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-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.
