standard C++ library is compiled next, followed in <para>As mentioned above, the standard C++ library is compiled next, followed in
<xref linkend="chapter-temporary-tools"/> by all the remaining programs that need <xref linkend="chapter-temporary-tools"/> by other programs that need
to be cross compiled. The install step of all those packages uses the to be cross compiled for breaking circular dependencies at build time.
The install step of all those packages uses the
<envar>DESTDIR</envar> variable to force installation <envar>DESTDIR</envar> variable to force installation
in the LFS filesystem.</para> in the LFS filesystem.</para>