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two-stage build

we build a bootstrap version of zuo that relies on the libraries in
"./lib" to function. we then generate an embedded image that contains
all of those libraries and build that as the final "zuo" executable.

this allows us to install it without needing to copy around extra
library files, and also allows zuo to still pick up extra library
files from "./lib" if present.

thanks to phil9 for pinging me to make it installable.

--- a/.gitignore

+++ b/.gitignore

@@ -3,6 +3,8 @@

 /zuo.exe

 /zuo.obj

 /zuo.o

+/zuo.0

+/zuo_image.c

 /build

--- a/mkfile

+++ b/mkfile

@@ -1,7 +1,18 @@

 all:V: zuo

-zuo: zuo.c

-	pcc -D_PLAN9_SOURCE -o zuo zuo.c

+zuo: zuo_image.c

+	pcc -D_PLAN9_SOURCE -o zuo zuo_image.c

+zuo.0: zuo.c

+	pcc -D_PLAN9_SOURCE -o zuo.0 zuo.c

+

+zuo_image.c: zuo.0

+	./zuo.0 local/image.zuo -o zuo_image.c ++lib zuo \

+		`{for(i in `{walk -f -n1,1 lib/zuo}) echo ++lib zuo/^`{basename $i .zuo}}

+

+install:V: zuo

+	chmod 755 zuo

+	cp zuo /$objtype/bin/zuo

+

 clean:V:

-	rm -f zuo

+	rm -f zuo zuo.0 zuo_image.c