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macro(CHECK_TYPE_ALIGNMENT TYPE NAME)
if(NOT ${NAME})
message(STATUS "Check alignment of ${TYPE}")
set(INCLUDE_HEADERS "#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>")
if(HAVE_STDINT_H)
set(INCLUDE_HEADERS "${INCLUDE_HEADERS}\n#include <stdint.h>\n")
endif(HAVE_STDINT_H)
file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/check_${NAME}_alignment.c"
"${INCLUDE_HEADERS}
int main(){
char diff;
struct foo {char a; ${TYPE} b;};
struct foo *p = (struct foo *) malloc(sizeof(struct foo));
diff = ((char *)&p->b) - ((char *)&p->a);
return diff;}
")
try_run(${NAME} COMPILE_RESULT "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/"
"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/check_${NAME}_alignment.c")
message(STATUS "Check alignment of ${TYPE} - ${${NAME}}")
endif(NOT ${NAME})
endmacro()
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