using variables in makefile

using variables in makefile

[mahmoodn]

In my makefile I have these lines:
GPGPUSIM_ROOT := $(GPGPUSIM_ROOT)
include $(NVIDIA_CUDA_SDK_LOCATION)/C/common/common.mk

I have set two variables in bash.rc file. The results for echo are:
mahmood@magma:~$ echo $GPGPUSIM_ROOT
/home/mahmood/gpgpusim/gpgpu-sim_v2.1.1b

mahmood@magma:~$ echo $NVIDIA_CUDA_SDK_LOCATION
/home/mahmood/NVIDIA_GPU_Computing_SDK

Now when I run the makefile I get this error:
Makefile:<line number>: /C/common/common.mk: No such file or directory
make: *** No rule to make target `/C/common/common.mk'.  Stop.

I have searched to find why environment variables don't work in makefile,
but didn't find anything useful. I am not expert in makefile structures but
I have compiled makefiles that contain 
-I$(VARIABLE)/include and they are successfull. So what is the difference
here?

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RE: using variables in makefile

[John (Eljay) Love-Jensen]

Hi mahmoodn,

You question is off topic for this forum.

This is a GCC forum.

Your question is a Make question.

I do not say this to chastise.  I mention it so that you may ask your question on the appropriate forum, so as to get answers from people who are more familiar with that domain -- and as such the answers will probably be more quickly answered and more accurately answered.

That being said...

You should read the documentation on Make on how it uses environment variables.

6.9 Variables from the Environment
http://www.gnu.org/software/make/manual/html_node/Environment.html

You should also verify that your environment variables are exported.  If they are not exported, then they are not visible to child processes.

HTH,
--Eljay

RE: using variables in makefile

[mahmoodn]

Thanks, I wasn't aware of gnu-make forum. I will post it there. Please delete
this thread from this forum.


John (Eljay) Love-Jensen wrote:
> 
> Hi mahmoodn,
> 
> You question is off topic for this forum.
> 
> This is a GCC forum.
> 
> Your question is a Make question.
> 
> I do not say this to chastise.  I mention it so that you may ask your
> question on the appropriate forum, so as to get answers from people who
> are more familiar with that domain -- and as such the answers will
> probably be more quickly answered and more accurately answered.
> 
> That being said...
> 
> You should read the documentation on Make on how it uses environment
> variables.
> 
> 6.9 Variables from the Environment
> http://www.gnu.org/software/make/manual/html_node/Environment.html
> 
> You should also verify that your environment variables are exported.  If
> they are not exported, then they are not visible to child processes.
> 
> HTH,
> --Eljay
> 
> 

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