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Makefile executing another Makefile first?

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Old 07-20-2010
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?


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ml-makedepend(1)					      General Commands Manual						  ml-makedepend(1)

ml-makedepend - list files a ML program depends upon SYNOPSIS
ml-makedepend [ DU-options ] [ -n ] [ -f makefile ] target ml-makedepend [ DU-options ] [ -a arch ] [ -o os ] [ -f makefile ] target DESCRIPTION
This manual page documents briefly the ml-makedepend command. This manual page was written for the Debian distribution because the origi- nal program does not have a manual page. The ml-makedepend script is part of the SML/NJ CM (Compilation and Library Manager) that is used to generate a list of files that a ML program depends on for use by make. OPTIONS
A summary of options is included below. -n ml-makedepend usually uses the make variables $(ARCH) and $(OPSYS) in the filenames for the Makefile. This option disables this feature. -a arch Use arch in place of $(ARCH). -o os Use os in place of $(OPSYS). -f makefile Name of the makefile to be used rather than the default Makefile. -Dname=value Set CM variable to given value. -Dname Set CM variable to 1. -Uname Unset CM variable. SEE ALSO
sml(1), ml-lex(1), ml-build(1), ml-yacc(1). The programs are documented fully by CM: The SML/NJ Compilation and Library Manager, User Manual, Matthias Blume, which is available via <>. AUTHOR
This manual page was written by Aaron Matthew Read <>, for the Debian GNU/Linux system (but may be used by others). October 25, 2002 ml-makedepend(1)

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