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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.
This works around a bug when cross-compiling to 32-bit MinGW:
https://sourceforge.net/p/mingw-w64/bugs/935/
This means that we don't fall back to the bundled Trio library if
snprintf couldn't be detected. Trio support is completely untested, most
likely broken and will be removed soon.
Fixes#625.
-Wnested-externs produces spurious warnings after implicit
declaration of functions.
-Winline is useless since we don't use inlines.
-Wredundant-decls was already removed for autotools.
Having slept on it, I've realised that baking the dependency CFLAGS into
the pkg-config file is pointless when it is only used to link against
them. It may even cause problems.
pkg-config supports `Requires.private` and `Libs.private` fields for
static linking. However, if you're building a dynamic binary, then
pkg-config will use the non-private fields, even if just the static
libxml2 is available. This will result in libxml2 being underlinked,
causing the build to fail. The solution is to fold the private fields
into the non-private fields when the shared libxml2 is not being built.
This works for Autotools and CMake. Meson also knows how to handle this
when it automatically generates pkg-config files.
The -I and -L flags you use to build should not necessarily be the same
ones you bake into installed files. If you are building with
dependencies located under a SYSROOT then the installed files should
have no knowledge of that SYSROOT. For example, if the build requires
`-L/path/to/sysroot/usr/lib/foo` then only `-L/usr/lib/foo` should be
baked into the installed files.
pkg-config is SYSROOT-aware, so this issue can be sidestepped by using
the `Requires` field rather than the `Libs` and `Cflags` fields. This is
easily resolved if you rely solely on pkg-config, but this project falls
back to standard Autoconf checks, so a little more effort is required.
Unfortunately, this issue cannot feasibly be resolved for CMake.
`find_package` is used rather than `pkg_check_modules`, so we cannot
tell whether a pkg-config file for each dependency is present or not,
even if `find_package` uses pkg-config behind the scenes. The CMake
build does not record any dependency -I or -L flags into the pkg-config
file anyway. This is a problem in itself, although these dependencies
are most likely installed to standard locations.
Meson is very much better at handling this, as it generates the
pkg-config file automatically using the correct logic.
Use a custom test program which includes iconv.h, so we can check
whether the possibly redefined symbols in this header file match the
symbols in the iconv library.
Should fix#547.
Hardcode the required library on MinGW because winsock uses non-standard
calling conventions on 32-bit Windows which makes AC_SEARCH_LIBS fail.
Should fix#406.
