MTD 248-645A Bedienungsanleitung PDF herunterladen (Seite 68)

Linux From Scratch - Version 7.0

The meaning of the new configure options:

--enable-clocale=gnu

This option ensures the correct locale model is selected for the C++ libraries under all circumstances. If the

configure script finds the de_DE locale installed, it will select the correct gnu locale model. However, if the

de_DE locale is not installed, there is the risk of building Application Binary Interface (ABI)-incompatible C+

+ libraries because the incorrect generic locale model may be selected.

--enable-threads=posix

This enables C++ exception handling for multi-threaded code.

--enable-__cxa_atexit

This option allows use of __cxa_atexit, rather than atexit, to register C++ destructors for local statics

and global objects. This option is essential for fully standards-compliant handling of destructors. It also affects

the C++ ABI, and therefore results in C++ shared libraries and C++ programs that are interoperable with other

Linux distributions.

--enable-languages=c,c++

This option ensures that both the C and C++ compilers are built.

--disable-libstdcxx-pch

Do not build the pre-compiled header (PCH) for libstdc++. It takes up a lot of space, and we have no use for it.

--disable-bootstrap

For native builds of GCC, the default is to do a "bootstrap" build. This does not just compile GCC, but compiles

it several times. It uses the programs compiled in a first round to compile itself a second time, and then again

a third time. The second and third iterations are compared to make sure it can reproduce itself flawlessly. This

also implies that it was compiled correctly. However, the LFS build method should provide a solid compiler

without the need to bootstrap each time.

Compile the package:

make

Install the package:

make install

As a finishing touch, create a symlink. Many programs and scripts run cc instead of gcc, which is used to keep

programs generic and therefore usable on all kinds of UNIX systems where the GNU C compiler is not always

installed. Running cc leaves the system administrator free to decide which C compiler to install:

ln -vs gcc /tools/bin/cc

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MTD 248-645A Bedienungsanleitung Seite 68