use integer64 flag for Cray Fortran compiler

[ajaypanyala]

Description
use default64 flag for Cray ftn compiler when BUILD_INDEX64 is ON.

Checklist

• [ X] The documentation has been updated.
• [X ] If the PR solves a specific issue, it is set to be closed on merge.

[ajaypanyala]

@langou Could you please review the latest commit again, thanks!

[codecov]

Codecov Report

Merging #617 (9c2380c) into master (1782d90) will not change coverage.
The diff coverage is n/a.

❗ Current head 9c2380c differs from pull request most recent head f3e8010. Consider uploading reports for the commit f3e8010 to get more accurate results

@@           Coverage Diff           @@
##           master     #617   +/-   ##
=======================================
  Coverage    0.00%    0.00%           
=======================================
  Files        1894     1894           
  Lines      184034   184021   -13     
=======================================
+ Misses     184034   184021   -13     

Impacted Files	Coverage Δ
SRC/cgeqrf.f	0.00% <0.00%> (ø)
SRC/cgerqf.f	0.00% <0.00%> (ø)
SRC/dgeqrf.f	0.00% <0.00%> (ø)
SRC/dgerqf.f	0.00% <0.00%> (ø)
SRC/sgeqrf.f	0.00% <0.00%> (ø)
SRC/sgerqf.f	0.00% <0.00%> (ø)
SRC/zgeqrf.f	0.00% <0.00%> (ø)
SRC/zgerqf.f	0.00% <0.00%> (ø)

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[weslleyspereira]

Hi @ajaypanyala. Could you please help resolving this conflict?
We accepted #624 that uses set(FORTRAN_ILP TRUE) instead of set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdefault-integer-8"). I am not sure if #624 is sufficient to enable default64 flag for Cray ftn compiler.

[ajaypanyala]

Hi @weslleyspereira I can update #617 to reflect my comment on #624. Please let me know If you want me to proceed with that.

[weslleyspereira]

Hi @weslleyspereira I can update #617 to reflect my comment on #624. Please let me know If you want me to proceed with that.

Oh, now I see the command set(CMAKE_Fortran_FLAGS ... ) was only moved (and not removed) in #617. I agree with your proposed changes. You can proceed with the modifications. Thanks!