summaryrefslogtreecommitdiffstats
path: root/Modules/FortranCInterface/Detect.cmake
blob: 798c44caa04d7b986eb8c0bab0b6d2b6fe601204 (plain)
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
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
#=============================================================================
# Copyright 2009 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================

configure_file(${FortranCInterface_SOURCE_DIR}/Input.cmake.in
               ${FortranCInterface_BINARY_DIR}/Input.cmake @ONLY)

# Detect the Fortran/C interface on the first run or when the
# configuration changes.
if(${FortranCInterface_BINARY_DIR}/Input.cmake
    IS_NEWER_THAN ${FortranCInterface_BINARY_DIR}/Output.cmake
    OR ${FortranCInterface_SOURCE_DIR}/Output.cmake.in
    IS_NEWER_THAN ${FortranCInterface_BINARY_DIR}/Output.cmake
    OR ${FortranCInterface_SOURCE_DIR}/CMakeLists.txt
    IS_NEWER_THAN ${FortranCInterface_BINARY_DIR}/Output.cmake
    OR ${CMAKE_CURRENT_LIST_FILE}
    IS_NEWER_THAN ${FortranCInterface_BINARY_DIR}/Output.cmake
    )
  message(STATUS "Detecting Fortran/C Interface")
else()
  return()
endif()

# Invalidate verification results.
unset(FortranCInterface_VERIFIED_C CACHE)
unset(FortranCInterface_VERIFIED_CXX CACHE)

set(_result)

# Build a sample project which reports symbols.
try_compile(FortranCInterface_COMPILED
  ${FortranCInterface_BINARY_DIR}
  ${FortranCInterface_SOURCE_DIR}
  FortranCInterface
  CMAKE_FLAGS
    "-DCMAKE_C_FLAGS:STRING=${CMAKE_C_FLAGS}"
    "-DCMAKE_Fortran_FLAGS:STRING=${CMAKE_Fortran_FLAGS}"
  OUTPUT_VARIABLE FortranCInterface_OUTPUT)
set(FortranCInterface_COMPILED ${FortranCInterface_COMPILED})
unset(FortranCInterface_COMPILED CACHE)

# Locate the sample project executable.
if(FortranCInterface_COMPILED)
  find_program(FortranCInterface_EXE
    NAMES FortranCInterface
    PATHS ${FortranCInterface_BINARY_DIR} ${FortranCInterface_BINARY_DIR}/Debug
    NO_DEFAULT_PATH
    )
  set(FortranCInterface_EXE ${FortranCInterface_EXE})
  unset(FortranCInterface_EXE CACHE)
else()
  set(_result "Failed to compile")
  set(FortranCInterface_EXE)
  file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
    "Fortran/C interface test project failed with the following output:\n"
    "${FortranCInterface_OUTPUT}\n")
endif()

# Load symbols from INFO:symbol[] strings in the executable.
set(FortranCInterface_SYMBOLS)
if(FortranCInterface_EXE)
  file(STRINGS "${FortranCInterface_EXE}" _info_strings
    LIMIT_COUNT 8 REGEX "INFO:[^[]*\\[")
  foreach(info ${_info_strings})
    if("${info}" MATCHES ".*INFO:symbol\\[([^]]*)\\].*")
      string(REGEX REPLACE ".*INFO:symbol\\[([^]]*)\\].*" "\\1" symbol "${info}")
      list(APPEND FortranCInterface_SYMBOLS ${symbol})
    endif()
  endforeach()
elseif(NOT _result)
  set(_result "Failed to load sample executable")
endif()

set(_case_mysub "LOWER")
set(_case_my_sub "LOWER")
set(_case_MYSUB "UPPER")
set(_case_MY_SUB "UPPER")
set(_global_regex  "^(_*)(mysub|MYSUB)([_$]*)$")
set(_global__regex "^(_*)(my_sub|MY_SUB)([_$]*)$")
set(_module_regex  "^(_*)(mymodule|MYMODULE)([A-Za-z_$]*)(mysub|MYSUB)([_$]*)$")
set(_module__regex "^(_*)(my_module|MY_MODULE)([A-Za-z_$]*)(my_sub|MY_SUB)([_$]*)$")

# Parse the symbol names.
foreach(symbol ${FortranCInterface_SYMBOLS})
  foreach(form "" "_")
    # Look for global symbols.
    string(REGEX REPLACE "${_global_${form}regex}"
                         "\\1;\\2;\\3" pieces "${symbol}")
    list(LENGTH pieces len)
    if(len EQUAL 3)
      set(FortranCInterface_GLOBAL_${form}SYMBOL "${symbol}")
      list(GET pieces 0 FortranCInterface_GLOBAL_${form}PREFIX)
      list(GET pieces 1 name)
      list(GET pieces 2 FortranCInterface_GLOBAL_${form}SUFFIX)
      set(FortranCInterface_GLOBAL_${form}CASE "${_case_${name}}")
    endif()

    # Look for module symbols.
    string(REGEX REPLACE "${_module_${form}regex}"
                         "\\1;\\2;\\3;\\4;\\5" pieces "${symbol}")
    list(LENGTH pieces len)
    if(len EQUAL 5)
      set(FortranCInterface_MODULE_${form}SYMBOL "${symbol}")
      list(GET pieces 0 FortranCInterface_MODULE_${form}PREFIX)
      list(GET pieces 1 module)
      list(GET pieces 2 FortranCInterface_MODULE_${form}MIDDLE)
      list(GET pieces 3 name)
      list(GET pieces 4 FortranCInterface_MODULE_${form}SUFFIX)
      set(FortranCInterface_MODULE_${form}CASE "${_case_${name}}")
    endif()
  endforeach()
endforeach()

# Construct mangling macro definitions.
set(_name_LOWER "name")
set(_name_UPPER "NAME")
foreach(form "" "_")
  if(FortranCInterface_GLOBAL_${form}SYMBOL)
    if(FortranCInterface_GLOBAL_${form}PREFIX)
      set(_prefix "${FortranCInterface_GLOBAL_${form}PREFIX}##")
    else()
      set(_prefix "")
    endif()
    if(FortranCInterface_GLOBAL_${form}SUFFIX)
      set(_suffix "##${FortranCInterface_GLOBAL_${form}SUFFIX}")
    else()
      set(_suffix "")
    endif()
    set(_name "${_name_${FortranCInterface_GLOBAL_${form}CASE}}")
    set(FortranCInterface_GLOBAL${form}_MACRO
      "(name,NAME) ${_prefix}${_name}${_suffix}")
  endif()
  if(FortranCInterface_MODULE_${form}SYMBOL)
    if(FortranCInterface_MODULE_${form}PREFIX)
      set(_prefix "${FortranCInterface_MODULE_${form}PREFIX}##")
    else()
      set(_prefix "")
    endif()
    if(FortranCInterface_MODULE_${form}SUFFIX)
      set(_suffix "##${FortranCInterface_MODULE_${form}SUFFIX}")
    else()
      set(_suffix "")
    endif()
    set(_name "${_name_${FortranCInterface_MODULE_${form}CASE}}")
    set(_middle "##${FortranCInterface_MODULE_${form}MIDDLE}##")
    set(FortranCInterface_MODULE${form}_MACRO
      "(mod_name,name, mod_NAME,NAME) ${_prefix}mod_${_name}${_middle}${_name}${_suffix}")
  endif()
endforeach()

# Summarize what is available.
foreach(scope GLOBAL MODULE)
  if(FortranCInterface_${scope}_SYMBOL AND
      FortranCInterface_${scope}__SYMBOL)
    set(FortranCInterface_${scope}_FOUND 1)
  else()
    set(FortranCInterface_${scope}_FOUND 0)
  endif()
endforeach()

# Record the detection results.
configure_file(${FortranCInterface_SOURCE_DIR}/Output.cmake.in
               ${FortranCInterface_BINARY_DIR}/Output.cmake @ONLY)
file(APPEND ${FortranCInterface_BINARY_DIR}/Output.cmake "\n")

# Report the results.
if(FortranCInterface_GLOBAL_FOUND)
  if(FortranCInterface_MODULE_FOUND)
    set(_result "Found GLOBAL and MODULE mangling")
  else()
    set(_result "Found GLOBAL but not MODULE mangling")
  endif()
elseif(NOT _result)
  set(_result "Failed to recognize symbols")
endif()
message(STATUS "Detecting Fortran/C Interface - ${_result}")