Install GCC by running the following commands:
mkdir $LFS/usr/src/gcc-build &&
cd $LFS/usr/src/gcc-build &&
../gcc-184.108.40.206/configure --prefix=/usr \
--enable-languages=c,c++ --disable-nls \
make -e LDFLAGS=-static bootstrap &&
make prefix=$LFS/usr install &&
cd $LFS/lib &&
ln -s ../usr/bin/cpp &&
cd $LFS/usr/lib &&
ln -s ../bin/cpp &&
cd $LFS/usr/bin &&
ln -s gcc cc
--enable-languages=c,c++: This only builds the C and C++ compilers and not the other available compilers as they are, on the average, not often used. If those other compilers are needed, the --enable-languages parameter can be omitted.
ln -s ../usr/bin/cpp: This creates the $LFS/lib/cpp symlink. Some packages explicitly try to find cpp in /lib.
ln -s ../bin/cpp: This creates the $LFS/usr/lib/cpp symlink as there are packages that expect cpp to be in /usr/lib.
The GCC package contains compilers, preprocessors and the GNU C++ Library.
A compiler translates source code in text format to a format that a computer understands. After a source code file is compiled into an object file, a linker will create an executable file from one or more of these compiler generated object files.
A preprocessor pre-processes a source file, such as including the contents of header files into the source file. It's a good idea to not do this manually to save a lot of time. Someone just inserts a line like #include <filename>. The preprocessor inserts the contents of that file into the source file. That's one of the things a preprocessor does.
The C++ library is used by C++ programs. The C++ library contains functions that are frequently used in C++ programs. This way the programmer doesn't have to write certain functions (such as writing a string of text to the screen) from scratch every time he creates a program.