6.26.2. Contents of Zlib
Installed libraries:
libz.so
6.26. Zlib-1.2.3
The Zlib package contains compression and decompression routines used by some programs.
User Notes: http://wiki.linuxfromscratch.org/hlfs/wiki/zlib
6.26.1. Installation of Zlib
![[Note]](../images/note.png)
Note
Zlib is known to build its shared library incorrectly if
CFLAGS is specified in the
environment. If using a specified CFLAGS variable, be sure to add the -fPIC directive to the CFLAGS variable for the duration of the configure
command below, then remove it afterwards. This is only an issue
if you did not add the ASLR (-fPIC) modification to GCC specs.
We can add compiler warnings to Zlib:
sed '0,/^# udpate Makefile/s//CFLAGS="$CFLAGS \\\
-Wall -Wformat-security -Wwrite-strings -Wpointer-arith \\\
-Wstrict-prototypes -Wmissing-prototypes -Werror -Wfatal-errors"\n&/' \
-i.orig configure
Prepare Zlib for compilation:
./configure --prefix=/usr --shared --libdir=/lib
Compile the package:
make
To test the results, issue: make
check.
Install the shared library:
make install
The previous command installed symbolic link in /lib. We will remove it and relink it into
/usr/lib:
rm -v /lib/libz.so ln -vsf ../../lib/libz.so.1.2.3 /usr/lib/libz.so