08-10-2001
Regarding Make Scripts
Hi
I'm well worsed in Shell Scripting on UNIX OS. But I found the script used in Make file for compiling the unix sources is quite criptic. Even though it looks some what like any other Shell Script, but I noticed lots of difference & I'm always facing difficult in understanding the code flow...
I mean, I'm not finding a definite logical/control flow that I found in any other language (viz., C/C++/java) or scripting (bsh/ksh/C shell scripts).
So, when ever I face any of the Make scripts in the work, I spend lots of time scratching my head in understanding the way/logic flows.
Hence, I need to master my self in the art of writing the Make scripts. So please help my out to how to Master my self in the writing Make scripts....
Even I searched lots of Book stores, but failed to find on such book that discuss how to write & Maintain Make Scripts...
Please do the need full..
with Advance Thanks...
Vishwa.
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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)