Changeset afc6823 for chapter06/adjusting.xml

Timestamp:

04/20/2020 12:50:49 PM (4 years ago)

Author:

Pierre Labastie <pieere@…>

Branches:

10.0, 10.0-rc1, 10.1, 10.1-rc1, 11.0, 11.0-rc1, 11.0-rc2, 11.0-rc3, 11.1, 11.1-rc1, 11.2, 11.2-rc1, 11.3, 11.3-rc1, 12.0, 12.0-rc1, 12.1, 12.1-rc1, arm, bdubbs/gcc13, ml-11.0, multilib, renodr/libudev-from-systemd, s6-init, trunk, xry111/arm64, xry111/arm64-12.0, xry111/clfs-ng, xry111/lfs-next, xry111/loongarch, xry111/loongarch-12.0, xry111/loongarch-12.1, xry111/mips64el, xry111/pip3, xry111/rust-wip-20221008, xry111/update-glibc

Children:

7fd302c

Parents:

0b403eb3

Message:

Change -isystem to -idirafter in "adjusting". Fix most of #4641.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11819 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

File:

• chapter06/adjusting.xml (modified) (2 diffs)

chapter06/adjusting.xml

@@ -25 +25 @@
 ln -sv /tools/bin/ld /tools/$(uname -m)-pc-linux-gnu/bin/ld</userinput></screen>
 
-  <para>Next, amend the GCC specs file so that it points to the new
-  dynamic linker. Simply deleting all instances of <quote>/tools</quote> should
-  leave us with the correct path to the dynamic linker. Also adjust the specs file
-  so that GCC knows where to find the correct headers and Glibc start files.
+  <para>the next command amends the GCC specs file to achieve three goals:
+  first point GCC to the new dynamic linker. Simply deleting all instances of
+  <quote>/tools</quote> should leave us with the correct path to the dynamic
+  linker. Second, let GCC know where to find the Glibc start files. Third,
+  add the /usr/include directory at the end of the default search path, so
+  that header files added in chapter 6 are found.
   A <command>sed</command> command accomplishes this:</para>
 
 <screen><userinput>gcc -dumpspecs | sed -e 's@/tools@@g'                   \
     -e '/\*startfile_prefix_spec:/{n;s@.*@/usr/lib/ @}' \
-    -e '/\*cpp:/{n;s@$@ -isystem /usr/include@}' &gt;      \
+    -e '/\*cpp:/{n;s@$@ -idirafter /usr/include@}' &gt;      \
     `dirname $(gcc --print-libgcc-file-name)`/specs</userinput></screen>
 
@@ -73 +75 @@
   files:</para>
 
-<screen><userinput>grep -B1 '^ /usr/include' dummy.log</userinput></screen>
+<screen><userinput>grep -B4 '^ /usr/include' dummy.log</userinput></screen>
 
   <para os="h">This command should return the following output:</para>
 
 <screen><computeroutput>#include &lt;...&gt; search starts here:
+ /tools/lib/gcc/x86_64-pc-linux-gnu/&gcc-version;/include
+ /tools/include
+ /tools/lib/gcc/x86_64-pc-linux-gnu/&gcc-version;/include-fixed
  /usr/include</computeroutput></screen>
+
+  <note><para>On a 32 bit system, x86_64 is replaced with i686.</para></note>
 
   <para os="i">Next, verify that the new linker is being used with the correct search paths:</para>