diff options
Diffstat (limited to 'chapter06')
| -rw-r--r-- | chapter06/adjusting.xml | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/chapter06/adjusting.xml b/chapter06/adjusting.xml index 5852d2958..3e6b49e19 100644 --- a/chapter06/adjusting.xml +++ b/chapter06/adjusting.xml @@ -24,15 +24,17 @@ mv -v /tools/$(uname -m)-pc-linux-gnu/bin/{ld,ld-old} mv -v /tools/bin/{ld-new,ld} ln -sv /tools/bin/ld /tools/$(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@$@ -isystem /usr/include@}' > \ + -e '/\*cpp:/{n;s@$@ -idirafter /usr/include@}' > \ `dirname $(gcc --print-libgcc-file-name)`/specs</userinput></screen> <para>It is a good idea to visually inspect the specs file to verify the @@ -72,13 +74,18 @@ readelf -l a.out | grep ': /lib'</userinput></screen> <para os="g">Verify that the compiler is searching for the correct header 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 <...> 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> <screen os="j"><userinput>grep 'SEARCH.*/usr/lib' dummy.log |sed 's|; |\n|g'</userinput></screen> |