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| -rw-r--r-- | chapter08/introduction.xml | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/chapter08/introduction.xml b/chapter08/introduction.xml index b05a9761a..2be7fe053 100644 --- a/chapter08/introduction.xml +++ b/chapter08/introduction.xml @@ -20,20 +20,28 @@ work is to know what each package is used for and why you (or the system) may need it.</para> - <para>We do not recommend using optimizations. They can make + <para>We do not recommend using customized optimizations. They can make a program run slightly faster, but they may also cause compilation difficulties, and problems when running the program. If a package refuses to - compile when using optimization, try to compile it without optimization and - see if that fixes the problem. Even if the package does compile when using + compile with a customized optimization, try to compile it without + optimization and see if that fixes the problem. Even if the package does compile when using a customized optimization, there is the risk it may have been compiled incorrectly because of the complex interactions between the code and the build tools. Also note that the <option>-march</option> and <option>-mtune</option> options using values not specified in the book have not been tested. This may cause problems with the toolchain packages (Binutils, GCC and Glibc). The small potential gains - achieved by using compiler optimizations are often outweighed by the risks. + achieved by customizing compiler optimizations are often outweighed by the risks. First-time builders of LFS are encouraged to build without custom - optimizations. The resulting system will still run very fast, and be stable - at the same time.</para> + optimizations.</para> + + <para>On the other hand, we keeps the optimizations enabled by the default + configuration of packages. In addition, we sometimes explicitly enable an + optimized configuration provided by the package but not enabled by + default. The package maintainers have already tested these configurations + and consider them safe, so it's not likely they would break the build. + Generally the default configuration already enables <option>-O2</option> + or <option>-O3</option>, so the resulting system will still run very fast + without any customized optimization, and be stable at the same time.</para> <para>Before the installation instructions, each installation page provides information about the package, including a concise description of what it |