add DOS Watcom support

.github/workflows/ci.yml

@@ -112,3 +112,20 @@ jobs:
       with:
         name: binary-archive
         path: build/package
+
+  dos:
+    timeout-minutes: 10
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: open-watcom/setup-watcom@v0
+      with:
+        version: "2.0"
+
+    - uses: actions/checkout@v2
+
+    - name: Configure
+      run: cmake -Bbuild --toolchain cmake/dos.cmake
+
+    - name: Build
+      run: cmake --build build

CMakeLists.txt

@@ -72,6 +72,9 @@ elseif(WIN32)
   target_sources(pdcurses PRIVATE wincon/pdcclip.c wincon/pdcdisp.c wincon/pdcgetsc.c
     wincon/pdckbd.c wincon/pdcscrn.c wincon/pdcsetsc.c wincon/pdcutil.c wincon/pdcwin.h
   )
+elseif(CMAKE_SYSTEM_NAME STREQUAL "DOS")
+  target_sources(pdcurses PRIVATE dos/pdcclip.c dos/pdcdisp.c dos/pdcgetsc.c
+      dos/pdckbd.c dos/pdcscrn.c dos/pdcsetsc.c dos/pdcutil.c)
 else()
   check_include_file("DECkeySym.h" HAVE_DECKEYSYM_H)
   check_include_file("Sunkeysym.h" HAVE_SUNKEYSYM_H)

cmake/compilers.cmake

@@ -9,4 +9,14 @@ $<$<BOOL:${HAVE_VSSCANF}>:HAVE_VSSCANF>
 )
 
 # --- compiler options
-add_compile_options(-Wall)
+
+if(CMAKE_C_COMPILER_ID STREQUAL OpenWatcom)
+  message(STATUS "OpenWatcom: $ENV{WATCOM}
+  Host: ${CMAKE_HOST_SYSTEM_NAME} ${CMAKE_HOST_SYSTEM_VERSION}
+  Target: ${CMAKE_SYSTEM_NAME} ${CMAKE_SYSTEM_VERSION}
+  ")
+  # https://wiki.archlinux.org/title/Open_Watcom
+  add_compile_options(pdcurses PRIVATE -bt=dos -bcl=dos)
+else()
+  add_compile_options(-Wall)
+endif()

cmake/dos.cmake

@@ -0,0 +1,28 @@
+set(CMAKE_SYSTEM_NAME DOS)
+set(CMAKE_GENERATOR "Watcom WMake")
+
+if(NOT DEFINED ENV{WATCOM})
+  if(WIN32)
+    set(scr ${CMAKE_CURRENT_LIST_DIR}/dos.ps1)
+  else()
+    set(scr ${CMAKE_CURRENT_LIST_DIR}/dos.sh)
+  endif()
+  message(FATAL_ERROR "WATCOM environment variable not set. Try running ${scr} first.")
+endif()
+
+file(TO_CMAKE_PATH "$ENV{WATCOM}" watcom_root)
+
+set(CMAKE_SYSROOT ${watcom_root})
+
+if(WIN32)
+  set(bin ${watcom_root}/binnt64 ${watcom_root}/binnt)
+else()
+  set(bin ${watcom_root}/binl64 ${watcom_root}/binl)
+endif()
+
+find_program(CMAKE_C_COMPILER
+NAMES wcl386
+HINTS ${bin}
+NO_DEFAULT_PATH
+REQUIRED
+)

cmake/dos.ps1

@@ -0,0 +1,15 @@
+$watcom = "$Env:SYSTEMDRIVE:\WATCOM"
+
+if (!(Test-Path -Path $watcom)) {
+  Throw "OpenWatcom not found at $watcom"
+}
+
+$env:WATCOM = $watcom
+$env:EDPATH = "$watcom\EDDAT"
+$env:WHTMLHELP = "$watcom\BINNT\HELP"
+$env:WIPFC = "$watcom\WIPFC"
+
+$env:LIBPATH = "$watcom\lib386\"
+$env:INCLUDE = "$watcom\H"
+
+$env:Path += ";$watcom\BINNT64;$watcom\BINNT"

cmake/dos.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+watcom="/opt/watcom/"
+
+if [ ! -d $watcom ]; then
+  echo "OpenWatcom not found at $watcom" >&2
+  exit 1
+fi
+
+export WATCOM=$watcom
+export EDPATH="$watcom/eddat"
+export WIPFC="$watcom/wipfc"
+
+export INCLUDE="$watcom/h"
+export PATH="$watcom/binl64:$watcom/binl:$PATH"

cmake/x11.cmake

@@ -8,6 +8,9 @@ if(PKG_CONFIG_FOUND)
 
 pkg_check_modules(_xt xt)
 pkg_check_modules(_x11 x11)
+pkg_check_modules(_xmu xmu)
+pkg_check_modules(_xpm xpm)
+pkg_check_modules(_xaw xaw7)
 
 endif()
 
@@ -27,8 +30,35 @@ PATH_SUFFIXES X11
 REQUIRED
 )
 
+# macOS may need this
+find_path(_xmu_inc
+NAMES StdSel.h
+HINTS ${_xmu_INCLUDE_DIRS} ${X11_INCLUDE_DIR}
+PATH_SUFFIXES X11/Xmu
+REQUIRED
+)
+
+# macOS may need this
+find_path(_xpm_inc
+NAMES xpm.h
+HINTS ${_xpm_INCLUDE_DIRS} ${X11_INCLUDE_DIR}
+PATH_SUFFIXES X11
+REQUIRED
+)
+
+# macOS may need this
+find_path(_xaw_inc
+NAMES Box.h
+HINTS ${_xaw_INCLUDE_DIRS} ${X11_INCLUDE_DIR}
+PATH_SUFFIXES X11/Xaw
+REQUIRED
+)
+
 list(APPEND X11_INCLUDE_DIR
 ${_xt_inc} ${_xatom_inc}
+${_xmu_inc} ${_xmu_inc}/..
+${_xpm_inc}
+${_xaw_inc} ${_xaw_inc}/..
 )
 
 message(STATUS "X11_INCLUDE_DIR: ${X11_INCLUDE_DIR}