On MSVC, shared libraries only export symbols that have been explicitly exported
either as part of the symbol prototype or via a module definitions file.
On compilers other than MSVC, all symbols are exported in the shared library by
default and the format for the list of symbols to export is different, so this
is only used with the VisualStudio compiler.
The module defs file path can either be relative to the current source directory
or an absolute path using meson.source_root() + '/some/path'
backend.get_target_private_dir() includes the target directory in the path.
However, we want to treat all paths relative from the target directory,
because that's where our VS project file lives in.
A shebang line on Windows will be resolved to [binary, script_path].
Thus, we need to use both instead of just taking the first element of the
command.
Everything in the VS project file is relative to the project file itself.
The project file gets put in the target.subdir, so to include files from
there we just need to use '.'. To include from the private dir, we
need to use the relative path from the target dir to the target private
dir.
bool to_int() will return 0 or 1, useful if one wants to set
a define to 0 or 1 based on a boolean result instead of having
it just defined or undefined.
bool to_string() will return 'true' or 'false' by default same
as when using it to format a string, but with the additional
possibility to specify two extra string arguments to be returned
as true/false values, e.g. to_string('yes', 'no'). This can be
useful when outputting messages to be shown to the user.
1. Dependencies must be set up with the target's id instead of its
basename.
2. Extracted object output file names must not include the directory
prefix, because MSBuild puts all object files into the same directory
and names them srcfilename.obj instead of dir/filename.obj or
dir_filename.obj.
The 'Rebuild' target fails in mysterious ways if multiple targets use
the same directories because of output files being deleted between two
build steps (e.g. test case 78 fails on Rebuild, whereas Clean + Build
work just fine).
Jussi Pakkanen
Nirbheek Chauhan
Nicolas Schneider
Tim-Philipp Müller
Nirbheek Chauhan