/usr/lib/fortc/linux.m4 is in libxgks-dev 2.6.1+dfsg.2-5.
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 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | divert(-1)
# Name of system platform (for use in comments)
define(`M4__SYSTEM', Linux)
# transformation from fortran name to name of C module. Append an extra
# underscore if the name contains an underscore.
define(`NAMEF',`ifelse(index($1,_),-1,$1_,$1_)')
define(`REALX',`')
define(`INTEGERX',`')
define(`FUNCTIONX',`')
define(`DOUBLEX',`')
# transformation from string name to corresponding argument name
define(`STRINGF',`$1')
# extra arguments, if any, for string length
define(`STRINGX',`, $1_len') # one extra stringlen parameter
# declaration to be used for argument name descriptor
define(`STRINGD',`
char *$1; `$2'
int $1`'`_len';') # declare argument string with extra stringlen parameter
define(`STRINGP',`
char *$1')
define(`STRINGPX',`,
int $1_len')
# declarations and initializations of canonical local variables
define(`STRINGL',`')
# FORTRAN declaration for a long integer (e.g. integer*4 for Microsoft)
define(`LONG_INT',`integer')
# FORTRAN declaration for a short integer (e.g. integer*2)
define(`SHORT_INT',`integer*2')
# FORTRAN declaration for an integer byte (e.g. integer*1 or byte)
define(`BYTE_INT',`byte')
# FORTRAN declaration for single precision
define(`SINGLE_PRECISION',`real')
# FORTRAN declaration for double precision (e.g. real for a Cray)
define(`DOUBLE_PRECISION',`double precision')
divert(0)dnl
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