Nachbereitung 12.12.2019

20191212/Makefile-0

+hello-6: hello-6.o pruzzel.o
+	gcc hello-6.o pruzzel.o -o hello-6
+
+hello-6.o: hello-6.c
+	gcc -Wall -O hello-6.c -c
+
+pruzzel.o: pruzzel.c
+	gcc -Wall -O pruzzel.c -c

20191212/Makefile-1

+hello-6: hello-6.o pruzzel.o
+	gcc hello-6.o pruzzel.o -o hello-6
+
+hello-6.o: hello-6.c pruzzel.h
+	gcc -Wall -O hello-6.c -c
+
+pruzzel.o: pruzzel.c pruzzel.h
+	gcc -Wall -O pruzzel.c -c

20191212/Makefile-2

+TARGET = hello-6
+OBJECTS = hello-6.o pruzzel.o
+HEADERS = pruzzel.h
+CFLAGS = -Wall -O
+
+$(TARGET): $(OBJECTS)
+	gcc $(OBJECTS) -o $(TARGET)
+
+%.o: %.c $(HEADERS)
+	gcc $(CFLAGS) $< -c
+
+clean:
+	rm -f $(OBJECTS) $(TARGET)

20191212/blink-3.c

+#include <avr/io.h>
+
+#define F_CPU 16000000
+#include <util/delay.h>
+
+int main (void)
+{
+  DDRD = 0x01;
+  PORTD = 0x01;
+  while (1)
+    {
+      while ((PIND & 0x02) == 0)
+        ; /* just wait */
+      PORTD ^= 0x01;
+    }
+  return 0;
+}

20191212/hello-6.c

+#include "pruzzel.h"
+
+int main (void)
+{
+  pruzzel ("Hello, world!\n");
+  return 0;
+}

20191212/hp-20191212.tex

@@ -524,6 +524,8 @@
 
 \end{frame}
 
+\iffalse
+
 \subsection{Binärdarstellung negativer Zahlen}
 
 \begin{frame}[fragile]
@@ -709,4 +711,6 @@
 
 \end{frame}
 
+\fi
+
 \end{document}

20191212/make-1.txt

+cassini/home/peter/bo/2019ws/hp/20191212> cat Makefile
+hello-6: hello-6.o pruzzel.o
+        gcc hello-6.o pruzzel.o -o hello-6
+
+hello-6.o: hello-6.c
+        gcc -Wall -O hello-6.c -c
+
+pruzzel.o: pruzzel.c
+        gcc -Wall -O pruzzel.c -c
+cassini/home/peter/bo/2019ws/hp/20191212> make
+make: „hello-6“ ist bereits aktuell.
+cassini/home/peter/bo/2019ws/hp/20191212> rm hello-6
+cassini/home/peter/bo/2019ws/hp/20191212> make
+gcc hello-6.o pruzzel.o -o hello-6
+cassini/home/peter/bo/2019ws/hp/20191212> rm hello-6 *.o
+cassini/home/peter/bo/2019ws/hp/20191212> make
+gcc -Wall -O hello-6.c -c
+gcc -Wall -O pruzzel.c -c
+gcc hello-6.o pruzzel.o -o hello-6
+cassini/home/peter/bo/2019ws/hp/20191212> ./hello-6
+Hello, world!
+cassini/home/peter/bo/2019ws/hp/20191212> ls -l pruzzel.c
+-rw-r--r-- 1 peter peter 89 Nov 21 17:08 pruzzel.c
+cassini/home/peter/bo/2019ws/hp/20191212> touch pruzzel.c
+cassini/home/peter/bo/2019ws/hp/20191212> ls -l pruzzel.c
+-rw-r--r-- 1 peter peter 89 Dez 12 16:26 pruzzel.c
+cassini/home/peter/bo/2019ws/hp/20191212> make
+gcc -Wall -O pruzzel.c -c
+gcc hello-6.o pruzzel.o -o hello-6
+cassini/home/peter/bo/2019ws/hp/20191212> mv -i Makefile Makefile-1
+cassini/home/peter/bo/2019ws/hp/20191212> make -f Makefile-1
+make: „hello-6“ ist bereits aktuell.
+cassini/home/peter/bo/2019ws/hp/20191212>

20191212/pruzzel.c

+#include <stdio.h>
+
+int pruzzel (const char *bla)
+{
+  printf ("%s", bla);
+  return 42;
+}

20191212/pruzzel.h

+extern int pruzzel (const char *bla);