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Full Discussion: Makefile help
Top Forums Shell Programming and Scripting Makefile help Post 302715019 by bakunin on Saturday 13th of October 2012 02:10:06 PM
Old 10-13-2012
Quote:
Originally Posted by football12345
Code:
make foo . make $(EXE)

i get

Code:
EXE: command not found
make: `foo' is up to date.
make: Nothing to be done for `.'.
make: *** No rule to make target `make'.  Stop.

Not sure what the errors mean
The errors are to take quite literally:

You execute "make" with the arguments "foo" "." "make" and "$(EXE)".

The first error is from the shell, because "$(EXE)" means run command "EXE" in a subshell and put its output here. The shell thinks that the rest of the command depends on what EXE might output and therefor execute it first - as there is no "EXE, this fails.

Next, "make" is executed and takes the argument: "foo". For "foo" exists a target to make and "make" does try to make it but notices that it has already done so and in the meantime "foo" hasn't changed - so it tells you that "foo" is already up to date. Next make tries to "make .". As "." is the current directory and there is no rule in your makefile describing how to make "." "make" tells you so. Finally it tries to make "make", which would be (like ".") a perfectly valid target to make - IF it would exist in your makefile. As it doesn't, "make" tells you the same as with ".": it can't make it, because you haven't told it how.

But instead of writing a long-winded make-exegesis, i could probably tell you what you need to know, so: what exactly do you want to achieve? Have you ever used a makefile and know its purposes? Its syntax?

I hope this helps.

bakunin
 

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MAKE(1) 						      General Commands Manual							   MAKE(1)

NAME
make - a program for maintaining large programs SYNOPSIS
make [-f file] [-iknpqrst] [option] ... [target] OPTIONS
-f Use file as the makefile -i Ignore status returned by commands -k On error, skip to next command -n Report, but do not execute -p Print macros and targets -q Question up-to-dateness of target -r Rule inhibit; do not use default rules -s Silent mode -t Touch files instead of making them EXAMPLES
make kernel # Make kernel up to date make -n -f mfile # Tell what needs to be done DESCRIPTION
Make is a program that is normally used for developing large programs consisting of multiple files. It keeps track of which object files depend on which source and header files. When called, it does the minimum amount of recompilation to bring the target file up to date. The file dependencies are expected in makefile or Makefile , unless another file is specified with -f. Make has some default rules built in, for example, it knows how to make .s files from .c files. Here is a sample makefile . d=/user/ast # d is a macro program: head.s tail.s# program depends on these cc -o program head.s tail.s# tells how to make program echo Program done. # announce completion head.s: $d/def.h head.c # head.s depends on these tail.s: $d/var.h tail.c # tail.s depends on these A complete description of make would require too much space here. Many books on UNIX discuss make . Study the numerous Makefiles in the MINIX source tree for examples. SEE ALSO
cc(1). MAKE(1)
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