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include(CheckCSourceCompiles)
macro(check_const_exists CONST FILES VARIABLE)
if (DEFINED ${VARIABLE})
IF(${VARIABLE} STREQUAL "")
# Set, but empty: unset it to do the checking below.
UNSET(${VARIABLE})
UNSET(${VARIABLE} CACHE)
ENDIF()
endif()
if (NOT DEFINED ${VARIABLE})
set(check_const_exists_source "")
foreach(file ${FILES})
set(check_const_exists_source
"${check_const_exists_source}
#include <${file}>")
endforeach()
set(check_const_exists_source
"${check_const_exists_source}
int main() { (void)${CONST}; return 0; }")
check_c_source_compiles("${check_const_exists_source}" ${VARIABLE})
if (${${VARIABLE}})
set(${VARIABLE} 1 CACHE INTERNAL "Have const ${CONST}")
message(STATUS "Looking for ${CONST} - found")
else()
set(${VARIABLE} 0 CACHE INTERNAL "Have const ${CONST}")
message(STATUS "Looking for ${CONST} - not found")
endif()
endif()
endmacro(check_const_exists)