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-rw-r--r--Modules/CheckConstantExists.cmake38
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diff --git a/Modules/CheckConstantExists.cmake b/Modules/CheckConstantExists.cmake
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1# - Check if the given constant exists (as an enum, define, or whatever)
2# CHECK_CONSTANT_EXISTS (CONSTANT HEADER VARIABLE)
3#
4# CONSTANT - the name of the constant you are interested in
5# HEADER - the header(s) where the prototype should be declared
6# VARIABLE - variable to store the result
7#
8# The following variables may be set before calling this macro to
9# modify the way the check is run:
10#
11# CMAKE_REQUIRED_FLAGS = string of compile command line flags
12# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
13# CMAKE_REQUIRED_INCLUDES = list of include directories
14#
15# Example: CHECK_CONSTANT_EXISTS(O_NOFOLLOW fcntl.h HAVE_O_NOFOLLOW)
16
17
18INCLUDE(CheckCSourceCompiles)
19
20MACRO (CHECK_CONSTANT_EXISTS _CONSTANT _HEADER _RESULT)
21 SET(_INCLUDE_FILES)
22 FOREACH (it ${_HEADER})
23 SET(_INCLUDE_FILES "${_INCLUDE_FILES}#include <${it}>\n")
24 ENDFOREACH (it)
25
26 SET(_CHECK_CONSTANT_SOURCE_CODE "
27${_INCLUDE_FILES}
28void cmakeRequireConstant(int dummy,...){(void)dummy;}
29int main()
30{
31 cmakeRequireConstant(0,${_CONSTANT});
32 return 0;
33}
34")
35 CHECK_C_SOURCE_COMPILES("${_CHECK_CONSTANT_SOURCE_CODE}" ${_RESULT})
36
37ENDMACRO (CHECK_CONSTANT_EXISTS)
38