Makefile executing another Makefile first?

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07-20-2010

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Makefile executing another Makefile first?

I have 2 libraries in 2 different directories that I build with Makefiles.

library B depends on library A. If I modify a .cpp file in library A and run lib B's Makefile can I have B's makefile to automatically rebuild library A?

I am now rebuilding A, followed by B... but I'd like B to rebuild A automatically if it needs rebuilding. This is a streamlined example, but my real situation is
more complicated. I'd like the makefile for the final application to cause all
dependent libraries to build, if necessary so that I don't have to manually build them in the correct order.

I've tried "include ../A/Makefile" in B's Makefile, but I get errors. I think its because the directory doesn't change to ../A

Makefile:81: warning: overriding commands for target `all'
../A/Makefile:78: warning: ignoring old commands for target `all'
Makefile:98: warning: overriding commands for target `clean'
../A/Makefile:99: warning: ignoring old commands for target `clean'
make: *** No rule to make target `tinystr.o', needed by `A.a'. Stop.

Does anyone know how to make this work?

William

wwuster

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LEARN ABOUT CENTOS

create_makefiles

CREATE_MAKEFILES()														CREATE_MAKEFILES()

NAME

       create_makefiles - Recreates all Makefiles beneath a directory

SYNOPSIS

       create_makefiles [dir]

DESCRIPTION

       create_makefiles recreates all Makefiles in dir and its (recursed) subdirectories from the corresponding Makefile.am templates.

       This script must be run from the toplevel directory (the one containing configure). This script saves time compared to re-running configure
       completely.

       If the source directory is different from the build directory (see the environment variables below), it will be assumed that each
       Makefile.am and Makefile.in belongs beneath the source directory and that each Makefile belongs beneath the build directory.

       This utility is part of the KDE Software Development Kit.

ENVIRONMENT

       One of the following variables (but not both) should be set if the source directory is different from the build directory. If the build
       directory is simply a subdirectory of the source directory, the simpler variable OBJ_SUBDIR should be used.

       OBJ_SUBJDIR
	   Indicates that the build directory is in the given subdirectory of the source directory. For instance, if the source directory is
	   kdesdk and the build directory is kdesdk/obj-i386-linux, then OBJ_SUBDIR should be set to obj-i386-linux.

       OBJ_REPLACEMENT
	   A sed expression that is used to transform the source directory into the build directory. For instance, if the source directory is
	   kdesdk/obj-i386-linux, then OBJ_REPLACEMENT should be set to s#kdesdk#kdesdk-obj#.

SEE ALSO

       create_makefile(1) make(2)

AUTHORS

       create_makefiles was written by David Faure<faure@kde.org>.

       This manual page was prepared by Ben Burton<bab@debian.org> for the Debian GNU/Linux system (but may be used by others).

																CREATE_MAKEFILES()