Changeset 738a4c1 for chapter05/libstdc++.xml

Timestamp:

02/16/2022 04:45:10 AM (2 years ago)

Author:

Thomas Trepl (Moody) <thomas@…>

Branches:

multilib

Children:

bb19832

Parents:

7158d79 (diff), 83e41da (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Automatic merge of trunk into multilib

File:

• chapter05/libstdc++.xml (modified) (1 diff)

chapter05/libstdc++.xml

@@ -103 +103 @@
         <term><parameter>--with-gxx-include-dir=/tools/$LFS_TGT/include/c++/&gcc-version;</parameter></term>
         <listitem>
-          <para>This is the location where the C++ compiler should search for the
-          standard include files. In a normal build, this information
+          <para>This specifies the installation directory for include files.
+          Because libstdc++ is the standard C++ library for LFS, this
+          directory should match the location where the C++ compiler
+          (<command>$LFS_TGT-g++</command>) would search for the
+          standard C++ include files. In a normal build, this information
           is automatically passed to the libstdc++ <command>configure</command>
           options from the top level directory. In our case, this information
-          must be explicitly given.</para>
+          must be explicitly given.
+          The C++ compiler will prepend the sysroot path
+          <filename class="directory">$LFS</filename> (specified building
+          GCC pass 1) to the include file search path, so it will actually
+          search in
+          <filename class="directory">$LFS/tools/$LFS_TGT/include/c++/&gcc-version;</filename>.
+          The combination of the <parameter>DESTDIR</parameter>
+          variable (in the <command>make install</command> command below)
+          and this switch ensures to install the headers there.</para>
         </listitem>
       </varlistentry>