autotools: create executables with both .exe and .com extensions - exe

Question

On W32 (and when cross-compiling for W32 from a linux system) I'd like to have automake build two executables from the same Makefile.am that differ in their extension.
E.g.
- foo.exe
- foo.com
Since automake magically handles the extension, i don't really see how to achieve that. E.g.
bin_PROGRAMS=foo foo.com
foo_SOURCES=foo.c
foo_com_SOURCES=foo.c
Will happily produce two binaries foo.exe and foo.com.exe :-(
The best I've come up so far with is:
AUTOMAKE_OPTIONS = no-exeext
bin_PROGRAMS=foo
noinst_PROGRAMS=foocom
bin_SCRIPTS=foo.com
foo_SOURCES=foo.c flub.c
foocom_SOURCES=foo.c knark.c
clean-local:
-rm -rf foo.com
foo.com: foocom$(EXEEXT)
cp $^ $#
Could I expect more?
Background
I'm building a cross-platform application (let's call it foo), with an automake-based buildsystem.
On un*x-like systems, the application stays in the foreground (and outputs to stdout/stderr).
On W32 this is usually unwanted (as it would require the application to be a Console Application with an ugly console-window to stay open while the application is running). Sometimes it is wanted though (e.g. for debugging).
The solution currently applied (with a non-automake based build-system on W32) is to build the same application both as foo.exe (a native W32 application), and foo.com (a Console Application).

Answer 1

I would basically use the best you have come up with with a few quite small changes:
AM_INSTALLCHECK_STD_OPTIONS_EXEMPT =
CLEANFILES =
bin_PROGRAMS =
noinst_PROGRAMS =
bin_SCRIPTS =
common_sources =
common_sources += foo.c
if BUILD_FOR_WINDOWS
AM_INSTALLCHECK_STD_OPTIONS_EXEMPT += foo$(EXEEXT)
bin_PROGRAMS += foo
foo_CFLAGS = -mwindows
foo_SOURCES = foo-windows.c
foo_SOURCES += $(common_sources)
AM_INSTALLCHECK_STD_OPTIONS_EXEMPT += foo-console$(EXEEXT)
noinst_PROGRAMS += foo-console
foo_console_CFLAGS = -mconsole
foo_console_SOURCES = foo-console.c
foo_console_SOURCES += $(common_sources)
CLEANFILES += foo.com
AM_INSTALLCHECK_STD_OPTIONS_EXEMPT += foo.com
bin_SCRIPTS += foo.com
foo.com: foo-console$(EXEEXT)
cp $^ $#
endif
List of changes:
Removed AUTOMAKE_OPTIONS = no-exeext which appears unnecessary.
Use CLEANFILES instead of hooking into clean-local.
Reformat for easy patching by adding/removing lines.
Add an AM_CONDITIONAL to build these windows specific programs if and only if you are actually building for a windows target. (For a MacOSX or GNU/Linux target, you would need to write and build very different programs.)
# Add this to configure.ac
build_for_windows=no
case "${host_os}" in
cygwin*|mingw*)
build_for_windows=yes
;;
esac
AM_CONDITIONAL([BUILD_FOR_WINDOWS],
[test "x$build_for_windows" = "xyes"])