ci: Build parallel port code on supported systems

Build parallel port code on supported systems

Unsupported systems are:

  * Windows operating system
  * MacOS operating system

This means the CI can test

  * native Linux builds (yes, even for arm systems)

Untested at this time are the BSDs.

Removes the dysfunctional Windows (since Windows XP)  parallel port code,
and has the buildsystems fail Windows builds if parallel port builds are
requested (HAVE_PARPORT or --enable-parport).

#1874 (comment)

.github/workflows/build.yml

@@ -105,6 +105,7 @@ jobs:
           cmake
           -D BUILD_DOC=1
           -D DEBUG_CMAKE=1
+          -D HAVE_PARPORT=1
           -D HAVE_LINUXGPIO=1
           -D HAVE_LINUXSPI=1
           -D CMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
@@ -169,6 +170,7 @@ jobs:
         run: >-
           cmake
           -D DEBUG_CMAKE=1
+          -D HAVE_PARPORT=1
           -D HAVE_LINUXGPIO=1
           -D HAVE_LINUXSPI=1
           -D CMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}

CMakeLists.txt

@@ -352,6 +352,14 @@ if(BUILD_DOC)
     add_subdirectory(src/doc)
 endif()
 
+if(HAVE_PARPORT)
+  if(WIN32)
+    message(FATAL_ERROR "avrdude does not support parallel port on Windows")
+  elseif(APPLE)
+    message(FATAL_ERROR "avrdude does not support parallel port on Apple systems")
+  endif()
+endif()
+
 # =====================================
 # Configuration
 # =====================================

src/CMakeLists.txt

@@ -236,7 +236,6 @@ set(SOURCES
     pindefs.c
     ppi.c
     ppi.h
-    ppiwin.c
     serbb.h
     serbb_posix.c
     serbb_win32.c

src/Makefile.am

@@ -163,7 +163,6 @@ libavrdude_la_SOURCES = \
 	pindefs.c \
 	ppi.c \
 	ppi.h \
-	ppiwin.c \
 	serbb.h \
 	serbb_posix.c \
 	serbb_win32.c \

src/configure.ac

@@ -449,6 +449,17 @@ AC_ARG_ENABLE(
 		esac],
 	[enabled_parport=no])
 
+AS_IF([test "x$enabled_parport" = xyes], [dnl
+  case $target in
+        *-*-mingw32* | *-*-cygwin* | *-*-windows*)
+	  AC_MSG_ERROR([avrdude does not support parallel port on Windows])
+	;;
+        *-*-darwin*)
+	  AC_MSG_ERROR([avrdude does not support parallel port on MacOS])
+	;;
+  esac
+])
+
 AC_ARG_ENABLE(
 	[linuxgpio],
 	AS_HELP_STRING([--enable-linuxgpio],