OpenWatcom: Add support for 16-bit Windows

Add support for NE Win16 binaries.  We already support 16-bit DOS and OS/2.

1 files changed, 38 insertions, 9 deletions

diff --git a/Modules/Platform/Windows-OpenWatcom.cmake b/Modules/Platform/Windows-OpenWatcom.cmake
index 657a923..4e73160 100644
--- a/Modules/Platform/Windows-OpenWatcom.cmake
+++ b/Modules/Platform/Windows-OpenWatcom.cmake
@@ -6,8 +6,13 @@ include_guard()
 
 set(CMAKE_BUILD_TYPE_INIT Debug)
 
-string(APPEND CMAKE_SHARED_LINKER_FLAGS_INIT " system nt_dll")
-string(APPEND CMAKE_MODULE_LINKER_FLAGS_INIT " system nt_dll")
+if(DEFINED CMAKE_SYSTEM_PROCESSOR AND CMAKE_SYSTEM_PROCESSOR STREQUAL "I86")
+  string(APPEND CMAKE_SHARED_LINKER_FLAGS_INIT " system windows")
+  string(APPEND CMAKE_MODULE_LINKER_FLAGS_INIT " system windows")
+else()
+  string(APPEND CMAKE_SHARED_LINKER_FLAGS_INIT " system nt_dll")
+  string(APPEND CMAKE_MODULE_LINKER_FLAGS_INIT " system nt_dll")
+endif()
 
 set(CMAKE_C_COMPILE_OPTIONS_DLL "-bd") # Note: This variable is a ';' separated list
 set(CMAKE_SHARED_LIBRARY_C_FLAGS "-bd") # ... while this is a space separated string.
@@ -23,22 +28,45 @@ else()
   set(_br_bm "-br -bm")
 endif()
 
-string(APPEND CMAKE_C_FLAGS_INIT " -bt=nt -dWIN32 ${_br_bm}")
-string(APPEND CMAKE_CXX_FLAGS_INIT " -bt=nt -xs -dWIN32 ${_br_bm}")
+if(DEFINED CMAKE_SYSTEM_PROCESSOR AND CMAKE_SYSTEM_PROCESSOR STREQUAL "I86")
+  string(APPEND CMAKE_C_FLAGS_INIT " -bt=windows ")
+  string(APPEND CMAKE_CXX_FLAGS_INIT " -bt=windows ")
+else()
+  string(APPEND CMAKE_C_FLAGS_INIT " -bt=nt -dWIN32 ${_br_bm}")
+  string(APPEND CMAKE_CXX_FLAGS_INIT " -bt=nt -xs -dWIN32 ${_br_bm}")
+endif()
 
 unset(__WINDOWS_WATCOM_CMP0136)
 unset(_br_bm)
 
 if(CMAKE_CROSSCOMPILING)
-  if(NOT CMAKE_C_STANDARD_INCLUDE_DIRECTORIES)
-    set(CMAKE_C_STANDARD_INCLUDE_DIRECTORIES $ENV{WATCOM}/h $ENV{WATCOM}/h/nt)
-  endif()
-  if(NOT CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES)
-    set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES $ENV{WATCOM}/h $ENV{WATCOM}/h/nt)
+  if(DEFINED CMAKE_SYSTEM_PROCESSOR AND CMAKE_SYSTEM_PROCESSOR STREQUAL "I86")
+    if(NOT CMAKE_C_STANDARD_INCLUDE_DIRECTORIES)
+      set(CMAKE_C_STANDARD_INCLUDE_DIRECTORIES $ENV{WATCOM}/h $ENV{WATCOM}/h/win)
+    endif()
+    if(NOT CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES)
+      set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES $ENV{WATCOM}/h $ENV{WATCOM}/h/win)
+    endif()
+  else()
+    if(NOT CMAKE_C_STANDARD_INCLUDE_DIRECTORIES)
+      set(CMAKE_C_STANDARD_INCLUDE_DIRECTORIES $ENV{WATCOM}/h $ENV{WATCOM}/h/nt)
+    endif()
+    if(NOT CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES)
+      set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES $ENV{WATCOM}/h $ENV{WATCOM}/h/nt)
+    endif()
   endif()
 endif()
 
 macro(__windows_open_watcom lang)
+if(DEFINED CMAKE_SYSTEM_PROCESSOR AND CMAKE_SYSTEM_PROCESSOR STREQUAL "I86")
+  set(CMAKE_${lang}_CREATE_WIN32_EXE "system windows")
+  set(CMAKE_${lang}_CREATE_CONSOLE_EXE "system windows")
+
+  set(CMAKE_${lang}_COMPILE_OPTIONS_WATCOM_RUNTIME_LIBRARY_SingleThreaded  "")
+  set(CMAKE_${lang}_COMPILE_OPTIONS_WATCOM_RUNTIME_LIBRARY_SingleThreadedDLL "")
+  set(CMAKE_${lang}_COMPILE_OPTIONS_WATCOM_RUNTIME_LIBRARY_MultiThreaded "")
+  set(CMAKE_${lang}_COMPILE_OPTIONS_WATCOM_RUNTIME_LIBRARY_MultiThreadedDLL "")
+else()
   set(CMAKE_${lang}_CREATE_WIN32_EXE "system nt_win")
   set(CMAKE_${lang}_CREATE_CONSOLE_EXE "system nt")
 
@@ -46,4 +74,5 @@ macro(__windows_open_watcom lang)
   set(CMAKE_${lang}_COMPILE_OPTIONS_WATCOM_RUNTIME_LIBRARY_SingleThreadedDLL      -br)
   set(CMAKE_${lang}_COMPILE_OPTIONS_WATCOM_RUNTIME_LIBRARY_MultiThreaded          -bm)
   set(CMAKE_${lang}_COMPILE_OPTIONS_WATCOM_RUNTIME_LIBRARY_MultiThreadedDLL       -bm -br)
+endif()
 endmacro()