From 13698362f1726326ab60180b04a86df79b518614 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Mon, 18 Jan 2021 04:03:16 -0800
Subject: Avoid explicitly searching for the WindowsSDK

It's causing problems with various setups. So instead we'll have to assume some
things for Windows (namely that winmm exists, and if dsound isn't in DXSDK_DIR,
it needs to be in the compiler's default paths to be usable).
---
 CMakeLists.txt | 48 +++++++++++++++++++++++-------------------------
 1 file changed, 23 insertions(+), 25 deletions(-)

(limited to 'CMakeLists.txt')

diff --git a/CMakeLists.txt b/CMakeLists.txt
index bf2310a4..9eb7aa07 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -894,38 +894,36 @@ option(ALSOFT_REQUIRE_WINMM "Require Windows Multimedia backend" OFF)
 option(ALSOFT_REQUIRE_DSOUND "Require DirectSound backend" OFF)
 option(ALSOFT_REQUIRE_WASAPI "Require WASAPI backend" OFF)
 if(WIN32)
-    set(WINSDK_LIB_DIRS )
-    set(WINSDK_INCLUDE_DIRS )
-    find_package(WindowsSDK)
-    if(WINDOWSSDK_FOUND)
-        get_windowssdk_library_dirs(${WINDOWSSDK_PREFERRED_DIR} WINSDK_LIB_DIRS)
-        get_windowssdk_include_dirs(${WINDOWSSDK_PREFERRED_DIR} WINSDK_INCLUDE_DIRS)
-    endif()
-
     # Check MMSystem backend
-    check_include_files("windows.h;mmsystem.h" HAVE_MMSYSTEM_H)
-    find_library(WINMM_LIBRARY NAMES winmm
-        PATHS ${WINSDK_LIB_DIRS})
-    if(HAVE_MMSYSTEM_H AND WINMM_LIBRARY)
-        option(ALSOFT_BACKEND_WINMM "Enable Windows Multimedia backend" ON)
-        if(ALSOFT_BACKEND_WINMM)
-            set(HAVE_WINMM 1)
-            set(BACKENDS  "${BACKENDS} WinMM,")
-            set(ALC_OBJS  ${ALC_OBJS} alc/backends/winmm.cpp alc/backends/winmm.h)
-            set(EXTRA_LIBS ${WINMM_LIBRARY} ${EXTRA_LIBS})
-        endif()
+    option(ALSOFT_BACKEND_WINMM "Enable Windows Multimedia backend" ON)
+    if(ALSOFT_BACKEND_WINMM)
+        set(HAVE_WINMM 1)
+        set(BACKENDS "${BACKENDS} WinMM,")
+        set(ALC_OBJS ${ALC_OBJS} alc/backends/winmm.cpp alc/backends/winmm.h)
+        # There doesn't seem to be good way to search for winmm.lib for MSVC.
+        # find_library doesn't find it without being told to look in a specific
+        # place in the WindowsSDK, but it links anyway. If there ends up being
+        # Windows targets without this, another means to detect it is needed.
+        set(EXTRA_LIBS winmm ${EXTRA_LIBS})
     endif()
 
     # Check DSound backend
-    find_package(DSound)
-    if(DSOUND_FOUND)
+    check_include_file(dsound.h HAVE_DSOUND_H)
+    if(DXSDK_DIR)
+        find_path(DSOUND_INCLUDE_DIR NAMES "dsound.h"
+            PATHS "${DXSDK_DIR}" PATH_SUFFIXES include
+            DOC "The DirectSound include directory")
+    endif()
+    if(HAVE_DSOUND_H OR DSOUND_INCLUDE_DIR)
         option(ALSOFT_BACKEND_DSOUND "Enable DirectSound backend" ON)
         if(ALSOFT_BACKEND_DSOUND)
             set(HAVE_DSOUND 1)
-            set(BACKENDS  "${BACKENDS} DirectSound${IS_LINKED},")
-            set(ALC_OBJS  ${ALC_OBJS} alc/backends/dsound.cpp alc/backends/dsound.h)
-            add_backend_libs(${DSOUND_LIBRARIES})
-            set(INC_PATHS ${INC_PATHS} ${DSOUND_INCLUDE_DIRS})
+            set(BACKENDS "${BACKENDS} DirectSound,")
+            set(ALC_OBJS ${ALC_OBJS} alc/backends/dsound.cpp alc/backends/dsound.h)
+
+            if(NOT HAVE_DSOUND_H)
+                set(INC_PATHS ${INC_PATHS} ${DSOUND_INCLUDE_DIR})
+            endif()
         endif()
     endif()
 
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