diff options
| author | Xi Ruoyao <xry111@mengyan1223.wang> | 2022-02-15 15:29:35 +0800 |
|---|---|---|
| committer | Xi Ruoyao <xry111@mengyan1223.wang> | 2022-02-15 15:29:35 +0800 |
| commit | 174d1bf948e00b20db2bfc162dda6ef18c1d2bbc (patch) | |
| tree | 1d82c566e36641733976c69ce8cb82992278fe65 /chapter05/libstdc++.xml | |
| parent | 81d3242ba4b2ff06ed0202cea68e64f93fa09b6c (diff) | |
libstdc++ pass 1: rephrase the explanation for --with-gxx-include-dir
I just received a private mail from some guy obviously puzzled by this
switch. Expand the explanation a little to make it more clear.
Diffstat (limited to 'chapter05/libstdc++.xml')
| -rw-r--r-- | chapter05/libstdc++.xml | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/chapter05/libstdc++.xml b/chapter05/libstdc++.xml index 750868591..91f2b6b19 100644 --- a/chapter05/libstdc++.xml +++ b/chapter05/libstdc++.xml @@ -92,11 +92,21 @@ cd build</userinput></screen> <varlistentry> <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> |