Help understanding a line in makefile


 
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# 1  
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

# 2  
Old 12-06-2019
Quote:
Originally Posted by sesefsefs
I'd like to include lGSM_Module in the above LDFLAGS variable. I have tried this, but successfully.
Is this a typo?
# 3  
Old 12-07-2019
Yes, it was meant to be unsuccessfully.
# 4  
Old 12-07-2019
Quote:
Originally Posted by sesefsefs
I'd like to include lGSM_Module in the above LDFLAGS variable. I have tried this, but successfully.
The first thing I would do, if it was me, is to locate where the IGM_Module is located (exactly) in your filesystem.

Did you do that?
# 5  
Old 12-09-2019
I did, but I found two instances for each applicable library.

1) libGSM_Module.so in the /lib/

2) libGSM_Module.so.0.0.0 in the /lib/owasys

owasys is the name of the system manufacturer.
# 6  
Old 12-09-2019
Is the file without the 0.0.0 a symbolic link to the one with the 0.0.0 in the filename?
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