Rename SYSCONFDIR macro to XML_SYSCONFDIR.
Use AX_RECURSIVE_EVAL with Autotools. This is GPL v2 with Autoconf
exception which shouldn't be a problem.
Finally support meson.
This should make sure that configurations are valid but doesn't warn
about invalid configurations.
CMake only supports boolean options and I have no idea how features
like "minimal" or "legacy" that change default values of other options
could be supported.
Fixes#551.
Unless we are on Windows, the following POSIX headers are required.
They're part of the earliest POSIX specs and it doesn't make sense to
check for them.
- fcntl.h
- unistd.h
- sys/stat.h
- sys/time.h
On Windows, io.h, fcntl.h and sys/stat.h are always available.
Move source code for xmllint shell to shell.c and move it from the
libxml2 library to the xmllint executable.
Also allow shell to run without XPath and debug modules.
Add stubs for old shell API functions in legacy build mode.
This option would allow for a smaller, but mostly useless minimal build.
But it complicates the symbol availability logic in an insane way and
requires specialized tools like our custom C parser in doc/apibuild.py.
See #717.
The latest spec for what it essentially an XPath extension seems to be
this working draft from 2002:
https://www.w3.org/TR/xptr-xpointer/
The xpointer() scheme is listed as "being reviewed" in the XPointer
registry since at least 2006. libxml2 seems to be the only modern
software that tries to implement this spec, but the code has many bugs
and quality issues.
If you configure --with-legacy, old symbols are retained for ABI
compatibility.
libxml2 has limited support for reading and writing compressed data
with the help of zlib and liblzma which used to be enabled by default.
This only works for files read from the file system and never worked
with memory buffers. My guess is that this feature is virtually unused.
In light of the recently discovered xz backdoor, it's a good time to
disable these features by default to reduce attack surface and prepare
for eventual removal.
If --with-legacy is passed to the Autotools build, compression will
be enabled by default as before.
The global struct is quite large (~700 bytes on 64-bit systems which
will be allocated for each thread whether it uses libxml2 or not) and
already close to the total size limit on some platforms.
Disable compiler TLS by default.
Trio is a rather old cross-platform printf library which was bundled with
libxml2. It was needed for ancient pre-C99 systems without snprintf and
should be safe to remove these days.
