2004-04-03 21:22:55 +00:00
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dnl $Id: check-declaration.m4,v 1.3.34.1 2004/04/01 07:27:32 joda Exp $
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2000-01-09 20:58:00 +00:00
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dnl
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dnl
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dnl Check if we need the declaration of a variable
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dnl
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dnl AC_HAVE_DECLARATION(includes, variable)
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2004-04-03 21:22:55 +00:00
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AC_DEFUN([AC_CHECK_DECLARATION], [
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2000-01-09 20:58:00 +00:00
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AC_MSG_CHECKING([if $2 is properly declared])
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AC_CACHE_VAL(ac_cv_var_$2_declaration, [
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AC_TRY_COMPILE([$1
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extern struct { int foo; } $2;],
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[$2.foo = 1;],
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eval "ac_cv_var_$2_declaration=no",
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eval "ac_cv_var_$2_declaration=yes")
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])
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define(foo, [HAVE_]translit($2, [a-z], [A-Z])[_DECLARATION])
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AC_MSG_RESULT($ac_cv_var_$2_declaration)
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if eval "test \"\$ac_cv_var_$2_declaration\" = yes"; then
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AC_DEFINE(foo, 1, [define if your system declares $2])
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fi
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undefine([foo])
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])
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