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Home/ Questions/Q 8526491
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Editorial Team
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Editorial Team
Asked: June 11, 20262026-06-11T08:17:14+00:00 2026-06-11T08:17:14+00:00

i am trying to compile a fortran 90 program which has a call to

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i am trying to compile a fortran 90 program which has a call to POPCNT as follows:

 ...
 print *, popcnt(127)
 ...

by compiling it as follows:

 gfortran prog.f90 

it gives me the following:

 ...: undefined reference to `popcnt_'

plz can anyone suggest the correct way of compiling? thanks.

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  1. Editorial Team
    Editorial Team
    2026-06-11T08:17:15+00:00Added an answer on June 11, 2026 at 8:17 am

    support for bitcnt is added in version 4.6
    http://gcc.gnu.org/wiki/GFortran#GCC4.6. So you have to find newer executable, or compile your own.

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