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
