Error in "make yambo"

[jmmorbec]

Hello.

I am trying to install yambo-3.4.1 in a Cray XE6 machine, and I got the following error

>>>[Making bse]<<<
make[1]: Entering directory `/global/u1/j/jnmorbec/yambo-3.4.1/src/bse'
PGF90-S-0038-Symbol, isnan, has not been explicitly declared (K_Haydock.f90)
0 inform, 0 warnings, 1 severes, 0 fatal for k_haydock
make[1]: *** [K_Haydock.o] Error 2
make[1]: Leaving directory `/global/u1/j/jnmorbec/yambo-3.4.1/src/bse'
make: *** [yambo] Error 2

in "make yambo".

Could you help me with this, please? How can I avoid this error?

Thank you!

[Daniele Varsano]

Dear Juliana,
isnan is an intrinsic fortran function, which is supported by the gnu, or intel compiler.
It looks that it is not supported by pgi. You can look here:
http://www.pgroup.com/userforum/viewtop ... 26666dcc16

If you have them available, you can switch to intel or gfortran compiler (suggested).
Otherwise:
try replace the following lines:

Code: Select all

193      if( isnan(Bf(it+1)) ) call error('Bf=NaN likely because some eigenvalue of BSE is negative.')

and

Code: Select all

232      if( isnan(Bf(it+1)) ) call error(' Bf=NaN likely because some eigenvalue of BSE is negative.')

substituting the isnan function with ieee_is_nan, in this case I presume you have to add also:
use ieee_arithmetic

If not working, just comment the two lines above and hope you will not ends up with negative eigenvalues.

Best,
Daniele

[jmmorbec]

Dear Daniele.

Thank you very much for your help.
It seems to replace isnan with ieee_is_nan worked. At least no error in "make yambo interfaces".

Best wishes,

Juliana