From 0ab583d78770b1e8babe83924321881b0710b420 Mon Sep 17 00:00:00 2001
From: Jiri Malak <malak.jiri@gmail.com>
Date: Fri, 1 May 2020 16:03:48 +0200
Subject: OpenWatcom: Add DOS target support

DOS 16-bit and 32-bit target support files for cross-compilation by
OpenWatcom.

It is used if CMAKE_SYSTEM_NAME=DOS is defined.

If CMAKE_SYSTEM_PROCESSOR=I86 is defined then 16-bit DOS target is used,
otherwise 32-bit DOS target is used.
---
 Modules/Platform/DOS-OpenWatcom-C.cmake   |  1 +
 Modules/Platform/DOS-OpenWatcom-CXX.cmake |  1 +
 Modules/Platform/DOS-OpenWatcom.cmake     | 28 ++++++++++++++++++++++++++++
 Modules/Platform/DOS.cmake                | 14 ++++++++++++++
 4 files changed, 44 insertions(+)
 create mode 100644 Modules/Platform/DOS-OpenWatcom-C.cmake
 create mode 100644 Modules/Platform/DOS-OpenWatcom-CXX.cmake
 create mode 100644 Modules/Platform/DOS-OpenWatcom.cmake
 create mode 100644 Modules/Platform/DOS.cmake

diff --git a/Modules/Platform/DOS-OpenWatcom-C.cmake b/Modules/Platform/DOS-OpenWatcom-C.cmake
new file mode 100644
index 0000000..cf71c84
--- /dev/null
+++ b/Modules/Platform/DOS-OpenWatcom-C.cmake
@@ -0,0 +1 @@
+include(Platform/DOS-OpenWatcom)
diff --git a/Modules/Platform/DOS-OpenWatcom-CXX.cmake b/Modules/Platform/DOS-OpenWatcom-CXX.cmake
new file mode 100644
index 0000000..cf71c84
--- /dev/null
+++ b/Modules/Platform/DOS-OpenWatcom-CXX.cmake
@@ -0,0 +1 @@
+include(Platform/DOS-OpenWatcom)
diff --git a/Modules/Platform/DOS-OpenWatcom.cmake b/Modules/Platform/DOS-OpenWatcom.cmake
new file mode 100644
index 0000000..54c452e
--- /dev/null
+++ b/Modules/Platform/DOS-OpenWatcom.cmake
@@ -0,0 +1,28 @@
+
+# This module is shared by multiple languages; use include blocker.
+include_guard()
+
+set(CMAKE_BUILD_TYPE_INIT Debug)
+
+if(DEFINED CMAKE_SYSTEM_PROCESSOR AND CMAKE_SYSTEM_PROCESSOR STREQUAL "I86")
+  string(APPEND CMAKE_EXE_LINKER_FLAGS_INIT " system dos")
+  string(APPEND CMAKE_SHARED_LINKER_FLAGS_INIT " system dos")
+  string(APPEND CMAKE_MODULE_LINKER_FLAGS_INIT " system dos")
+else()
+  string(APPEND CMAKE_EXE_LINKER_FLAGS_INIT " system dos4g")
+  string(APPEND CMAKE_SHARED_LINKER_FLAGS_INIT " system dos4g")
+  string(APPEND CMAKE_MODULE_LINKER_FLAGS_INIT " system dos4g")
+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.
+
+string(APPEND CMAKE_C_FLAGS_INIT " -bt=dos")
+string(APPEND CMAKE_CXX_FLAGS_INIT " -bt=dos -xs")
+
+if(NOT CMAKE_C_STANDARD_INCLUDE_DIRECTORIES)
+  set(CMAKE_C_STANDARD_INCLUDE_DIRECTORIES $ENV{WATCOM}/h)
+endif()
+if(NOT CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES)
+  set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES $ENV{WATCOM}/h)
+endif()
diff --git a/Modules/Platform/DOS.cmake b/Modules/Platform/DOS.cmake
new file mode 100644
index 0000000..fc95936
--- /dev/null
+++ b/Modules/Platform/DOS.cmake
@@ -0,0 +1,14 @@
+set(DOS 1)
+
+set(CMAKE_STATIC_LIBRARY_PREFIX "")
+set(CMAKE_STATIC_LIBRARY_SUFFIX ".lib")
+set(CMAKE_SHARED_LIBRARY_PREFIX "")
+set(CMAKE_SHARED_LIBRARY_SUFFIX ".dll")
+set(CMAKE_IMPORT_LIBRARY_PREFIX "")
+set(CMAKE_IMPORT_LIBRARY_SUFFIX ".lib")
+set(CMAKE_EXECUTABLE_SUFFIX ".exe")
+set(CMAKE_LINK_LIBRARY_SUFFIX ".lib")
+set(CMAKE_DL_LIBS "")
+
+set(CMAKE_FIND_LIBRARY_PREFIXES "")
+set(CMAKE_FIND_LIBRARY_SUFFIXES ".lib")
-- 
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