6.22.3. Contents of Flex
Installed programs:
flex and lex
Installed library:
libfl.a libfl_pic.a
The Flex package contains a utility for generating programs that recognize patterns in text.
This package requires compiler variables to be set for the target in the environment.
export CC="${CLFS_TARGET}-gcc"
export CXX="${CLFS_TARGET}-g++"
export AR="${CLFS_TARGET}-ar"
export AS="${CLFS_TARGET}-as"
export RANLIB="${CLFS_TARGET}-ranlib"
export LD="${CLFS_TARGET}-ld"
export STRIP="${CLFS_TARGET}-strip"
Make sure that Flex doesn't try to include headers from /usr/include.
cp -v Makefile.in{,.orig}
sed "s/-I@includedir@//g" Makefile.in.orig > Makefile.in
When Cross Compiling the configure script does not does not determine the correct values for the following, Set the values manually:
cat > config.cache << EOF ac_cv_func_malloc_0_nonnull=yes ac_cv_func_realloc_0_nonnull=yes EOF
Prepare Flex for compilation:
./configure --build=${CLFS_HOST} --host=${CLFS_TARGET} \
--prefix=/usr --cache-file=config.cache
Compile the package:
make CC="${CC} -fPIC" libfl.a
make
Install the package:
make DESTDIR=${CLFS} install
There are some packages that expect to find the lex library in /usr/lib. Create a symlink to account for this:
ln -sfv libfl.a ${CLFS}/usr/lib/libl.a
A few programs do not know about flex yet and try to run its
predecessor, lex. To
support those programs, create a wrapper script named lex that calls flex
in lex emulation
mode:
cat > ${CLFS}/usr/bin/lex << "EOF"
#!/bin/sh
# Begin /usr/bin/lex
exec /usr/bin/flex -l "$@"
# End /usr/bin/lex
EOF
chmod -v 755 ${CLFS}/usr/bin/lex