support -Ddefault_library=both for windows

src/meson.build

@@ -28,23 +28,45 @@ libcubescript_src = [
     'lib_str.cc'
 ]
 
-lib_cxxflags = [ '-DLIBCUBESCRIPT_BUILD' ]
-host_system = host_machine.system()
+lib_cxxflags = extra_cxxflags + [ '-DLIBCUBESCRIPT_BUILD' ]
+dyn_cxxflags = lib_cxxflags
 
-if host_system == 'windows' or host_system == 'cygwin'
-    if get_option('default_library') != 'static'
-        lib_cxxflags += '-DLIBCUBESCRIPT_DLL'
-    endif
+lib_incdirs = libcubescript_includes + [include_directories('.')]
+
+host_system = host_machine.system()
+os_uses_dlls = (host_system == 'windows' or host_system == 'cygwin')
+
+if os_uses_dlls
+    dyn_cxxflags += '-DLIBCUBESCRIPT_DLL'
 endif
 
-libcubescript_target = library('cubescript',
-    libcubescript_src,
-    include_directories: libcubescript_includes + [include_directories('.')],
-    cpp_args: extra_cxxflags + lib_cxxflags,
-    install: true,
-    pic: true,
-    version: meson.project_version()
-)
+if os_uses_dlls and get_option('default_library') == 'both'
+    # we need a bunch of this nonsense on windows as both_libraries()
+    # does not work reliably there; since DLLs work like they do, we
+    # need to compile one set of object files with dllexport and the
+    # other set without that, and there is no way to tell meson to
+    # do that other than making two different targets...
+    libcubescript_static = static_library('cubescript',
+        libcubescript_src, include_directories: lib_incdirs,
+        cpp_args: lib_cxxflags,
+        install: true
+    )
+    libcubescript_dynamic = shared_library('cubescript',
+        libcubescript_src, include_directories: lib_incdirs,
+        cpp_args: dyn_cxxflags,
+        install: true,
+        version: meson.project_version()
+    )
+    libcubescript_target = libcubescript_dynamic
+else
+    libcubescript_target = library('cubescript',
+        libcubescript_src, include_directories: lib_incdirs,
+        cpp_args: dyn_cxxflags,
+        install: true,
+        pic: true,
+        version: meson.project_version()
+    )
+endif
 
 libcubescript = declare_dependency(
     include_directories: libcubescript_includes,