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Full Discussion: Help understanding a line in makefile
Top Forums UNIX for Beginners Questions & Answers Help understanding a line in makefile Post 303041904 by sesefsefs on Friday 6th of December 2019 04:46:41 PM
Old 12-06-2019
Help understanding a line in makefile
I have a big makefile that I am trying to get my head around, this line is what is confusing me.

Code:
LDFLAGS = -Wl,-rpath-link,$(SYSROOT)/lib/arm-linux-gnueabihf,-rpath-link,$(SYSROOT)/usr/lib/arm-linux-gnueabihf --sysroot=$(SYSROOT) -L$(SYSROOT)/lib -L$(SYSROOT)/usr/lib -L$(SYSROOT)/usr/lib/arm-linux-gnueabihf -B$(SYSROOT)/usr/lib/arm-linux-gnueabihf -dynamic -lpthread

I know roughly the purpose of LDFLAGS, but I struggle following the chain of variables in this linker flag expression. It seems like there is unnecessary repetition and that confuses me slightly. I need to modify that makefile to include shared library that the manufacturer of the embedded system has made. The line below is what is only provided in the software manual for that system,

Code:
PC$ arm-linux-gnueabihf-gcc -Wall -mthumb -mthumb-interwork -D_REENTRANT -oowa4x_AN3 ./*.cpp -ldl -lpthread -lGSM_Module


I'd like to include lGSM_Module in the above LDFLAGS variable. I have tried this, but successfully.

Code:
LDFLAGS = -Wl,-rpath-link,$(SYSROOT)/lib/arm-linux-gnueabihf-gcc,-rpath-link,$(SYSROOT)/usr/lib/arm-linux-gnueabihf --sysroot=$(SYSROOT) -L$(SYSROOT)/lib -L$(SYSROOT)/usr/lib -L$(SYSROOT)/usr/lib/arm-linux-gnueabihf -B$(SYSROOT)/usr/lib/arm-linux-gnueabihf -dynamic -lpthread -shared -oowa4x_AN3 -ldl -lpthread -L/lib -lGPS2_Module

 

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LEARN ABOUT DEBIAN

plxload

PLXLOAD(1p)						User Contributed Perl Documentation					       PLXLOAD(1p)

NAME

       plxload - show what files a perl program loads at compile time

SYNOPSYS

	   $ plxload

DESCRIPTION

       This program is used to show what modules a program would load at compile time via "use".  Because this installs an at-exit handler and
       then uses Perl's -c flag for compile only, it will not find modules loaded at run-time.	Use the Devel::Loaded module for that.

EXAMPLES

	   $ plxload perldoc
	   /usr/local/devperl/lib/5.00554/Exporter.pm
	   /usr/local/devperl/lib/5.00554/strict.pm
	   /usr/local/devperl/lib/5.00554/vars.pm
	   /usr/local/devperl/lib/5.00554/i686-linux/Config.pm
	   /usr/local/devperl/lib/5.00554/Getopt/Std.pm

	   $ plxload /usr/src/perl5.005_54/installhtml
	   /usr/local/devperl/lib/5.00554/Carp.pm
	   /usr/local/devperl/lib/5.00554/Exporter.pm
	   /usr/local/devperl/lib/5.00554/auto/Getopt/Long/autosplit.ix
	   /usr/local/devperl/lib/5.00554/strict.pm
	   /usr/local/devperl/lib/5.00554/vars.pm
	   /usr/local/devperl/lib/5.00554/Pod/Functions.pm
	   /usr/local/devperl/lib/5.00554/Getopt/Long.pm
	   /usr/local/devperl/lib/5.00554/i686-linux/Config.pm
	   /usr/local/devperl/lib/5.00554/lib.pm
	   /home/tchrist/perllib/Pod/Html.pm
	   /usr/local/devperl/lib/5.00554/Cwd.pm
	   /usr/local/devperl/lib/5.00554/AutoLoader.pm

SEE ALSO

       Devel::Loaded and pmload(1).

AUTHORS and COPYRIGHTS
       Copyright (C) 1999 Tom Christiansen.

       Copyright (C) 2006-2008 Mark Leighton Fisher.

       This is free software; you can redistribute it and/or modify it under the terms of either: (a) the GNU General Public License as published
       by the Free Software Foundation; either version 1, or (at your option) any later version, or (b) the Perl "Artistic License".  (This is the
       Perl 5 licensing scheme.)

       Please note this is a change from the original pmtools-1.00 (still available on CPAN), as pmtools-1.00 were licensed only under the Perl
       "Artistic License".

perl v5.10.1							    2010-02-22							       PLXLOAD(1p)
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