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1# - Check if the protoype we expect is correct.
2# check_prototype_definition(FUNCTION PROTOTYPE RETURN HEADER VARIABLE)
3#
4#  FUNCTION - The name of the function (used to check if prototype exists)
5#  PROTOTYPE- The prototype to check.
6#  RETURN - The return value of the function.
7#  HEADER - The header files required.
8#  VARIABLE - The variable to store the result.
9#
10# Example:
11#
12# check_prototype_definition(getpwent_r
13#     "struct passwd *getpwent_r(struct passwd *src, char *buf, int buflen)"
14#     "NULL"
15#     "unistd.h;pwd.h"
16#     SOLARIS_GETPWENT_R)
17#
18# The following variables may be set before calling this macro to
19# modify the way the check is run:
20#
21#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
22#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
23#  CMAKE_REQUIRED_INCLUDES = list of include directories
24#  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
25
26
27function(CHECK_PROTOTYPE_DEFINITION _FUNCTION _PROTOTYPE _RETURN _HEADER _VARIABLE)
28    if (${_VARIABLE} MATCHES "^${_VARIABLE}$")
29        set(CHECK_PROTOTYPE_DEFINITION_CONTENT "/* */\n")
30
31        set(CHECK_PROTOTYPE_DEFINITION_FLAGS ${CMAKE_REQUIRED_FLAGS})
32        if (CMAKE_REQUIRED_LIBRARIES)
33          set(CHECK_PROTOTYPE_DEFINITION_LIBS
34              "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
35        else(CMAKE_REQUIRED_LIBRARIES)
36            set(CHECK_PROTOTYPE_DEFINITION_LIBS)
37        endif(CMAKE_REQUIRED_LIBRARIES)
38        if (CMAKE_REQUIRED_INCLUDES)
39            set(CMAKE_SYMBOL_EXISTS_INCLUDES
40                "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
41        else(CMAKE_REQUIRED_INCLUDES)
42            set(CMAKE_SYMBOL_EXISTS_INCLUDES)
43        endif(CMAKE_REQUIRED_INCLUDES)
44
45        foreach(_FILE ${_HEADER})
46          set(CHECK_PROTOTYPE_DEFINITION_HEADER
47            "${CHECK_PROTOTYPE_DEFINITION_HEADER}#include <${_FILE}>\n")
48        endforeach(_FILE)
49
50        set(CHECK_PROTOTYPE_DEFINITION_SYMBOL ${_FUNCTION})
51        set(CHECK_PROTOTYPE_DEFINITION_PROTO ${_PROTOTYPE})
52        set(CHECK_PROTOTYPE_DEFINITION_RETURN ${_RETURN})
53
54        configure_file("${PROJECT_SOURCE_DIR}/cmake/CheckPrototypeDefinition.c.in"
55            "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckPrototypeDefinition.c" @ONLY)
56
57        file(READ ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckPrototypeDefinition.c _SOURCE)
58
59        try_compile(${_VARIABLE}
60          ${CMAKE_BINARY_DIR}
61          ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckPrototypeDefinition.c
62          COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
63          CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${CHECK_PROTOTYPE_DEFINITION_FLAGS}
64          "${CHECK_PROTOTYPE_DEFINITION_LIBS}"
65          "${CMAKE_SYMBOL_EXISTS_INCLUDES}"
66          OUTPUT_VARIABLE OUTPUT)
67
68        if (${_VARIABLE})
69            set(${_VARIABLE} 1 CACHE INTERNAL "Have correct prototype for ${_FUNCTION}")
70            message(STATUS "Checking prototype ${_FUNCTION} for ${_VARIABLE} - True")
71            file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
72                "Determining if the prototype ${_FUNCTION} exists for ${_VARIABLE} passed with the following output:\n"
73                "${OUTPUT}\n\n")
74        else (${_VARIABLE})
75            message(STATUS "Checking prototype ${_FUNCTION} for ${_VARIABLE} - False")
76            set(${_VARIABLE} 0 CACHE INTERNAL "Have correct prototype for ${_FUNCTION}")
77            file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
78                "Determining if the prototype ${_FUNCTION} exists for ${_VARIABLE} failed with the following output:\n"
79                "${OUTPUT}\n\n${_SOURCE}\n\n")
80        endif (${_VARIABLE})
81    endif()
82endfunction(CHECK_PROTOTYPE_DEFINITION)
83