fix PCHs on VS2019

* separate PCH for C and C++
* acconf.h now included in PCHs on windows, too
* meson now auto-generates companion source files for PCH headers

libaegisub/include/lagi_pre.h

@@ -1,7 +1,5 @@
 #ifdef __cplusplus
-#ifndef _WIN32
 #include "../acconf.h"
-#endif
 
 #define WIN32_LEAN_AND_MEAN
 

libaegisub/include/lagi_pre_c.h

@@ -0,0 +1,3 @@
+#include "../acconf.h"
+
+#define WIN32_LEAN_AND_MEAN

libaegisub/meson.build

@@ -79,13 +79,12 @@ else
 endif
 
 libaegisub_cpp_pch = ['include/lagi_pre.h']
-if cxx.get_id() == 'msvc'
-    libaegisub_cpp_pch += 'include/lagi_pre.cpp'
-endif
+libaegisub_c_pch = ['include/lagi_pre_c.h']
 
 libaegisub_inc = include_directories('include')
 
 libaegisub = static_library('aegisub', libaegisub_src, acconf,
                             include_directories: [libaegisub_inc, deps_inc],
                             cpp_pch: libaegisub_cpp_pch,
+                            c_pch: libaegisub_c_pch,
                             dependencies: deps)

src/include/agi_pre.cpp

@@ -1,6 +0,0 @@
-// A dummy file for compiling the precompiled header with VC++
-#if !defined(_MSC_VER)
-#error "This file is only for use with MSVC."
-#endif
-
-#include "agi_pre.h"

src/include/agi_pre.h

@@ -48,9 +48,7 @@
 #define _CRT_SECURE_NO_WARNINGS
 #endif
 
-#ifndef _WIN32
 #include "../../acconf.h"
-#endif
 
 #define WIN32_LEAN_AND_MEAN
 

src/include/agi_pre_c.h

@@ -0,0 +1,46 @@
+// Copyright (c) 2006, Rodrigo Braz Monteiro
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+//   * Redistributions of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//   * Redistributions in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//   * Neither the name of the Aegisub Group nor the names of its contributors
+//     may be used to endorse or promote products derived from this software
+//     without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+// Aegisub Project http://www.aegisub.org/
+
+#include "../../acconf.h"
+
+#define WIN32_LEAN_AND_MEAN
+
+#ifdef _WIN32
+#include <objbase.h>
+#include <mmsystem.h>
+#else
+#include <sys/param.h>
+#endif
+
+#ifdef HAVE_OPENGL_GL_H
+#include <OpenGL/gl.h>
+#else
+#include <GL/gl.h>
+#endif
+

src/meson.build

@@ -198,13 +198,12 @@ foreach opt: opt_src
 endforeach
 
 aegisub_cpp_pch = ['include/agi_pre.h']
-if cxx.get_id() == 'msvc'
-    aegisub_cpp_pch += 'include/agi_pre.cpp'
-endif
+aegisub_c_pch = ['include/agi_pre_c.h']
 
 aegisub = executable('aegisub', aegisub_src, version_h, acconf,
                      link_with: [libresrc, libluabins, libaegisub],
                      include_directories: [libaegisub_inc, libresrc_inc, version_inc, deps_inc],
                      cpp_pch: aegisub_cpp_pch,
+                     c_pch: aegisub_c_pch,
                      install: true,
                      dependencies: deps)