Fix MSVC compatibility issues

Project now builds in Visual Studio 2017, probably earlier versions
too as long as they support enough of C99.

hook/iohook.c

@@ -1,4 +1,5 @@
 #define WIN32_NO_STATUS
+/* See precompiled.h for more information */
 #include <windows.h>
 #undef WIN32_NO_STATUS
 #include <winternl.h>

hook/meson.build

@@ -1,7 +1,10 @@
 hook_lib = static_library(
     'hook',
     include_directories : inc,
-    c_pch : '../precompiled.h',
+    c_pch : [
+        '../precompiled.c',
+        '../precompiled.h',
+    ],
     sources : [
         'args.c',
         'args.h',

hooklib/meson.build

@@ -1,7 +1,10 @@
 hooklib_lib = static_library(
     'hooklib',
     include_directories : inc,
-    c_pch : '../precompiled.h',
+    c_pch : [
+        '../precompiled.c',
+        '../precompiled.h',
+    ],
     sources : [
         'serial.c',
         'serial.h',

hooklib/serial.c

@@ -1,6 +1,10 @@
 #include <windows.h>
 
+#ifdef __GNUC__
 #include <ntdef.h>
+#else
+#include <winnt.h>
+#endif
 #include <devioctl.h>
 #include <ntddser.h>
 

hooklib/uart.c

@@ -1,6 +1,10 @@
 #include <windows.h>
 
+#ifdef __GNUC__
 #include <ntdef.h>
+#else
+#include <winnt.h>
+#endif
 #include <devioctl.h>
 #include <ntddser.h>
 

hooklib/uart.h

@@ -2,7 +2,11 @@
 
 #include <windows.h>
 
+#ifdef __GNUC__
 #include <ntdef.h>
+#else
+#include <winnt.h>
+#endif
 #include <devioctl.h>
 #include <ntddser.h>
 

inject/meson.build

@@ -1,7 +1,10 @@
 executable(
     'inject',
     include_directories : inc,
-    c_pch : '../precompiled.h',
+    c_pch : [
+        '../precompiled.c',
+        '../precompiled.h',
+    ],
     sources : [
         'debug.c',
         'debug.h',

meson.build

@@ -1,18 +1,26 @@
 project('capnhook', 'c', version: '0.1.0')
 
 add_project_arguments(
-    '-Wall',
     '-DCOBJMACROS',
-    '-ffunction-sections',
-    '-fdata-sections',
+    '-DWIN32_LEAN_AND_MEAN',
     language: 'c',
 )
 
-add_project_link_arguments(
-    '-Wl,--gc-sections',
-    '-static-libgcc',
-    language: 'c',
-)
+# Use get_argument_syntax() instead once Meson 0.49.0 releases
+if meson.get_compiler('c').get_id() != 'msvc'
+    add_project_arguments(
+        '-Wall',
+        '-ffunction-sections',
+        '-fdata-sections',
+        language: 'c',
+    )
+
+    add_project_link_arguments(
+        '-Wl,--gc-sections',
+        '-static-libgcc',
+        language: 'c',
+    )
+endif
 
 inc = include_directories('.')
 

precompiled.c

@@ -0,0 +1 @@
+#include "precompiled.h"

precompiled.h

@@ -1,13 +1,27 @@
+/*
+    Making NTSTATUS available is slightly awkward. See:
+    https://kirkshoop.github.io/2011/09/20/ntstatus.html
+*/
+
 /* Win32 user-mode API */
+#define WIN32_NO_STATUS
 #include <windows.h>
+#undef WIN32_NO_STATUS
 #include <winternl.h>
 #include <tlhelp32.h>
 #include <unknwn.h>
 
 /* Win32 kernel-mode definitions */
+#ifdef __GNUC__
+/* MinGW needs to include this for PHYSICAL_ADDRESS to be defined.
+   The MS SDK throws a bunch of duplicate symbol errors instead. */
 #include <ntdef.h>
+#else
+#include <winnt.h>
+#endif
 #include <devioctl.h>
 #include <ntddser.h>
+#include <ntstatus.h>
 
 /* ANSI C */
 #include <assert.h>