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7.3 ·ë²Ì¤Î¥­¥ã¥Ã¥·¥å

ÍÍ¡¹¤Êconfigure¥¹¥¯¥ê¥×¥È¤Ç¡¤Æ±¤¸ÆÃħ¤ò·«¤êÊÖ¤·Ä´ºº¤¹¤ë(¤¢¤ë¤¤ ¤Ï²¿ÅÙ¤â°ì¤Ä¤Î¥¹¥¯¥ê¥×¥È¤ò¼Â¹Ô¤¹¤ë)¤³¤È¤òÈò¤±¤ë¤¿¤á¡¤configure ¤Ï¡¤Â¿¤¯¤ÎÄ´ºº·ë²Ì¤ò¥­¥ã¥Ã¥·¥å¥Õ¥¡¥¤¥ë(cache file)¤ËÊݸ¤·¤Þ¤¹ (see Cache Files)¡¥¥­¥ã¥Ã¥·¥å²Äǽ¤Ê¾õÂÖ¤Çconfigure ¥¹¥¯¥ê ¥×¥È¤ò¼Â¹Ô¤·¤Æ¤¤¤Æ¥­¥ã¥Ã¥·¥å¥Õ¥¡¥¤¥ë¤¬¸«¤Ä¤«¤Ã¤¿¾ì¹ç¡¤Á°²ó¤Î¼Â¹Ô·ë²Ì¤ò ¥­¥ã¥Ã¥·¥å¤«¤éÆÉ¤ß¹þ¤ß¡¤¤³¤ì¤é¤ÎÄ´ºº¤ÎºÆ¼Â¹Ô¤òÈò¤±¤Þ¤¹¡¥·ë²Ì¤È¤·¤Æ¡¤ configure¤Ï¡¤Ëè²óÁ´¤Æ¤ÎÄ´ºº¤ò¼Â¹Ô¤¹¤ë¤è¤êÁ᤯¤Ê¤ê¤Þ¤¹¡¥

Macro: AC_CACHE_VAL (cache-id, commands-to-set-it)

cache-id¤Ç¼±Ê̤·¤¿Ä´ºº·ë²Ì¤¬¡¤ÍøÍѲÄǽ¤À¤È¤¤¤¦¤³¤È¤òÊݾڤ·¤Þ¤¹¡¥Ä´ ºº·ë²Ì¤¬ÆÉ¤ß¹þ¤Þ¤ì¤¿¥­¥ã¥Ã¥·¥å¥Õ¥¡¥¤¥ë¤Ë¤¢¤ê¡¤configure¤Ë¡¤ ‘--quiet’¤ä‘--silent’¥ª¥×¥·¥ç¥ó¤¬Í¿¤¨¤é¤ì¤Æ¤¤¤Ê¤¤¾ì¹ç¡¤·ë²Ì¤¬ ¥­¥ã¥Ã¥·¥å¤µ¤ì¤Æ¤¤¤ë¤³¤È¤ò¼¨¤¹¥á¥Ã¥»¡¼¥¸¤ò½ÐÎϤ·¤Þ¤¹¡¥¤½¤ì°Ê³°¤Ç¤Ï¡¤¥·¥§ ¥ë¥³¥Þ¥ó¥Écommands-to-set-it¤ò¼Â¹Ô¤·¤Þ¤¹¡¥¥·¥§¥ë¥³¥Þ¥ó¥É¤òÃͤò·èÄê ¤¹¤ë¤¿¤á¤Ë¼Â¹Ô¤¹¤ë¾ì¹ç¡¤configure¤¬½ÐÎÏ¥Õ¥¡¥¤¥ë¤òºîÀ®¤¹¤ëľÁ° ¤Ë¡¤Ãͤò¥­¥ã¥Ã¥·¥å¥Õ¥¡¥¤¥ë¤ËÊݸ¤·¤Þ¤¹¡¥cache-idÊÑ¿ô¤Î̾Á°¤òÁªÂò¤¹ ¤ëÊýË¡¤Ï¡¤See Cache Variable Names.

commands-to-set-it¤Ï¡¤ÀßÄꤵ¤ì¤¿ÊÑ¿ôcache-id°Ê³°¤ËÉûºî ÍѤ¬¤Ê¤¤¤Ï¤º¤Ç¤¹¡¥°Ê²¼¤ò»²¾È¤·¤Æ¤¯¤À¤µ¤¤¡¥

Macro: AC_CACHE_CHECK (message, cache-id, commands-to-set-it)

¥á¥Ã¥»¡¼¥¸½ÐÎϤËÃí°Õ¤¬É¬ÍפÊAC_CACHE_VAL¤Î¥é¥Ã¥Ñ¡¼¤Ç¤¹¡¥¤³¤Î¥Þ¥¯ ¥í¤Ï¡¤¤³¤ì¤é¤Î¥Þ¥¯¥í¤ò»ÈÍѤ¹¤ëºÇ¤â°ìÈÌŪ¤ÊÊýË¡¤ËÂФ·¤Æ¡¤ÊØÍø¤Êάµ­Ë¡¤òÄó ¶¡¤·¤Þ¤¹¡¥¤½¤ì¤Ï¡¤message¤ËÂФ·¤ÆAC_MSG_CHECKING¤ò¸Æ¤Ó½Ð¤·¡¤ ¤½¤Î¸å¤Ç¡¤cache-id¤Ècommands°ú¿ô¤òȼ¤¦AC_CACHE_VAL¤È¡¤ cache-id¤òȼ¤¦AC_MSG_RESULT¤ò¸Æ¤Ó½Ð¤·¤Þ¤¹¡¥

commands-to-set-it¤Ï¡¤ÀßÄꤵ¤ì¤¿ÊÑ¿ôcache-id°Ê³°¤ËÉûºî ÍѤ¬¤Ê¤¤¤Ï¤º¤Ç¤¹¡¥°Ê²¼¤ò»²¾È¤·¤Æ¤¯¤À¤µ¤¤¡¥

commands-to-set-it¤ÇAC_DEFINE¤Î¸Æ¤Ó½Ð¤·¤ò»î¤ß¤ë¤¿¤á¡¤ AC_CACHE_VAL¤äAC_CACHE_CHECK¤ò»ÈÍѤ·¤Æ¤¤¤ë¥Ð¥°¤Î¿¤¤¥Þ¥¯¥í ¤òȯ¸«¤¹¤ë¤³¤È¤Ï¤è¤¯¤¢¤ê¤Þ¤¹¡¥¤½¤ÎÂå¤ï¤ê¤Ë¡¤AC_CACHE_VAL¤ò¸Æ¤Ó½Ð ¤·¤Æ¤¤¤ë°Ê²¼¤Î¤è¤¦¤Ê¥³¡¼¥É¤Ç¤Ï¡¤¥­¥ã¥Ã¥·¥åÊÑ¿ô¤ÎÃͤòÄ´¤Ù¤ë¤³¤È¤Ç¡¤ AC_DEFINE¤ò¸Æ¤Ó½Ð¤¹¤Ù¤­¤Ç¤¹¡¥Î㤨¤Ð¡¤°Ê²¼¤Î¥Þ¥¯¥í¤ÏÂÌÌܤǤ¹¡¥

AC_DEFUN([AC_SHELL_TRUE],
[AC_CACHE_CHECK([whether true(1) works], [ac_cv_shell_true_works],
                [ac_cv_shell_true_works=no
                 true && ac_cv_shell_true_works=yes
                 if test $ac_cv_shell_true_works = yes; then
                   AC_DEFINE([TRUE_WORKS], 1
                             [Define if `true(1)' works properly.])
                 fi])
])

¤³¤ì¤Ï¡¤¥­¥ã¥Ã¥·¥å¤¬ÍøÍѲÄǽ¤Ê¾ì¹ç¡¤¼ºÇÔ¤·¤Þ¤¹¡¥¤³¤Î¥Þ¥¯¥í¤ÎÆó²óÌÜ¤Î¼Â¹Ô ¤Ç¡¤TRUE_WORKS¤ÏÄêµÁ¤µ¤ì¤Æ¤¤¤Ê¤¤¤Ç¤·¤ç¤¦¡¥Å¬ÀڤʼÂÁõ¤Ï°Ê²¼ ¤Î¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹¡¥

AC_DEFUN([AC_SHELL_TRUE],
[AC_CACHE_CHECK([whether true(1) works], [ac_cv_shell_true_works],
                [ac_cv_shell_true_works=no
                 true && ac_cv_shell_true_works=yes])
 if test $ac_cv_shell_true_works = yes; then
   AC_DEFINE([TRUE_WORKS], 1
             [Define if `true(1)' works properly.])
 fi
])

¤Þ¤¿¡¤commands-to-set-it¤Ç¤Ï¡¤Î㤨¤ÐAC_MSG_CHECKING¤òÍѤ¤¤Æ ¥á¥Ã¥»¡¼¥¸¤ò½ÐÎϤ¹¤Ù¤­¤Ç¤Ï¤¢¤ê¤Þ¤»¤ó¡¥Ä´ºº¤Î·ë²Ì¤¬¥­¥ã¥Ã¥·¥å¤«¤é¼è¤ê½Ð¤µ ¤ì¤ë¤«¡¤¥·¥§¥ë¥³¥Þ¥ó¥É¤Î¼Â¹Ô¤Ç·èÄꤵ¤ì¤ë¤«¤Ë°Í¸¤»¤º¥á¥Ã¥»¡¼¥¸¤¬½ÐÎϤµ¤ì ¤ë¤Î¤Ç¡¤AC_CACHE_VAL¤Î¸Æ¤Ó½Ð¤·¤ÎÁ°¤Ë¤·¤Æ¤¯¤À¤µ¤¤¡¥