topic Indeed! I never knew about in Intel® Fortran Compiler

How to inspect which flags are used

Karl_Yngve_L_ — Tue, 10 Nov 2015 15:41:18 GMT

I am working on a Makefile where I am trying to find which flags to use. The current list of flags is (for some historical reason):

-r8 -fpe0 -g -debug all -traceback -fp-model source -warn all -warn unused -check all,noarg_temp_created

From searching, I believe this may be reduced to

-r8 -fpe0 -g -traceback -fp-model source -warn all -check all,noarg_temp_created

However, I was thinking that there might be an option that would list the options that were passed to `ifort`.

If you generate a listing

Steven_L_Intel1 — Tue, 10 Nov 2015 16:50:50 GMT

If you generate a listing file (-list), all of the flags used will be shown at the end.

Thanks, Steve! That works

Karl_Yngve_L_ — Wed, 11 Nov 2015 10:49:36 GMT

Thanks, Steve! That works perfectly!

Indeed! I never knew about

Matt_Thompson — Thu, 12 Nov 2015 13:26:37 GMT

Indeed! I never knew about this functionality. I think I might try and get a script using this for when I'm debugging a code and trying to clean up the flags.

Steve, is there any place in the Docs or on the Intel site that can help decipher some of the more obscure bits of the listing, e.g.,

-fp_modbits nofp_contract -fp_modbits nono_fp_contract

I figure most are only useful to your engineers, and for my purposes a "no-diff" means I got the same flags, I'm guessing.

OK, this is one of our

Lorri_M_Intel — Mon, 16 Nov 2015 16:45:16 GMT

OK, this is one of our internal secrets, but "fp_modbits" is an extended list of fp-model bits, and yes, you're right, it's only interesting internally.

We'll look at fixing the output so that it says "fp_model" instead of "fp_modbits", to avoid the confusion.

thanks --

--Lorri

Thanks, Steve! That works

Adel_S_ — Sat, 19 Mar 2016 17:59:50 GMT

Thanks, Steve! That works perfectly!