In upgrading to PETSc v3.8.x, we are seeing a compilation error with
gfortran (version 6.2.0, users report the same problem with version
7.x). The compile error is thrown when, say, type KSP variables are
put in common blocks; we do not see any errors with this construct
when using ifort (Intel compiler version 14.0.3).
The compile error is easily reproduced. For example in
src/ksp/ksp/examples/tutorials, below the line
KSP ksp
just add the line
common /mycom/ ksp
gfortran then complains with:
KSP ksp
1
Error: Derived type variable ‘ksp’ in COMMON at (1) has neither the
SEQUENCE nor the BIND(C) attribute
ifort is perfectly happy and produces executable code. Any ideas on how
to fix this problem?
-sanjay
