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?

William
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Mojolicious::Command::generate::makefile(3pm)		User Contributed Perl Documentation	     Mojolicious::Command::generate::makefile(3pm)

NAME
Mojolicious::Command::generate::makefile - Makefile generator command SYNOPSIS
use Mojolicious::Command::generate::makefile; my $makefile = Mojolicious::Command::generate::makefile->new; $makefile->run(@ARGV); DESCRIPTION
Mojolicious::Command::generate::makefile generates "Makefile.PL" files for applications. ATTRIBUTES
Mojolicious::Command::generate::makefile inherits all attributes from Mojo::Command and implements the following new ones. "description" my $description = $makefile->description; $makefile = $makefile->description('Foo!'); Short description of this command, used for the command list. "usage" my $usage = $makefile->usage; $makefile = $makefile->usage('Foo!'); Usage information for this command, used for the help screen. METHODS
Mojolicious::Command::generate::makefile inherits all methods from Mojo::Command and implements the following new ones. "run" $makefile->run(@ARGV); Run this command. SEE ALSO
Mojolicious, Mojolicious::Guides, <http://mojolicio.us>. perl v5.14.2 2012-09-05 Mojolicious::Command::generate::makefile(3pm)