compiler flags

[sachinP]

I have added one fortran routine to cesm which need to be compiled with special flag `python3-config --ldflags --embed`. I am using this routine to call some python function using c interface.
Where I can modify the compilation option in cesm?
Can I compile this FORTRAN module with mentioned python flags with rest of model code?

 

[jedwards]

Yes you can. Create a new dependency file or add to an existing one. The following Dependency file names are supported:
$(CASEROOT)/Depends.$(COMPILER) $(CASEROOT)/Depends.$(MACH) $(CASEROOT)/Depends.$(MACH).$(COMPILER)

The location of this file depends on the cesm version you have - in cesm 2.1 its in cime/config/cesm/machines, in cesm23 it's in
ccs_config/machines. You should be able to determine the format by examining one of the existing files.

 

[sachinP]

I will try it. Thank you very much.

 

[sachinP]

Hi,

I need to compile one of the module in cesm 'crm_physics.F90' by linking it with object file of another module forpy_mod.F90
In short I need to execute following command to compile crm_physics.F90

ifort -c crm_physics.F90 forpy_mod.o `python3-config --ldflags --embed`

I have created my own Depend file that I have attached here where I have added extra compilation flags.

However model is not able to compile. I have attached the compilation log file here.
It looks like I am not able to link crm_physics.F90 with forpy_mod. I will appreciate your help in this regards.


Thanks in advance,
Sachin

 

[jedwards]

No attachment found.

 

[sachinP]

I apologize. Here are the attachments.

 

[sachinP]

I apologize. Here are the attachments.

 

[sachinP]

Hi,
I am not able to attache the files. After attache files when I try to post rthe eply I could not see the attachment.

 

[jedwards]

The error message should be clear - typically you need to add a .txt to the end of the file name.

 

[sachinP]

Please see attached built log file and other files that I mentioned earlier.

 

[jedwards]

So it looks like the compile of the forpy_mod is fine but you aren't linking the python routines you need at the end.
I think that the `python3-config --ldflags --embed` needs to be added to the LDFLAGS and doesn't need to be in
Depends where you have it.

 

[sachinP]

Yes. I agree.
Can you please tell me in which file LDFLAG is set in general?
Do I need to set it for specific file crm_physcs.F90?

Thanks

 

[jedwards]

LDFLAGS is set for the link step (the final step of building the model) You didn't mention which model version you are using,
for cesm2.1 you would set it in config_compilers.xml, for cesm2.3 you set it in ccs_config/machines/cmake_macros

 

[sachinP]

Hi,
I am using cesm 2.2.

 

[jedwards]

cime/config/cesm/machines/config_compilers.xml

 

[sachinP]

Thank you for suggestion.
I tried to change the ldflag in config_compilers.xml file. I made changes in the following part of the file

<compiler COMPILER="intel">
<CFLAGS>
<base> -qno-opt-dynamic-align -fp-model precise -std=gnu99 </base>
<append compile_threaded="TRUE"> -qopenmp </append>
<append DEBUG="FALSE"> -O2 -debug minimal </append>
<append DEBUG="TRUE"> -O0 -g </append>
</CFLAGS>
<CPPDEFS>
<!-- Intel Developer Zone -->
<append> -DFORTRANUNDERSCORE -DCPRINTEL</append>
</CPPDEFS>
<CXX_LDFLAGS>
<base> -cxxlib </base>
</CXX_LDFLAGS>
<base> -lpython3.8 </base> ###(I changed the flag here)


I am using -lpython3.8 for linking with python. However, with this change I am still getting similar error in built.

Is there anything wrong with my changes with ldflag. I have also tried the flag `python3-config --ldflags --embed`

Thank you.

 

[sachinP]

In addition, I have tried this also
<base> -cxxlib -lpython3.8 </base>

 

[jedwards]

When I run `python3-config --ldflags --embed` on my system I get:
-L/glade/work/jedwards/conda/cheyenne/lib/python3.9/config-3.9-x86_64-linux-gnu -L/glade/work/jedwards/conda/cheyenne/lib -lpython3.9 -lcrypt -lpthread -ldl -lutil -lrt -lm

Do you get something similar? Your config_compilers.xml should look something like:
<LDFLAGS>
<append>-L/glade/work/jedwards/conda/cheyenne/lib/python3.9/config-3.9-x86_64-linux-gnu -L/glade/work/jedwards/conda/cheyenne/lib -lpython3.9 -lcrypt -lpthread -ldl -lutil -lrt -lm </append>
</LDFLAGS>

 

[sachinP]

when I run `python3-config --ldflags --embed` on my machine I get
-L/usr/lib/python3.8/config-3.8-x86_64-linux-gnu -L/usr/lib -lpython3.8 -lcrypt -lpthread -ldl -lutil -lm -lm
which looks similar to what you have on your system.
I added LDFLAG as
<LDFLAGS>
<append> -L/usr/lib/python3.8/config-3.8-x86_64-linux-gnu -L/usr/lib -lpython3.8 -lcrypt -lpthread -ldl -lutil -lm -lm </append>
</LDFLAGS>
in config_compiles.xml file but problem persists with same error.

 

[jedwards]

You need to share the error log.