Blame m4/ac_have_attribute.m4
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AC_DEFUN([AX_C___ATTRIBUTE__], [
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AC_MSG_CHECKING(for __attribute__)
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AC_CACHE_VAL(ac_cv___attribute__, [
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AC_TRY_COMPILE(
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[#include <stdlib.h>
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static void foo(void) __attribute__ ((unused));
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void foo(void) { exit(1); }],
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[],
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ac_cv___attribute__=yes,
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ac_cv___attribute__=no
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)])
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if test "$ac_cv___attribute__" = "yes"; then
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AC_DEFINE(HAVE___ATTRIBUTE__, 1, [define if your compiler has __attribute__])
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fi
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AC_MSG_RESULT($ac_cv___attribute__)
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])
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