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From: "jvdelisle at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/61928] a fortran90 program compiles on hopper at NERSC but not under gfortran 4.9.0
Date: Sun, 27 Jul 2014 21:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61928

Jerry DeLisle <jvdelisle at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jvdelisle at gcc dot gnu.org

--- Comment #3 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
With you attachment, I am getting this:

/tmp/ccBACux5.o: In function `dgefa.2334':
pr61928.f90:(.text+0x1282): undefined reference to `idamax_'
/tmp/ccBACux5.o: In function `dgedi.2345':
pr61928.f90:(.text+0x19fa): undefined reference to `dscal_'
pr61928.f90:(.text+0x1aba): undefined reference to `daxpy_'
pr61928.f90:(.text+0x1c2d): undefined reference to `daxpy_'
pr61928.f90:(.text+0x1cbd): undefined reference to `dswap_'
collect2: error: ld returned 1 exit status

I did not link this with anything. The four last listed procedures listed are
not defined in the attachment, although used.

In subroutine dgefa, idamax is defined as an integer. If I delete that line,
the undefined reference to idamax_ goes away.  The last four references I
suspect are in the BLAS library that I am not linked to at the moment.