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| author | Bruce Dubbs <bdubbs@linuxfromscratch.org> | 2014-05-11 21:58:56 +0000 |
|---|---|---|
| committer | Bruce Dubbs <bdubbs@linuxfromscratch.org> | 2014-05-11 21:58:56 +0000 |
| commit | 6206f72d670d6b9de52f40e3dc54648d08146801 (patch) | |
| tree | 02b5539f734d2fbe87d583789ca368b579fcfa92 /chapter06/gcc.xml | |
| parent | f6fe5000d71afe93a210ee5e0976fac1a114c03f (diff) | |
Add a patch to binutils to enable LTO with gcc-4.9.0.
Remove omit-frame-pointer in gcc-pass2 and Chapter 6 gcc.
git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@10561 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
Diffstat (limited to 'chapter06/gcc.xml')
| -rw-r--r-- | chapter06/gcc.xml | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/chapter06/gcc.xml b/chapter06/gcc.xml index 7c92ccf28..c1434e7e3 100644 --- a/chapter06/gcc.xml +++ b/chapter06/gcc.xml @@ -45,7 +45,7 @@ programs to fail:</para> <screen><userinput remap="pre">patch -Np1 -i ../&gcc-upstream-patch;</userinput></screen> - +<!-- <para>As in <xref linkend="ch-tools-gcc-pass2"/>, apply the following <command>sed</command> to force the build to use the <option>-fomit-frame-pointer</option> compiler flag in order to ensure @@ -54,7 +54,7 @@ <screen><userinput remap="pre">case `uname -m` in i?86) sed -i 's/^T_CFLAGS =$/& -fomit-frame-pointer/' gcc/Makefile.in ;; esac</userinput></screen> - +--> <para>The GCC documentation recommends building GCC outside of the source directory in a dedicated build directory:</para> @@ -150,6 +150,14 @@ cd ../gcc-build</userinput></screen> <screen><userinput remap="install">ln -sv gcc /usr/bin/cc</userinput></screen> + <para>Add a compatibility symlink to enable building programs with + Link Time Optimization (LTO):</para> + +<screen><userinput remap="install">install -dm755 /usr/lib/bfd-plugins +pushd /usr/lib/bfd-plugins +ln -sfv ../../libexec/gcc/x86_64-unknown-linux-gnu/&gcc-version;/liblto_plugin.so +popd</userinput></screen> + <para>Now that our final toolchain is in place, it is important to again ensure that compiling and linking will work as expected. We do this by performing the same sanity checks as we did earlier in the chapter:</para> |