Add t/example, a basic example build environment suitable for a tutorial.

README.md

@@ -64,9 +64,9 @@ But the easiest way to show it is with an example.
 
 Create a file called default.o.do:
 	redo-ifchange $1.c
-	gcc -MD -MF deps.tmp -c -o $3 $1.c
+	gcc -MD -MF $3.deps.tmp -c -o $3 $1.c
-	DEPS=$(sed -e "s/^$3://" -e 's/\\//g' <deps.tmp)
+	DEPS=$(sed -e "s/^$3://" -e 's/\\//g' <$3.deps.tmp)
-	rm -f deps.tmp
+	rm -f $3.deps.tmp
 	redo-ifchange $DEPS
 
 Create a file called myprog.do:

t/all.do

@@ -1,3 +1 @@
-redo-ifchange hello yellow bellow c d
+redo-ifchange hello yellow bellow c d example/all
-
-

t/clean.do

@@ -1,3 +1,2 @@
+redo example/clean
 rm -f c c.c c.c.c c.c.c.b c.c.c.b.b d
-
-

t/example/.gitignore

@@ -0,0 +1,3 @@
+*.o
+CC
+hello

t/example/CC.do

@@ -0,0 +1,10 @@
+redo-ifchange config.sh
+. ./config.sh
+cat <<-EOF
+	redo-ifchange \$1.c
+	gcc -MD -MF \$3.deps.tmp -o \$3 -c \$1.c
+	DEPS=\$(sed -e "s/^\$3://" -e 's/\\\\//g' <\$3.deps.tmp)
+	rm -f \$3.deps.tmp
+	redo-ifchange \$DEPS
+EOF
+chmod +x $3

t/example/Makefile

@@ -0,0 +1,6 @@
+all:
+
+%: FORCE
+	+redo $@
+
+.PHONY: FORCE

t/example/all.do

@@ -0,0 +1 @@
+redo-ifchange hello

t/example/clean.do

@@ -0,0 +1 @@
+rm -f *.tmp *~ *.o hello CC

t/example/config.sh

@@ -0,0 +1 @@
+CFLAGS="-Wall"

t/example/default.o.do

@@ -0,0 +1,2 @@
+redo-ifchange CC
+. ./CC "$@"

t/example/hello.do

@@ -0,0 +1,4 @@
+DEPS="main.o
+mystr.o"
+redo-ifchange $DEPS
+gcc -o $3 $DEPS

t/example/main.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+#include "mystr.h"
+
+int main()
+{
+    printf("%s\n", mystr);
+    return 0;
+}

t/example/mystr.c

@@ -0,0 +1,4 @@
+
+#include "mystr.h"
+
+char *mystr = "Hello, world!";

t/example/mystr.h

@@ -0,0 +1,6 @@
+#ifndef __MYSTR_H
+#define __MYSTR_H
+
+extern char *mystr;
+
+#endif