ALMOST fixed the build on Windows with MSVC. (For the change to test/testing.h: Even in VS2019 inline isn't available in C, ugh. That function doesn't need to be inline anyway, so eh.)

common/init.c

@@ -1,4 +1,5 @@
 // 19 april 2019
+#include <stdarg.h>
 #include <stdio.h>
 #include <string.h>
 #include "ui.h"

common/uipriv.h

@@ -1,7 +1,15 @@
 // 19 april 2019
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 // init.c
 extern int uiprivInitCheckParams(void *options, uiInitError *err, const char *initErrors[]);
 extern int uiprivInitReturnError(uiInitError *err, const char *msg);
 extern int uiprivInitReturnErrorf(uiInitError *err, const char *msg, ...);
 extern void uiprivMarkInitialized(void);
+
+#ifdef __cplusplus
+}
+#endif

meson.build

@@ -142,7 +142,7 @@ libui_soversion = ''
 libui_rpath = ''
 subdir('common')
 if libui_OS == 'windows'
-#	subdir('windows')
+	subdir('windows')
 	install_headers('ui_windows.h')
 elif libui_OS == 'darwin'
 	subdir('darwin')

test/meson.build

@@ -6,17 +6,17 @@ libui_test_sources = [
 	'testing.c',
 ]
 
-if libui_OS == 'windows'
+#if libui_OS == 'windows'
-	libui_test_manifest = 'test.manifest'
+#	libui_test_manifest = 'test.manifest'
-	if libui_mode == 'static'
+#	if libui_mode == 'static'
-		libui_test_manifest = 'test.static.manifest'
+#		libui_test_manifest = 'test.static.manifest'
-	endif
+#	endif
-	libui_test_sources += [
+#	libui_test_sources += [
-		windows.compile_resources('resources.rc',
+#		windows.compile_resources('resources.rc',
-			args: libui_manifest_args,
+#			args: libui_manifest_args,
-			depend_files: [libui_test_manifest]),
+#			depend_files: [libui_test_manifest]),
-	]
+#	]
-endif
+#endif
 
 # TODO once we upgrade to 0.49.0, add pie: true
 # TODO once we upgrade to 0.50.0, add protocol: 'exitcode'

test/testing.h

@@ -6,7 +6,7 @@
 
 #define testingprivScaffoldName(basename) testingprivScaffold ## basename
 #define testingprivMkScaffold(basename, argtype, argname) \
-	static inline void testingprivScaffoldName(basename)(argtype *argname) { testingprivImplName(basename)(argname); }
+	static void testingprivScaffoldName(basename)(argtype *argname) { testingprivImplName(basename)(argname); }
 
 // references:
 // - https://gitlab.gnome.org/GNOME/glib/blob/master/glib/gconstructor.h

windows/init.cpp

@@ -1,6 +1,5 @@
 // 6 april 2015
 #include "uipriv_windows.hpp"
-#include "attrstr.hpp"
 
 HINSTANCE uipriv_hInstance = NULL;
 int uipriv_nCmdShow;
@@ -61,27 +60,27 @@ int uiInit(void *options, uiInitError *err)
 		return uiprivInitReturnHRESULT(err, errICCFailed, HRESULT_FROM_WIN32(lasterr));
 	}
 
-	hr = CoInitialize(NULL);
+/*	hr = CoInitialize(NULL);
 	if (hr != S_OK && hr != S_FALSE)
 		return ieHRESULT("initializing COM", hr);
 	// LONGTERM initialize COM security
 	// LONGTERM turn off COM exception handling
-
+*/
 	uiprivMarkInitialized();
 	return 1;
 }
 
 void uiUninit(void)
 {
-	CoUninitialize();
+//	CoUninitialize();
 }
 
 #ifndef uiStatic
 
-BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
+BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD fdwReason, LPVOID lpvReserved)
 {
 	if (fdwReason == DLL_PROCESS_ATTACH)
-		hInstance = hinstDLL;
+		uipriv_hInstance = hInstance;
 	return TRUE;
 }
 

windows/meson.build

@@ -10,13 +10,13 @@ libui_sources += [
 # For a DLL, we have to include this directly, so we do so.
 # Windows won't link resources in static libraries, so including this would have no effect.
 # In those cases, we just need them to include the manifest with the executable (or link it directly into the output executable themselves); they can also customize the manifest as they see fit (assuming nothing breaks in the process).
-if libui_mode == 'shared'
+#if libui_mode == 'shared'
-	libui_sources += [
+#	libui_sources += [
-		windows.compile_resources('resources.rc',
+#		windows.compile_resources('resources.rc',
-			args: libui_manifest_args,
+#			args: libui_manifest_args,
-			depend_files: ['libui.manifest']),
+#			depend_files: ['libui.manifest']),
-	]
+#	]
-endif
+#endif
 
 foreach lib : ['user32', 'kernel32', 'gdi32', 'comctl32']
 	libui_deps += [