xref: /freebsd-src/contrib/libevent/cmake/CheckPrototypeDefinition.cmake (revision b50261e21f39a6c7249a49e7b60aa878c98512a8) 
1*b50261e2SCy Schubert# - Check if the protoype we expect is correct.
2*b50261e2SCy Schubert# check_prototype_definition(FUNCTION PROTOTYPE RETURN HEADER VARIABLE)
3*b50261e2SCy Schubert#
4*b50261e2SCy Schubert#  FUNCTION - The name of the function (used to check if prototype exists)
5*b50261e2SCy Schubert#  PROTOTYPE- The prototype to check.
6*b50261e2SCy Schubert#  RETURN - The return value of the function.
7*b50261e2SCy Schubert#  HEADER - The header files required.
8*b50261e2SCy Schubert#  VARIABLE - The variable to store the result.
9*b50261e2SCy Schubert#
10*b50261e2SCy Schubert# Example:
11*b50261e2SCy Schubert#
12*b50261e2SCy Schubert# check_prototype_definition(getpwent_r
13*b50261e2SCy Schubert#     "struct passwd *getpwent_r(struct passwd *src, char *buf, int buflen)"
14*b50261e2SCy Schubert#     "NULL"
15*b50261e2SCy Schubert#     "unistd.h;pwd.h"
16*b50261e2SCy Schubert#     SOLARIS_GETPWENT_R)
17*b50261e2SCy Schubert#
18*b50261e2SCy Schubert# The following variables may be set before calling this macro to
19*b50261e2SCy Schubert# modify the way the check is run:
20*b50261e2SCy Schubert#
21*b50261e2SCy Schubert#  CMAKE_REQUIRED_FLAGS = string of compile command line flags
22*b50261e2SCy Schubert#  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
23*b50261e2SCy Schubert#  CMAKE_REQUIRED_INCLUDES = list of include directories
24*b50261e2SCy Schubert#  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
25*b50261e2SCy Schubert
26*b50261e2SCy Schubert
27*b50261e2SCy Schubertfunction(CHECK_PROTOTYPE_DEFINITION _FUNCTION _PROTOTYPE _RETURN _HEADER _VARIABLE)
28*b50261e2SCy Schubert    if (${_VARIABLE} MATCHES "^${_VARIABLE}$")
29*b50261e2SCy Schubert        set(CHECK_PROTOTYPE_DEFINITION_CONTENT "/* */\n")
30*b50261e2SCy Schubert
31*b50261e2SCy Schubert        set(CHECK_PROTOTYPE_DEFINITION_FLAGS ${CMAKE_REQUIRED_FLAGS})
32*b50261e2SCy Schubert        if (CMAKE_REQUIRED_LIBRARIES)
33*b50261e2SCy Schubert          set(CHECK_PROTOTYPE_DEFINITION_LIBS
34*b50261e2SCy Schubert              "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
35*b50261e2SCy Schubert        else(CMAKE_REQUIRED_LIBRARIES)
36*b50261e2SCy Schubert            set(CHECK_PROTOTYPE_DEFINITION_LIBS)
37*b50261e2SCy Schubert        endif(CMAKE_REQUIRED_LIBRARIES)
38*b50261e2SCy Schubert        if (CMAKE_REQUIRED_INCLUDES)
39*b50261e2SCy Schubert            set(CMAKE_SYMBOL_EXISTS_INCLUDES
40*b50261e2SCy Schubert                "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
41*b50261e2SCy Schubert        else(CMAKE_REQUIRED_INCLUDES)
42*b50261e2SCy Schubert            set(CMAKE_SYMBOL_EXISTS_INCLUDES)
43*b50261e2SCy Schubert        endif(CMAKE_REQUIRED_INCLUDES)
44*b50261e2SCy Schubert
45*b50261e2SCy Schubert        foreach(_FILE ${_HEADER})
46*b50261e2SCy Schubert          set(CHECK_PROTOTYPE_DEFINITION_HEADER
47*b50261e2SCy Schubert            "${CHECK_PROTOTYPE_DEFINITION_HEADER}#include <${_FILE}>\n")
48*b50261e2SCy Schubert        endforeach(_FILE)
49*b50261e2SCy Schubert
50*b50261e2SCy Schubert        set(CHECK_PROTOTYPE_DEFINITION_SYMBOL ${_FUNCTION})
51*b50261e2SCy Schubert        set(CHECK_PROTOTYPE_DEFINITION_PROTO ${_PROTOTYPE})
52*b50261e2SCy Schubert        set(CHECK_PROTOTYPE_DEFINITION_RETURN ${_RETURN})
53*b50261e2SCy Schubert
54*b50261e2SCy Schubert        configure_file("${PROJECT_SOURCE_DIR}/cmake/CheckPrototypeDefinition.c.in"
55*b50261e2SCy Schubert            "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckPrototypeDefinition.c" @ONLY)
56*b50261e2SCy Schubert
57*b50261e2SCy Schubert        file(READ ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckPrototypeDefinition.c _SOURCE)
58*b50261e2SCy Schubert
59*b50261e2SCy Schubert        try_compile(${_VARIABLE}
60*b50261e2SCy Schubert          ${CMAKE_BINARY_DIR}
61*b50261e2SCy Schubert          ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckPrototypeDefinition.c
62*b50261e2SCy Schubert          COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
63*b50261e2SCy Schubert          CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${CHECK_PROTOTYPE_DEFINITION_FLAGS}
64*b50261e2SCy Schubert          "${CHECK_PROTOTYPE_DEFINITION_LIBS}"
65*b50261e2SCy Schubert          "${CMAKE_SYMBOL_EXISTS_INCLUDES}"
66*b50261e2SCy Schubert          OUTPUT_VARIABLE OUTPUT)
67*b50261e2SCy Schubert
68*b50261e2SCy Schubert        if (${_VARIABLE})
69*b50261e2SCy Schubert            set(${_VARIABLE} 1 CACHE INTERNAL "Have correct prototype for ${_FUNCTION}")
70*b50261e2SCy Schubert            message(STATUS "Checking prototype ${_FUNCTION} for ${_VARIABLE} - True")
71*b50261e2SCy Schubert            file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
72*b50261e2SCy Schubert                "Determining if the prototype ${_FUNCTION} exists for ${_VARIABLE} passed with the following output:\n"
73*b50261e2SCy Schubert                "${OUTPUT}\n\n")
74*b50261e2SCy Schubert        else (${_VARIABLE})
75*b50261e2SCy Schubert            message(STATUS "Checking prototype ${_FUNCTION} for ${_VARIABLE} - False")
76*b50261e2SCy Schubert            set(${_VARIABLE} 0 CACHE INTERNAL "Have correct prototype for ${_FUNCTION}")
77*b50261e2SCy Schubert            file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
78*b50261e2SCy Schubert                "Determining if the prototype ${_FUNCTION} exists for ${_VARIABLE} failed with the following output:\n"
79*b50261e2SCy Schubert                "${OUTPUT}\n\n${_SOURCE}\n\n")
80*b50261e2SCy Schubert        endif (${_VARIABLE})
81*b50261e2SCy Schubert    endif()
82*b50261e2SCy Schubertendfunction(CHECK_PROTOTYPE_DEFINITION)
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