/usr/share/dune/aclocal/dune_fortran.m4 is in libdune-common-dev 2.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | # a trick to make life for the user easier.
#
# some libs need the fortran test, while other use the f77 test. This
# requires the user to provide two variables, usually with the same
# parameter. In most cases the F77 compiler will be the same as teh FC
# compiler.
#
# We test for FC and F77. If the user has specified both, we do
# nothing, if the user has specified only one of them, we assume that
# the compiler supports both and copy the value. Usually this should
# be the sane default.
#
AC_DEFUN([DUNE_SYNC_FC_F77],[
# variant 1
# FC is set, while F77 is not set
AS_IF([test -n "$FC" && test -z "$F77"], [
AC_MSG_NOTICE([Fortran compiler FC (fortran 90) specified,
while F77 (fortran 77) wasn't set.
Trying to use FC as F77.])
F77="$FC"
])
# variant 2
# F77 is set, while FC is not set
AS_IF([test -z "$FC" && test -n "$F77"], [
AC_MSG_NOTICE([Fortran compiler F77 (fortran 77) specified,
while FC (fortran 90) wasn't set.
Trying to use F77 as FC.])
FC="$F77"
])
])
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