Update XZ Utils to 5.0.3 (in deps)

PACKAGERS

 
 Information to packagers of XZ Utils
 ====================================
 
     0. Preface
     1. Package naming
     2. Package description
     3. License
     4. configure options
-       4.1. Static vs. dynamic linking of liblzma
-       4.2. Optimizing xzdec and lzmadec
     5. Additional documentation
     6. Extra files
     7. Installing XZ Utils and LZMA Utils in parallel
     8. Example
 
 
 0. Preface
 ----------
 
     This document is meant for people who create and maintain XZ Utils
@@ skipping 112 matching lines @@
     only for embedded systems, don't use the following configure options:
 
         --enable-debug
         --enable-encoders (*)
         --enable-decoders
         --enable-match-finders
         --enable-checks
         --enable-small (*)
         --disable-threads (*)
 
-    (*) These are OK when building xzdec and lzmadec as explained later.
+    (*) These are OK when building xzdec and lzmadec as described
+        in INSTALL.
 
-    You may use --enable-werror but be careful with it since it may break
-    the build due to some useless warning when the build environment
-    changes (like CPU architecture or compiler version).
-
-
-4.1. Static vs. dynamic linking of liblzma
-
-    The default is to link the most important command line tools against
-    static liblzma, and the less important tools against shared liblzma.
-    This can be changed by passing --enable-dynamic to configure, or by
-    not building static libraries at all by passing --disable-static
-    to configure. It is mildly recommended that you use the default, but
-    the configure options make it easy to do otherwise if the distro policy
-    so requires.
-
-    On 32-bit x86, linking against static liblzma can give a minor
-    speed improvement. Static libraries on x86 are usually compiled as
-    position-dependent code (non-PIC) and shared libraries are built as
-    position-independent code (PIC). PIC wastes one register, which can
-    make the code slightly slower compared to a non-PIC version. (Note
-    that this doesn't apply to x86-64.)
-
-    Linking against static liblzma avoids a dependency on liblzma shared
-    library, and makes it slightly easier to copy the command line tools
-    between systems (e.g. quick 'n' dirty emergency recovery of some
-    files). It also allows putting the command line tools to /bin while
-    leaving liblzma to /usr/lib (assuming that your distribution uses
-    such a file system hierarchy), if no other file in /bin would require
-    liblzma.
-
-    If you don't want to distribute static libraries but you still
-    want to link the command line tools against static liblzma, it is
-    probably easiest to build both static and shared liblzma, but after
-    "make DESTDIR=$PKG install" remove liblzma.a and modify liblzma.la
-    to not contain a reference to liblzma.a.
-
-
-4.2. Optimizing xzdec and lzmadec
-
-    xzdec and lzmadec are intended to be relatively small instead of
-    optimizing for the best speed. Thus, it is a good idea to build
-    xzdec and lzmadec separately:
-
-      - Only decoder code is needed, so you can speed up the build
-        slightly by passing --disable-encoders to configure. This
-        shouldn't affect the final size of the executables though,
-        because the linker is able to omit the encoder code anyway.
-
-      - xzdec and lzmadec will never use multithreading capabilities of
-        liblzma. You can avoid dependency on libpthread by passing
-        --disable-threads to configure.
-
-      - There are and will be no translated messages for xzdec and
-        lzmadec, so it is fine to pass also --disable-nls to configure.
-
-      - To select somewhat size-optimized variant of some things in
-        liblzma, pass --enable-small to configure.
-
-      - Tell the compiler to optimize for size instead of speed.
-        E.g. with GCC, put -Os into CFLAGS.
+    xzdec and lzmadec don't provide any functionality that isn't already
+    available in the xz tool. Shipping xzdec and lzmadec without size
+    optimization and statically-linked liblzma isn't very useful. Doing
+    that would give users the xzdec man page, which may make it easier
+    for people to find out that such tools exists, but the executables
+    wouldn't have any advantage over the full-featured xz.
 
 
 5. Additional documentation
 ---------------------------
 
     "make install" copies some additional documentation to $docdir
-    (--docdir in configure). These a copy of the GNU GPL v2, which can
-    be replaced with a symlink if your distro ships with shared copies
-    of the common license texts.
+    (--docdir in configure). There is a copy of the GNU GPL v2, which
+    can be replaced with a symlink if your distro ships with shared
+    copies of the common license texts.
+
+    liblzma API is currently only documented using Doxygen tags in the
+    API headers. It hasn't been tested much how good results Doxygen
+    is able to make from the tags (e.g. Doxyfile might need tweaking,
+    the tagging may need to be improved etc.), so it might be simpler
+    to just let people read docs directly from the .h files for now,
+    and also save quite a bit in package size at the same time.
 
 
 6. Extra files
 --------------
 
     The "extra" directory contains some small extra tools or other files.
     The exact set of extra files can vary between XZ Utils releases. The
     extra files have only limited use or they are too dangerous to be
     put directly to $bindir (7z2lzma.sh is a good example, since it can
     silently create corrupt output if certain conditions are not met).
@@ skipping 14 matching lines @@
     omitting the compatibility symlinks (lzma, unlzma, lzcat, lzgrep etc.)
     from the XZ Utils package. It's probably a good idea to still package
     the symlinks into a separate package so that users may choose if they
     want to use XZ Utils or LZMA Utils for handling .lzma files.
 
 
 8. Example
 ----------
 
     Here is an example for i686 GNU/Linux that
-      - links xz against static liblzma;
-      - includes only shared liblzma in the final package;
-      - links xzdec and lzmadec against static liblzma while
-        avoiding libpthread dependency.
+      - links xz and lzmainfo against shared liblzma;
+      - links size-optimized xzdec and lzmadec against static liblzma
+        while avoiding libpthread dependency;
+      - includes only shared liblzma in the final package; and
+      - copies also the "extra" directory to the package.
 
     PKG=/tmp/xz-pkg
     tar xf xz-x.y.z.tar.gz
     cd xz-x.y.z
     ./configure \
             --prefix=/usr \
-            --sysconfdir=/etc \
-            CFLAGS='-march=i686 -O2'
+            --disable-static \
+            --disable-xzdec \
+            --disable-lzmadec \
+            CFLAGS='-march=i686 -mtune=generic -O2'
     make
     make DESTDIR=$PKG install-strip
-    rm -f $PKG/usr/lib/lib*.a
-    sed -i "s/^old_library=.*$/old_library=''/" $PKG/usr/lib/lib*.la
     make clean
     ./configure \
             --prefix=/usr \
-            --sysconfdir=/etc \
             --disable-shared \
             --disable-nls \
             --disable-encoders \
             --enable-small \
             --disable-threads \
-            CFLAGS='-march=i686 -Os'
+            CFLAGS='-march=i686 -mtune=generic -Os'
     make -C src/liblzma
     make -C src/xzdec
     make -C src/xzdec DESTDIR=$PKG install-strip
     cp -a extra $PKG/usr/share/doc/xz