concatenating multiple shell command in a Makefile

Hi I am trying to use the following code in a Makfile to
change into a
directory and to execute Make all after testing the
existence of a
file. However, Make does not seem to like the idea and
report an
unexpected token.
all :
        echo "in the main directory"
        cd dir1  && if [-s toto]; then echo
"toto existe";  else echo
"no
toto"; fi; && $(MAKE) all
could someone help me understanding how to execute multiple
commands
on the same line? I have tried using backticks to quote the
complete
line  or part of it  without success. Thanks for any help.
Guy

nike wrote:
> Hi I am trying to use the following code in a Makfile
to change into a
> directory and to execute Make all after testing the
existence of a
> file. However, Make does not seem to like the idea and
report an
> unexpected token.
> all :
>         echo "in the main directory"
>         cd dir1  && if [-s toto]; then
echo "toto existe";  else echo
> "no
> toto"; fi; && $(MAKE) all

You have multiple syntax problems with the shell command on
that
makefile line.  Whitespace is important!  Do not compress it
around
the test [ ... ] operator.

Second you cannot simply put in newlines wherever.  Each
newline will
terminate the command.  Where you have echo on a line by
itself this
will simply echo an empty line.  Then you have
"no" and "toto" on
separate lines which is definitely wrong.  Don't do that. 
Put all of
that one one line.

> could someone help me understanding how to execute
multiple commands
> on the same line?

Each logical line of a makefile is executed in its own
shell.  This
means that variables cannot be set across lines and
directory changes
cannot be changed across lines.  This means that everything
must occur
on one logical line.  In order to use multiple commands you
must
separate them on the same line using the shell such as ';'
to separate
commands or '|' to pipe commands or '&&' and '||' to
create
conditional execution of lists of commands.

all :
	echo "in the main directory"
	cd
dir1 ; if [ -s toto ]; then echo "toto existe";
else echo; "no toto"; fi ; $(MAKE) all

The whitespace at the beginning of the line must start with
a TAB
character.  It cannot begin with spaces.

It is possible to break up long lines across multiple
makefile lines.
In order to do this the newline character at the end of the
line must
be escaped with a backslash.  This causes it to
"disappear" from the
input.  This means that the ';' and other shell separators
must still
exist.

all :
	echo "in the main directory"
	cd
dir1 && 
	  if [ -s toto ]; 
	    then echo "toto existe"; 
	    else echo; "no toto"; 
	  fi; $(MAKE) all

Bob