build: support macos

Add the bare minimum to make fvwm3 compile on MacOS.  Albeit for
now with some warnings.

configure.ac

@@ -267,18 +267,34 @@ AC_CANONICAL_HOST
 AC_MSG_CHECKING(platform)
 case "$host_os" in
 freebsd*)
+	PLATFORM=freebsd
 	AC_MSG_RESULT(FreeBSD)
 	AC_CHECK_LIB(xpg4, setlocale, [LIBS="$LIBS -lxpg4"])
 	;;
 *openbsd*)
+	PLATFORM=openbsd
 	AC_MSG_RESULT(OpenBSD)
 	CFLAGS="$CFLAGS -I/usr/local/include"
 	LDFLAGS="$LDFLAGS -L/usr/local/lib"
 	;;
+*darwin*)
+	PLATFORM=macos
+	AC_MSG_RESULT(MacOS)
+	;;
 *)
+	PLATFORM=unknown
+	AC_MSG_RESULT(unknown)
 	;;
 esac
 
+AC_SUBST(PLATFORM)
+
+AM_CONDITIONAL([HOST_MACOS], [test "$PLATFORM" = "macos"])
+
+if test "x$PLATFORM" = "xmacos"; then
+AC_DEFINE([HOST_MACOS], [macos], [Host is MacOS])
+fi
+
 PKG_PROG_PKG_CONFIG
 
 PKG_CHECK_MODULES([xt],[xt],
@@ -1359,13 +1375,18 @@ AH_VERBATIM([_ZEND_EXPLICIT_DEFINITIONS],
 #define SUPPRESS_UNUSED_VAR_WARNING(x) \
 do { void *p; p = (void *)&x; (void)p; } while (0);
 
+#ifdef HOST_MACOS
+#undef HAVE_STRLCAT
+#undef HAVE_STRLCPY
+#else
 #ifndef HAVE_STRLCAT
 #   include "libs/strlcat.h"
 #endif
 
 #ifndef HAVE_STRLCPY
 #   include "libs/strlcpy.h"
 #endif
+#endif
 
 #ifndef HAVE_ASPRINTF
 int	asprintf(char **, const char *, ...);
@@ -1488,4 +1509,4 @@ Fvwm3 Configuration:
   Build man pages?                    $with_mandoc$problem_mandoc
   Build html man pages?               $with_htmldoc$problem_htmldoc
 
-"
+"

libs/Makefile.am

@@ -15,7 +15,7 @@ libfvwm3_a_SOURCES = \
 	XError.h XResource.h charmap.h defaults.h envvar.h fio.h flist.h fqueue.h \
 	fsm.h ftime.h fvwm_sys_stat.h fvwm_x11.h fvwmlib.h fvwmrect.h fvwmsignal.h \
 	gravity.c gravity.h getpwuid.h lang-strings.h log.h modifiers.h queue.h \
-	safemalloc.h setpgrp.h strlcat.h strlcpy.h timeout.h vpacket.h wcontext.h wild.h \
+	safemalloc.h setpgrp.h timeout.h vpacket.h wcontext.h wild.h \
 	cJSON.h tree.h strtonum.h \
 	\
 	BidiJoin.c Flocale.c PictureUtils.c FScreen.c Graphics.c \
@@ -27,9 +27,15 @@ libfvwm3_a_SOURCES = \
 	fvwmrect.c FRenderInit.c safemalloc.c  FBidi.c \
 	wild.c Grab.c Event.c ClientMsg.c setpgrp.c FShape.c \
 	FGettext.c Rectangles.c timeout.c flist.c charmap.c wcontext.c \
-	modifiers.c fsm.c FTips.c fio.c fvwmlib3.c strlcat.c strlcpy.c \
+	modifiers.c fsm.c FTips.c fio.c fvwmlib3.c \
 	getpwuid.c cJSON.c strtonum.c
 
+if HOST_MACOS
+foo=
+else
+libfvwm3_a_SOURCES += strlcpy.h strlcat.h strlcpy.c strlcat.c
+endif
+
 libfvwm3_a_LIBADD = @LIBOBJS@
 
 AM_CPPFLAGS = -I$(top_srcdir) $(xpm_CFLAGS) $(Xft_CFLAGS) $(X_CFLAGS) \

modules/FvwmMFL/FvwmMFL.c

@@ -31,7 +31,12 @@
 #include <stdbool.h>
 #include <unistd.h>
 
+#ifdef HOST_MACOS
+#include <event.h>
+#else
 #include <event2/event.h>
+#endif
+
 /* FIXME: including event_struct.h won't be binary comaptible with future
  * versions of libevent.
  */
@@ -898,4 +903,4 @@ int main(int argc, char **argv)
 	unlink(sock_pathname);
 
 	return (0);
-}
+}

modules/FvwmMFL/Makefile.am

@@ -27,4 +27,4 @@ LDADD = -L$(top_builddir)/libs $(X_LIBS) -lfvwm3  \
 	$(X_PRE_LIBS) -lXext -lX11 $(X_EXTRA_LIBS) $(XRandR_LIBS) \
 	$(libevent_LIBS) $(Xft_LIBS)
 
-AM_CPPFLAGS = -I$(top_srcdir) $(X_CFLAGS) $(Xft_CFLAGS)
+AM_CPPFLAGS = -I$(top_srcdir) $(X_CFLAGS) $(Xft_CFLAGS) $(libevent_CFLAGS)