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71491bbe8f
Teach FortranCInterface_VERIFY to build the test project in a specific configuration and pass all flags for that configuration. This ensures that any modifications made by the user or project to the flag are used in the test project consistently.
298 lines
12 KiB
CMake
298 lines
12 KiB
CMake
# - Fortran/C Interface Detection
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# This module automatically detects the API by which C and Fortran
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# languages interact. Variables indicate if the mangling is found:
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# FortranCInterface_GLOBAL_FOUND = Global subroutines and functions
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# FortranCInterface_MODULE_FOUND = Module subroutines and functions
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# (declared by "MODULE PROCEDURE")
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# A function is provided to generate a C header file containing macros
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# to mangle symbol names:
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# FortranCInterface_HEADER(<file>
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# [MACRO_NAMESPACE <macro-ns>]
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# [SYMBOL_NAMESPACE <ns>]
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# [SYMBOLS [<module>:]<function> ...])
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# It generates in <file> definitions of the following macros:
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# #define FortranCInterface_GLOBAL (name,NAME) ...
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# #define FortranCInterface_GLOBAL_(name,NAME) ...
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# #define FortranCInterface_MODULE (mod,name, MOD,NAME) ...
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# #define FortranCInterface_MODULE_(mod,name, MOD,NAME) ...
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# These macros mangle four categories of Fortran symbols,
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# respectively:
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# - Global symbols without '_': call mysub()
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# - Global symbols with '_' : call my_sub()
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# - Module symbols without '_': use mymod; call mysub()
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# - Module symbols with '_' : use mymod; call my_sub()
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# If mangling for a category is not known, its macro is left undefined.
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# All macros require raw names in both lower case and upper case.
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# The MACRO_NAMESPACE option replaces the default "FortranCInterface_"
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# prefix with a given namespace "<macro-ns>".
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#
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# The SYMBOLS option lists symbols to mangle automatically with C
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# preprocessor definitions:
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# <function> ==> #define <ns><function> ...
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# <module>:<function> ==> #define <ns><module>_<function> ...
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# If the mangling for some symbol is not known then no preprocessor
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# definition is created, and a warning is displayed.
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# The SYMBOL_NAMESPACE option prefixes all preprocessor definitions
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# generated by the SYMBOLS option with a given namespace "<ns>".
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#
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# Example usage:
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# include(FortranCInterface)
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# FortranCInterface_HEADER(FC.h MACRO_NAMESPACE "FC_")
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# This creates a "FC.h" header that defines mangling macros
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# FC_GLOBAL(), FC_GLOBAL_(), FC_MODULE(), and FC_MODULE_().
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#
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# Example usage:
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# include(FortranCInterface)
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# FortranCInterface_HEADER(FCMangle.h
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# MACRO_NAMESPACE "FC_"
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# SYMBOL_NAMESPACE "FC_"
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# SYMBOLS mysub mymod:my_sub)
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# This creates a "FCMangle.h" header that defines the same FC_*()
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# mangling macros as the previous example plus preprocessor symbols
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# FC_mysub and FC_mymod_my_sub.
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#
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# Another function is provided to verify that the Fortran and C/C++
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# compilers work together:
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# FortranCInterface_VERIFY([CXX] [QUIET])
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# It tests whether a simple test executable using Fortran and C (and
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# C++ when the CXX option is given) compiles and links successfully.
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# The result is stored in the cache entry FortranCInterface_VERIFIED_C
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# (or FortranCInterface_VERIFIED_CXX if CXX is given) as a boolean.
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# If the check fails and QUIET is not given the function terminates
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# with a FATAL_ERROR message describing the problem. The purpose of
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# this check is to stop a build early for incompatible compiler
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# combinations. The test is built in the Release configuration.
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#
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# FortranCInterface is aware of possible GLOBAL and MODULE manglings
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# for many Fortran compilers, but it also provides an interface to
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# specify new possible manglings. Set the variables
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# FortranCInterface_GLOBAL_SYMBOLS
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# FortranCInterface_MODULE_SYMBOLS
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# before including FortranCInterface to specify manglings of the
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# symbols "MySub", "My_Sub", "MyModule:MySub", and "My_Module:My_Sub".
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# For example, the code:
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# set(FortranCInterface_GLOBAL_SYMBOLS mysub_ my_sub__ MYSUB_)
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# # ^^^^^ ^^^^^^ ^^^^^
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# set(FortranCInterface_MODULE_SYMBOLS
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# __mymodule_MOD_mysub __my_module_MOD_my_sub)
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# # ^^^^^^^^ ^^^^^ ^^^^^^^^^ ^^^^^^
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# include(FortranCInterface)
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# tells FortranCInterface to try given GLOBAL and MODULE manglings.
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# (The carets point at raw symbol names for clarity in this example
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# but are not needed.)
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#=============================================================================
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# Copyright 2008-2009 Kitware, Inc.
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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# License text for the above reference.)
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#-----------------------------------------------------------------------------
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# Execute at most once in a project.
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if(FortranCInterface_SOURCE_DIR)
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return()
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endif()
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# Use CMake 2.8.0 behavior for this module regardless of including context.
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cmake_policy(PUSH)
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cmake_policy(VERSION 2.8.0)
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#-----------------------------------------------------------------------------
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# Verify that C and Fortran are available.
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foreach(lang C Fortran)
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if(NOT CMAKE_${lang}_COMPILER_LOADED)
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message(FATAL_ERROR
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"FortranCInterface requires the ${lang} language to be enabled.")
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endif()
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endforeach()
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#-----------------------------------------------------------------------------
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set(FortranCInterface_SOURCE_DIR ${CMAKE_ROOT}/Modules/FortranCInterface)
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# MinGW's make tool does not always like () in the path
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if("${CMAKE_GENERATOR}" MATCHES "MinGW" AND
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"${FortranCInterface_SOURCE_DIR}" MATCHES "[()]")
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file(COPY ${FortranCInterface_SOURCE_DIR}/
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DESTINATION ${CMAKE_BINARY_DIR}/CMakeFiles/FortranCInterfaceMinGW)
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set(FortranCInterface_SOURCE_DIR ${CMAKE_BINARY_DIR}/CMakeFiles/FortranCInterfaceMinGW)
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endif()
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# Create the interface detection project if it does not exist.
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if(NOT FortranCInterface_BINARY_DIR)
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set(FortranCInterface_BINARY_DIR ${CMAKE_BINARY_DIR}/CMakeFiles/FortranCInterface)
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include(${FortranCInterface_SOURCE_DIR}/Detect.cmake)
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endif()
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# Load the detection results.
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include(${FortranCInterface_BINARY_DIR}/Output.cmake)
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#-----------------------------------------------------------------------------
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function(FortranCInterface_HEADER file)
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# Parse arguments.
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if(IS_ABSOLUTE "${file}")
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set(FILE "${file}")
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else()
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set(FILE "${CMAKE_CURRENT_BINARY_DIR}/${file}")
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endif()
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set(MACRO_NAMESPACE "FortranCInterface_")
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set(SYMBOL_NAMESPACE)
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set(SYMBOLS)
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set(doing)
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foreach(arg ${ARGN})
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if("x${arg}" MATCHES "^x(SYMBOLS|SYMBOL_NAMESPACE|MACRO_NAMESPACE)$")
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set(doing "${arg}")
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elseif("x${doing}" MATCHES "^x(SYMBOLS)$")
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list(APPEND "${doing}" "${arg}")
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elseif("x${doing}" MATCHES "^x(SYMBOL_NAMESPACE|MACRO_NAMESPACE)$")
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set("${doing}" "${arg}")
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set(doing)
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else()
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message(AUTHOR_WARNING "Unknown argument: \"${arg}\"")
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endif()
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endforeach()
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# Generate macro definitions.
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set(HEADER_CONTENT)
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set(_desc_GLOBAL "/* Mangling for Fortran global symbols without underscores. */")
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set(_desc_GLOBAL_ "/* Mangling for Fortran global symbols with underscores. */")
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set(_desc_MODULE "/* Mangling for Fortran module symbols without underscores. */")
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set(_desc_MODULE_ "/* Mangling for Fortran module symbols with underscores. */")
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foreach(macro GLOBAL GLOBAL_ MODULE MODULE_)
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if(FortranCInterface_${macro}_MACRO)
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set(HEADER_CONTENT "${HEADER_CONTENT}
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${_desc_${macro}}
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#define ${MACRO_NAMESPACE}${macro}${FortranCInterface_${macro}_MACRO}
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")
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endif()
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endforeach()
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# Generate symbol mangling definitions.
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if(SYMBOLS)
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set(HEADER_CONTENT "${HEADER_CONTENT}
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/*--------------------------------------------------------------------------*/
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/* Mangle some symbols automatically. */
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")
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endif()
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foreach(f ${SYMBOLS})
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if("${f}" MATCHES ":")
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# Module symbol name. Parse "<module>:<function>" syntax.
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string(REPLACE ":" ";" pieces "${f}")
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list(GET pieces 0 module)
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list(GET pieces 1 function)
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string(TOUPPER "${module}" m_upper)
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string(TOLOWER "${module}" m_lower)
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string(TOUPPER "${function}" f_upper)
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string(TOLOWER "${function}" f_lower)
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if("${function}" MATCHES "_")
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set(form "_")
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else()
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set(form "")
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endif()
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if(FortranCInterface_MODULE${form}_MACRO)
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set(HEADER_CONTENT "${HEADER_CONTENT}#define ${SYMBOL_NAMESPACE}${module}_${function} ${MACRO_NAMESPACE}MODULE${form}(${m_lower},${f_lower}, ${m_upper},${f_upper})\n")
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else()
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message(AUTHOR_WARNING "No FortranCInterface mangling known for ${f}")
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endif()
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else()
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# Global symbol name.
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if("${f}" MATCHES "_")
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set(form "_")
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else()
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set(form "")
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endif()
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string(TOUPPER "${f}" f_upper)
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string(TOLOWER "${f}" f_lower)
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if(FortranCInterface_GLOBAL${form}_MACRO)
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set(HEADER_CONTENT "${HEADER_CONTENT}#define ${SYMBOL_NAMESPACE}${f} ${MACRO_NAMESPACE}GLOBAL${form}(${f_lower}, ${f_upper})\n")
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else()
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message(AUTHOR_WARNING "No FortranCInterface mangling known for ${f}")
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endif()
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endif()
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endforeach()
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# Store the content.
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configure_file(${FortranCInterface_SOURCE_DIR}/Macro.h.in ${FILE} @ONLY)
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endfunction()
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function(FortranCInterface_VERIFY)
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# Check arguments.
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set(lang C)
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set(quiet 0)
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set(verify_cxx 0)
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foreach(arg ${ARGN})
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if("${arg}" STREQUAL "QUIET")
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set(quiet 1)
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elseif("${arg}" STREQUAL "CXX")
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set(lang CXX)
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set(verify_cxx 1)
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else()
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message(FATAL_ERROR
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"FortranCInterface_VERIFY - called with unknown argument:\n ${arg}")
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endif()
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endforeach()
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if(NOT CMAKE_${lang}_COMPILER_LOADED)
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message(FATAL_ERROR
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"FortranCInterface_VERIFY(${lang}) requires ${lang} to be enabled.")
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endif()
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# Build the verification project if not yet built.
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if(NOT DEFINED FortranCInterface_VERIFIED_${lang})
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set(_desc "Verifying Fortran/${lang} Compiler Compatibility")
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message(STATUS "${_desc}")
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# Build a sample project which reports symbols.
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set(CMAKE_TRY_COMPILE_CONFIGURATION Release)
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try_compile(FortranCInterface_VERIFY_${lang}_COMPILED
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${FortranCInterface_BINARY_DIR}/Verify${lang}
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${FortranCInterface_SOURCE_DIR}/Verify
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VerifyFortranC
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CMAKE_FLAGS -DVERIFY_CXX=${verify_cxx}
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-DCMAKE_VERBOSE_MAKEFILE=ON
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"-DCMAKE_C_FLAGS:STRING=${CMAKE_C_FLAGS}"
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"-DCMAKE_CXX_FLAGS:STRING=${CMAKE_CXX_FLAGS}"
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"-DCMAKE_Fortran_FLAGS:STRING=${CMAKE_Fortran_FLAGS}"
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"-DCMAKE_C_FLAGS_RELEASE:STRING=${CMAKE_C_FLAGS_RELEASE}"
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"-DCMAKE_CXX_FLAGS_RELEASE:STRING=${CMAKE_CXX_FLAGS_RELEASE}"
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"-DCMAKE_Fortran_FLAGS_RELEASE:STRING=${CMAKE_Fortran_FLAGS_RELEASE}"
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OUTPUT_VARIABLE _output)
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file(WRITE "${FortranCInterface_BINARY_DIR}/Verify${lang}/output.txt" "${_output}")
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# Report results.
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if(FortranCInterface_VERIFY_${lang}_COMPILED)
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message(STATUS "${_desc} - Success")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"${_desc} passed with the following output:\n${_output}\n\n")
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set(FortranCInterface_VERIFIED_${lang} 1 CACHE INTERNAL "Fortran/${lang} compatibility")
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else()
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message(STATUS "${_desc} - Failed")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"${_desc} failed with the following output:\n${_output}\n\n")
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set(FortranCInterface_VERIFIED_${lang} 0 CACHE INTERNAL "Fortran/${lang} compatibility")
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endif()
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unset(FortranCInterface_VERIFY_${lang}_COMPILED CACHE)
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endif()
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# Error if compilers are incompatible.
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if(NOT FortranCInterface_VERIFIED_${lang} AND NOT quiet)
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file(READ "${FortranCInterface_BINARY_DIR}/Verify${lang}/output.txt" _output)
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string(REGEX REPLACE "\n" "\n " _output "${_output}")
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message(FATAL_ERROR
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"The Fortran compiler:\n ${CMAKE_Fortran_COMPILER}\n"
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"and the ${lang} compiler:\n ${CMAKE_${lang}_COMPILER}\n"
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"failed to compile a simple test project using both languages. "
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"The output was:\n ${_output}")
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endif()
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endfunction()
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# Restore including context policies.
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cmake_policy(POP)
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