2019-08-26 11:44:36 +00:00
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dnl Check to find out whether function attributes are supported.
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dnl If they are not, #define them to be nothing.
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AC_DEFUN([tinc_ATTRIBUTE],
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[
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AC_CACHE_CHECK([for working $1 attribute], tinc_cv_attribute_$1,
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[
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tempcflags="$CFLAGS"
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CFLAGS="$CFLAGS -Wall -Werror"
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AC_COMPILE_IFELSE(
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[AC_LANG_SOURCE(
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2019-08-26 11:44:52 +00:00
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[void *test(void) __attribute__ (($1));
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void *test(void) { return (void *)0; }
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2019-08-26 11:44:36 +00:00
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],
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)],
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[tinc_cv_attribute_$1=yes],
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[tinc_cv_attribute_$1=no]
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)
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CFLAGS="$tempcflags"
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])
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if test ${tinc_cv_attribute_$1} = no; then
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AC_DEFINE([$1], [], [Defined if the $1 attribute is not supported.])
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fi
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])
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