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Readjust the gcc header search path to include /usr/include and test it
git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@7972 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
This commit is contained in:
Dan Nichilson
parent
8bfbf407dd
commit
e9a652b5f0
@ -39,6 +39,12 @@
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<listitem>
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<para>2007-03-23</para>
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<itemizedlist>
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<listitem>
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<para>[dnicholson] - When readjusting the GCC specs file, ensure
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that GCC will search for the system headers in /usr/include. An
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addition to the toolchain sanity checks has been made to test
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this. This fix originates from DIY Linux.</para>
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</listitem>
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<listitem>
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<para>[dnicholson] - Included the branch update patch for the
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temporary Glibc in Chapter 5 to help minimize differences with the
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@ -161,19 +161,20 @@ cd ../gcc-build</userinput></screen>
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href="readjusting.xml"
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xpointer="xpointer(//*[@os='g'])"/>
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<screen role="nodump"><userinput>grep -B2 '^ /usr/include' dummy.log</userinput></screen>
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<xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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href="readjusting.xml"
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xpointer="xpointer(//*[@os='h'])"/>
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<screen><computeroutput>#include <...> search starts here:
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/usr/lib/gcc/i686-pc-linux-gnu/&gcc-version;/include
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/usr/include</computeroutput></screen>
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<xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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href="readjusting.xml"
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xpointer="xpointer(//*[@os='i'])"/>
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<screen><computeroutput>SEARCH_DIR("/usr/i686-pc-linux-gnu/lib")
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SEARCH_DIR("/usr/local/lib")
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SEARCH_DIR("/lib")
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SEARCH_DIR("/usr/lib");</computeroutput></screen>
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<xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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href="readjusting.xml"
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xpointer="xpointer(//*[@os='j'])"/>
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@ -182,6 +183,11 @@ SEARCH_DIR("/usr/lib");</computeroutput></screen>
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href="readjusting.xml"
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xpointer="xpointer(//*[@os='k'])"/>
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<screen><computeroutput>SEARCH_DIR("/usr/i686-pc-linux-gnu/lib")
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SEARCH_DIR("/usr/local/lib")
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SEARCH_DIR("/lib")
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SEARCH_DIR("/usr/lib");</computeroutput></screen>
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<xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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href="readjusting.xml"
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xpointer="xpointer(//*[@os='l'])"/>
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@ -218,6 +224,14 @@ SEARCH_DIR("/usr/lib");</computeroutput></screen>
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href="readjusting.xml"
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xpointer="xpointer(//*[@os='t'])"/>
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<xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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href="readjusting.xml"
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xpointer="xpointer(//*[@os='u'])"/>
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<xi:include xmlns:xi="http://www.w3.org/2003/XInclude"
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href="readjusting.xml"
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xpointer="xpointer(//*[@os='v'])"/>
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</sect2>
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<sect2 id="contents-gcc" role="content">
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@ -44,9 +44,10 @@ ln -sv /tools/bin/ld /tools/$(gcc -dumpmachine)/bin/ld</userinput></screen>
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linkend="ch-tools-toolchaintechnotes" role=","/> if necessary.</para>
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</important>
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<screen><userinput>gcc -dumpspecs | \
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perl -p -e 's@/tools/lib/ld-linux.so.2@/lib/ld-linux.so.2@g;' \
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-e 's@\*startfile_prefix_spec:\n@$_/usr/lib/ @g;' > \
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<screen><userinput>gcc -dumpspecs | sed \
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-e 's@/tools/lib/ld-linux.so.2@/lib/ld-linux.so.2@g' \
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-e '/\*startfile_prefix_spec:/{n;s@.*@/usr/lib/ @}' \
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-e '/\*cpp:/{n;s@$@ -isystem /usr/include@}' > \
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`dirname $(gcc --print-libgcc-file-name)`/specs</userinput></screen>
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<para>It is a good idea to visually inspect the specs file to verify the
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@ -57,7 +58,7 @@ perl -p -e 's@/tools/lib/ld-linux.so.2@/lib/ld-linux.so.2@g;' \
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as expected. To do this, perform the following sanity checks:</para>
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<screen role="nodump" os="a"><userinput>echo 'main(){}' > dummy.c
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cc dummy.c -Wl,--verbose &> dummy.log
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cc dummy.c -v -Wl,--verbose &> dummy.log
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readelf -l a.out | grep ': /lib'</userinput></screen>
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<para os="b">If everything is working correctly, there should be no errors,
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@ -80,44 +81,54 @@ readelf -l a.out | grep ': /lib'</userinput></screen>
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/usr/lib/crti.o succeeded
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/usr/lib/crtn.o succeeded</computeroutput></screen>
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<para os="g">Next, verify that the new linker is being used with the correct search paths:</para>
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<para os="g">Verify that the compiler is searching for the correct header
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files:</para>
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<screen role="nodump" os="h"><userinput>grep 'SEARCH.*/usr/lib' dummy.log |sed 's|; |\n|g'</userinput></screen>
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<screen role="nodump"><userinput>grep -B1 '^ /usr/include' dummy.log</userinput></screen>
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<para os="i">If everything is working correctly, there should be no errors,
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<para os="h">This command should return successfully with the following output:</para>
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<screen><computeroutput>#include <...> search starts here:
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/usr/include</computeroutput></screen>
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<para os="i">Next, verify that the new linker is being used with the correct search paths:</para>
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<screen role="nodump" os="j"><userinput>grep 'SEARCH.*/usr/lib' dummy.log |sed 's|; |\n|g'</userinput></screen>
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<para os="k">If everything is working correctly, there should be no errors,
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and the output of the last command will be:</para>
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<screen><computeroutput>SEARCH_DIR("/tools/i686-pc-linux-gnu/lib")
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SEARCH_DIR("/usr/lib")
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SEARCH_DIR("/lib");</computeroutput></screen>
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<para os="j">Next make sure that we're using the correct libc:</para>
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<para os="l">Next make sure that we're using the correct libc:</para>
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<screen role="nodump" os="k"><userinput>grep "/lib/libc.so.6 " dummy.log</userinput></screen>
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<screen role="nodump" os="m"><userinput>grep "/lib/libc.so.6 " dummy.log</userinput></screen>
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<para os="l">If everything is working correctly, there should be no errors,
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<para os="n">If everything is working correctly, there should be no errors,
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and the output of the last command will be:</para>
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<screen os="m"><computeroutput>attempt to open /lib/libc.so.6 succeeded</computeroutput></screen>
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<screen os="o"><computeroutput>attempt to open /lib/libc.so.6 succeeded</computeroutput></screen>
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<para os="n">Lastly, make sure GCC is using the correct dynamic linker:</para>
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<para os="p">Lastly, make sure GCC is using the correct dynamic linker:</para>
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<screen role="nodump" os="o"><userinput>grep found dummy.log</userinput></screen>
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<screen role="nodump" os="q"><userinput>grep found dummy.log</userinput></screen>
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<para os="p">If everything is working correctly, there should be no errors,
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<para os="r">If everything is working correctly, there should be no errors,
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and the output of the last command will be (allowing for
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platform-specific differences in dynamic linker name):</para>
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<screen os="q"><computeroutput>found ld-linux.so.2 at /lib/ld-linux.so.2</computeroutput></screen>
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<screen os="s"><computeroutput>found ld-linux.so.2 at /lib/ld-linux.so.2</computeroutput></screen>
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<para os="r">If the output does not appear as shown above or is not received
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<para os="t">If the output does not appear as shown above or is not received
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at all, then something is seriously wrong. Investigate and retrace the
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steps to find out where the problem is and correct it. The most likely
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reason is that something went wrong with the specs file adjustment. Any
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issues will need to be resolved before continuing on with the process.</para>
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<para os="s">Once everything is working correctly, clean up the test files:</para>
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<para os="u">Once everything is working correctly, clean up the test files:</para>
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<screen role="nodump" os="t"><userinput>rm -v dummy.c a.out dummy.log</userinput></screen>
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<screen role="nodump" os="v"><userinput>rm -v dummy.c a.out dummy.log</userinput></screen>
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</sect1>
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