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Cray Standard C/C++ Reference Manual
9.3 Calling Fortran Functions and Subroutines from a C or C++ Function
This subsection describes the following aspects of calling Fortran from C or
C++. Topics include requirements and guidelines, argument passing, array
storage, logical and character data, accessing named common, and accessing
blank common.
9.3.1 Requirements
Keep the following points in mind when calling Fortran functions from C or C++:
• Fortran uses the call-by-address convention. C and C++ use the call-by-value
convention, which means that only pointers should be passed to Fortran
subprograms. See Section 9.3.2, page 127.
• Fortran arrays are in column-major order. C and C++ arrays are in row-major
order. This indicates which dimension is indicated by the first value in an
array element subscript. See Section 9.3.3, page 127.
• Single-dimension arrays of signed 64-bit integers and single dimension arrays
of 64-bit floating-point numbers are the only aggregates that can be passed as
parameters without changing the arrays.
• Fortran character pointers and character pointers from Cray Standard C/C++
are incompatible. See Section 9.3.4, page 128.
• Fortran logical values and the Boolean values from C and C++ are not fully
compatible. See Section 9.3.4, page 128.
• External C and C++ variables are stored in common blocks of the same
name, making them readily accessible from Fortran programs if the C or
C++ variable is in uppercase.
• When declaring Fortran functions or objects in C or C++, the name must be
specified in all uppercase letters, digits, or underscore characters and consist
of 31 or fewer characters.
• In Cray Standard C, Fortran functions can be declared using the fortran
keyword (see Section 5.2, page 106). The fortran keyword is not available
in Cray Standard C++. Instead, Fortran functions must be declared by
specifying extern "C".
126 S–2179–36
- Cray Standard C/C++ Reference 1
- New Features 3
- Record of Revision 5
- S–2179–36 v 9
- Directives [3] 45 11
- Cray Standard C++ [4] 103 13
- Predefined Macros [7] 117 14
- Contents 15
- S–2179–36 xi 15
- S–2179–36 xiii 17
- Related Publications 18
- Ordering Documentation 19
- Conventions 19
- Reader Comments 20
- Introduction [1] 21
- 2 S–2179–36 22
- Compiler Commands [2] 23
- 2.1 CC Command 24
- 2.2 cc Command 24
- S–2179–36 5 25
- 2.3 Command Line Options 26
- S–2179–36 7 27
- CC -O3 -h vector2 myfile.c 28
- 8 S–2179–36 28
- S–2179–36 9 29
- 10 S–2179–36 30
- 2.5 Template Language Options 32
- 2.6 Virtual Functions Options 33
- 2.7 General Language Options 34
- S–2179–36 15 35
- 16 S–2179–36 36
- S–2179–36 17 37
- 18 S–2179–36 38
- S–2179–36 19 39
- 20 S–2179–36 40
- S–2179–36 21 41
- 22 S–2179–36 42
- S–2179–36 23 43
- 24 S–2179–36 44
- S–2179–36 25 45
- 2.15 Math Options 46
- S–2179–36 27 47
- 2.16 Analysis Tool Options 48
- 2.17 Debugging Options 49
- 2.18 Compiler Message Options 50
- -h nomessage=174:9 51
- S–2179–36 31 51
- 32 S–2179–36 52
- S–2179–36 33 53
- 34 S–2179–36 54
- 2.20 Preprocessing Options 55
- 36 S–2179–36 56
- S–2179–36 37 57
- 2.21 Loader Options 58
- S–2179–36 39 59
- 2.22 Miscellaneous Options 60
- 2.23 Command Line Examples 62
- 2.24 Environment Variables 63
- 44 S–2179–36 64
- #pragma Directives [3] 65
- 3.1 Protecting Directives 66
- 3.3 Loop Directives 66
- 3.5 General Directives 68
- S–2179–36 55 75
- 3.6 Instantiation Directives 77
- 3.7 Vectorization Directives 77
- 3.8 Tasking Directives 82
- S–2179–36 63 83
- 64 S–2179–36 84
- __tsk_name_nnn 85
- S–2179–36 65 85
- 66 S–2179–36 86
- S–2179–36 67 87
- 70 S–2179–36 90
- 80 S–2179–36 100
- Directives [3] 101
- S–2179–36 81 101
- 82 S–2179–36 102
- S–2179–36 83 103
- S–2179–36 85 105
- 3.10 Scalar Directives 106
- S–2179–36 87 107
- 88 S–2179–36 108
- S–2179–36 89 109
- S–2179–36 91 111
- 92 S–2179–36 112
- S–2179–36 97 117
- 98 S–2179–36 118
- 3.11 Inlining Directives 120
- Cray Standard C++ [4] 123
- 104 S–2179–36 124
- 5.1 Complex Data Extensions 125
- 5.2 fortran Keyword 126
- S–2179–36 109 129
- 6.1 Automatic Instantiation 130
- S–2179–36 111 131
- 6.2 Instantiation Modes 133
- 114 S–2179–36 134
- 6.5 Implicit Inclusion 136
- Predefined Macros [7] 137
- 118 S–2179–36 138
- S–2179–36 119 139
- 8.1 Cray TotalView Debugger 141
- 122 S–2179–36 142
- S–2179–36 123 143
- 126 S–2179–36 146
- S–2179–36 127 147
- 128 S–2179–36 148
- S–2179–36 129 149
- Cray Standard C main program: 150
- 134 S–2179–36 154
- S–2179–36 135 155
- Cray Standard C++ program: 156
- S–2179–36 139 159
- S–2179–36 141 161
- 144 S–2179–36 164
- S–2179–36 145 165
- 146 S–2179–36 166
- S–2179–36 147 167
- 148 S–2179–36 168
- S–2179–36 149 169
- 150 S–2179–36 170
- 152 S–2179–36 172
- Libraries and Loaders [A] 173
- 154 S–2179–36 174
- S–2179–36 155 175
- B.1 C++ Conformance 177
- 158 S–2179–36 178
- S–2179–36 159 179
- 160 S–2179–36 180
- B.2 C++ Anachronisms Accepted 181
- 164 S–2179–36 184
- S–2179–36 171 191
- Compiler Messages [C] 193
- 174 S–2179–36 194
- C.3 Message Severity 195
- C.4 Common System Messages 196
- S–2179–36 177 197
- Intrinsic Functions [D] 199
- Cray SV1 series only 201
- S–2179–36 181 201
- S–2179–36 183 203
- 184 S–2179–36 204
- S–2179–36 185 205
- 186 S–2179–36 206
- S–2179–36 187 207
- 188 S–2179–36 208
- S–2179–36 189 209
- 190 S–2179–36 210
- S–2179–36 191 211
- 192 S–2179–36 212
- S–2179–36 193 213
- 194 S–2179–36 214
- S–2179–36 195 215
- 196 S–2179–36 216
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