Build (but don't use) libfp for cpm.

This library is for software floating point.  The i80 back end has
never implemented floating point, and might not be ready for libfp.
This commit only builds libfp without using it.

I edit first/build.lua and plat/build.lua to allow `ack -c.s`, then
use FP.script to edit the assembly code.  I edit FP.script so it
writes the edited assembly code to stdout, not to the input file.

first/build.lua

@@ -40,6 +40,7 @@ definerule("cfile",
 	{
 		srcs = { type="targets" },
 		deps = { type="targets", default={} },
+		suffix = { type="string", default=".o" },
 		commands = {
 			type="strings",
 			default={
@@ -56,7 +57,7 @@ definerule("cfile",
 		end
 		hdrpaths = uniquify(hdrpaths)
 
-		local outleaf = basename(e.name)..".o"
+		local outleaf = basename(e.name)..e.suffix
 
 		return normalrule {
 			name = e.name,

mach/proto/fp/FP.script

@@ -37,5 +37,5 @@ g/_b64_add/s//.b64_add/g
 g/_b64_sft/s//.b64_sft/g
 g/_b64_rsft/s//.b64_rsft/g
 g/_b64_lsft/s//.b64_lsft/g
-w
+1,$p
 q

mach/proto/fp/build.lua

@@ -0,0 +1,53 @@
+include("plat/build.lua")
+
+-- For now, all floats are little-endian.
+local byte_order = "mach/i86/libfp/byte_order.h"
+
+-- For now, only cpm uses software floating-point.
+for _, plat in ipairs({"cpm"}) do
+	local edits = {}
+	for _, src in fpairs("./*.c", "./*.e") do
+
+		-- Compile each src file into assembly code.
+		local n = basename(src):gsub("%.%w*$", "")
+		local assembly = ackfile {
+			name = "s_"..plat.."/"..n,
+			srcs = { src },
+			deps = {
+				"./*.h",
+				byte_order,
+			},
+			suffix = ".s",
+			vars = {
+				ackcflags = "-I"..dirname(byte_order),
+				plat = plat
+			}
+		}
+
+		-- Run FP.script to edit the assembly code.
+		edits[#edits+1] = normalrule {
+			name = "ed_"..plat.."/"..n,
+			ins = {
+				"./FP.script",
+				assembly,
+			},
+			outleaves = { n..".s" },
+			commands = {
+				"ed -s %{ins[2]} <%{ins[1]} >%{outs}"
+			}
+		}
+	end
+
+	acklibrary {
+		name = "lib_"..plat,
+		srcs = { edits },
+		vars = { plat = plat }
+	}
+
+	installable {
+		name = "pkg_"..plat,
+		map = {
+			["$(PLATIND)/"..plat.."/libfp.a"] = "+lib_"..plat,
+		}
+	}
+end

plat/build.lua

@@ -8,8 +8,10 @@ definerule("ackfile",
 	{
 		srcs = { type="targets" },
 		deps = { type="targets", default={} },
+		suffix = { type="string", default=".o" },
 	},
 	function (e)
+		local c = (e.suffix == ".o" and "-c" or "-c"..e.suffix)
 		local plat = e.vars.plat
 
 		return cfile {
@@ -28,8 +30,9 @@ definerule("ackfile",
 				"util/misc+pkg",
 				e.deps
 			},
+			suffix = e.suffix,
 			commands = {
-				"ACKDIR=$(INSDIR) $(INSDIR)/bin/ack -m%{plat} -c -o %{outs} %{ins} %{hdrpaths} %{ackcflags}"
+				"ACKDIR=$(INSDIR) $(INSDIR)/bin/ack -m%{plat} "..c.." -o %{outs} %{ins} %{hdrpaths} %{ackcflags}"
 			}
 		}
 	end
@@ -100,9 +103,7 @@ definerule("build_plat_libs",
 		plat = { type="string" },
 	},
 	function(e)
-		return installable {
-			name = e.name,
-			map = {
+		local installmap = {
 			"lang/b/lib+pkg_"..e.plat,
 			"lang/basic/lib+pkg_"..e.plat,
 			"lang/cem/libcc.ansi+pkg_"..e.plat,
@@ -112,6 +113,15 @@ definerule("build_plat_libs",
 			["$(PLATIND)/"..e.plat.."/libem.a"] = "mach/"..e.arch.."/libem+lib_"..e.plat,
 			["$(PLATIND)/"..e.plat.."/libend.a"] = "mach/"..e.arch.."/libend+lib_"..e.plat,
 		}
+
+		-- For now, only cpm uses software floating-point.
+		if e.plat == "cpm" then
+			installmap[#installmap+1] = "mach/proto/fp+pkg_"..e.plat
+		end
+
+		return installable {
+			name = e.name,
+			map = installmap,
 		}
 	end
 )