blob: 7420124f489317c26edf3c6c2382dd9294295124 (
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
|
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
CheckVariableExists
-------------------
Check if the variable exists.
.. command:: CHECK_VARIABLE_EXISTS
.. code-block:: cmake
CHECK_VARIABLE_EXISTS(VAR VARIABLE)
::
VAR - the name of the variable
VARIABLE - variable to store the result
Will be created as an internal cache variable.
This macro is only for ``C`` variables.
The following variables may be set before calling this macro to modify
the way the check is run:
``CMAKE_REQUIRED_FLAGS``
string of compile command line flags.
``CMAKE_REQUIRED_DEFINITIONS``
list of macros to define (-DFOO=bar).
``CMAKE_REQUIRED_LINK_OPTIONS``
.. versionadded:: 3.14
list of options to pass to link command.
``CMAKE_REQUIRED_LIBRARIES``
list of libraries to link.
``CMAKE_REQUIRED_QUIET``
.. versionadded:: 3.1
execute quietly without messages.
#]=======================================================================]
include_guard(GLOBAL)
macro(CHECK_VARIABLE_EXISTS VAR VARIABLE)
if(NOT DEFINED "${VARIABLE}")
set(MACRO_CHECK_VARIABLE_DEFINITIONS
"-DCHECK_VARIABLE_EXISTS=${VAR} ${CMAKE_REQUIRED_FLAGS}")
if(NOT CMAKE_REQUIRED_QUIET)
message(CHECK_START "Looking for ${VAR}")
endif()
if(CMAKE_REQUIRED_LINK_OPTIONS)
set(CHECK_VARIABLE_EXISTS_ADD_LINK_OPTIONS
LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS})
else()
set(CHECK_VARIABLE_EXISTS_ADD_LINK_OPTIONS)
endif()
if(CMAKE_REQUIRED_LIBRARIES)
set(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES
LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
else()
set(CHECK_VARIABLE_EXISTS_ADD_LIBRARIES)
endif()
try_compile(${VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_ROOT}/Modules/CheckVariableExists.c
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
${CHECK_VARIABLE_EXISTS_ADD_LINK_OPTIONS}
${CHECK_VARIABLE_EXISTS_ADD_LIBRARIES}
CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_VARIABLE_DEFINITIONS}
OUTPUT_VARIABLE OUTPUT)
if(${VARIABLE})
set(${VARIABLE} 1 CACHE INTERNAL "Have variable ${VAR}")
if(NOT CMAKE_REQUIRED_QUIET)
message(CHECK_PASS "found")
endif()
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Determining if the variable ${VAR} exists passed with the following output:\n"
"${OUTPUT}\n\n")
else()
set(${VARIABLE} "" CACHE INTERNAL "Have variable ${VAR}")
if(NOT CMAKE_REQUIRED_QUIET)
message(CHECK_FAIL "not found")
endif()
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Determining if the variable ${VAR} exists failed with the following output:\n"
"${OUTPUT}\n\n")
endif()
endif()
endmacro()
|
