Make examples' shebang use target tcc bindir path

Use @BINDIR@ in shebang of examples to put the right path on the target
system. That is, use #!/usr/local/bin/tcc if tcc is installed in /usr/local/bin
and #!/usr/bin/tcc if tcc is installed in /usr/bin/tcc.

Makefile

@@ -141,15 +141,16 @@ ifdef CONFIG_USE_LIBGCC
 LIBTCC1=
 endif
 
-TCCLIBS = $(LIBTCC1) $(LIBTCC) $(BCHECK_O)
-TCCDOCS = tcc.1 tcc-doc.html tcc-doc.info
+TCCLIBS := $(LIBTCC1) $(LIBTCC) $(BCHECK_O)
+TCCDOCS := tcc.1 tcc-doc.html tcc-doc.info
+TCCEXS := $(patsubst ex%.c.template,ex%.c,$(wildcard examples/ex*.c.template))
 
 ifdef CONFIG_CROSS
 PROGS+=$(PROGS_CROSS)
 TCCLIBS+=$(LIBTCC1_CROSS)
 endif
 
-all: $(PROGS) $(TCCLIBS) $(TCCDOCS)
+all: $(PROGS) $(TCCLIBS) $(TCCDOCS) $(TCCEXS)
 
 # Host Tiny C Compiler
 tcc$(EXESUF): tcc.o $(LIBTCC)
@@ -324,6 +325,11 @@ tcc.1: tcc-doc.texi
 tcc-doc.info: tcc-doc.texi
 	-makeinfo tcc-doc.texi
 
+# examples
+examples/ex%.c: examples/ex%.c.template
+	sed '1s/@BINDIR@/$(subst /,\/,$(bindir))/' $< > $@
+	chmod a+x $@
+
 .PHONY: all clean tar distclean install uninstall FORCE
 
 # tar release (use 'make -k tar' on a checkouted tree)
@@ -341,7 +347,7 @@ export LIBTCC1
 	$(MAKE) -C tests $@
 
 clean:
-	rm -vf $(PROGS) tcc_p$(EXESUF) tcc.pod *~ *.o *.a *.so* *.out *.exe libtcc_test$(EXESUF)
+	rm -vf $(PROGS) tcc_p$(EXESUF) tcc.pod *~ *.o *.a *.so* *.out *.exe libtcc_test$(EXESUF) $(TCCEXS)
 	$(MAKE) -C tests $@
 ifneq ($(LIBTCC1),)
 	$(MAKE) -C lib $@

README

@@ -65,7 +65,8 @@ operations given a list of numbers (benchmark).
 ex3.c: compute fibonacci numbers (benchmark).
 
 ex4.c: more complicated: X11 program. Very complicated test in fact
-because standard headers are being used !
+because standard headers are being used ! As for ex1.c, can also be launched
+directly as a script: './ex4.c'.
 
 ex5.c: 'hello world' with standard glibc headers.
 

examples/ex1.c.template

@@ -1,4 +1,4 @@
-#! /usr/local/bin/tcc -run
+#! @BINDIR@/tcc -run
 #include <tcclib.h>
 
 int main()

examples/ex4.c.template

@@ -1,4 +1,4 @@
-#!./tcc -run -L/usr/X11R6/lib -lX11
+#! @BINDIR@/tcc -run -L/usr/X11R6/lib -lX11
 #include <stdlib.h>
 #include <stdio.h>
 #include <X11/Xlib.h>