Use ack -mcpm -fp for mandelbrot.c, startrek.c

Add a variable %{ackldflags} so I can pass `-fp`.  This change seems
to cause the build to relink every ackprogram, because the link now
needs to use %{ackldflags} even if the flags are empty.

mandelbrot_c_cpm runs in YAZE-AG; startrek_c_cpm doesn't run because
it doesn't fit in the 16-bit address space.

build.lua

@@ -4,6 +4,7 @@ vars.cflags = {
 vars.ackcflags = {
 	"-O6"
 }
+vars.ackldflags = {}
 vars.plats = {
 	"cpm",
 	"linux386",

examples/build.lua

@@ -4,6 +4,10 @@ local conly = {
 	rpi = true
 }
 
+local softfp = {
+	cpm = true,
+}
+
 local sourcefiles = filenamesof(
 	"./hilo.b",
 	"./hilo.bas",
@@ -15,6 +19,11 @@ local sourcefiles = filenamesof(
 	"./startrek.c"
 )
 
+local usesfp = {
+	["mandelbrot.c"] = true,
+	["startrek.c"] = true,
+}
+
 local installmap = {}
 for _, file in ipairs(sourcefiles) do
 	local b = basename(file)
@@ -22,6 +31,12 @@ for _, file in ipairs(sourcefiles) do
 	local _, _, e = b:find("%.(%w*)$")
 
 	for _, plat in ipairs(vars.plats) do
+		local flags = {}
+
+		if softfp[plat] and usesfp[b] then
+			flags[#flags+1] = "-fp"
+		end
+
 		if (e == "c") or not conly[plat] then
 			local exe = ackprogram {
 				name = be.."_"..plat,
@@ -29,6 +44,7 @@ for _, file in ipairs(sourcefiles) do
 				vars = {
 					plat = plat,
 					lang = e,
+					["+ackldflags"] = flags,
 				}
 			}
 

plat/build.lua

@@ -91,7 +91,7 @@ definerule("ackprogram",
 			},
 			_clibrary = acklibrary,
 			commands = {
-				"ACKDIR=$(INSDIR) $(INSDIR)/bin/ack -m%{plat} -.%{lang} -o %{outs} %{ins}"
+				"ACKDIR=$(INSDIR) $(INSDIR)/bin/ack -m%{plat} -.%{lang} -o %{outs} %{ins} %{ackldflags}"
 			}
 		}
 	end