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515bc96855
* m4/labels-as-values.m4: More m4 quoting love. Patch from C. K. Jester-Young <cky944 <at> gmail.com>.
22 lines
605 B
Text
22 lines
605 B
Text
dnl check for gcc's "labels as values" feature
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AC_DEFUN([AC_C_LABELS_AS_VALUES],
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[AC_CACHE_CHECK([labels as values], ac_cv_labels_as_values,
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[AC_TRY_COMPILE([
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int foo(int);
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int foo(i)
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int i; {
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static void *label[] = { &&l1, &&l2 };
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goto *label[i];
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l1: return 1;
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l2: return 2;
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}
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],
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[int i;],
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ac_cv_labels_as_values=yes,
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ac_cv_labels_as_values=no)])
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if test "$ac_cv_labels_as_values" = yes; then
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AC_DEFINE([HAVE_LABELS_AS_VALUES], [],
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[Define if compiler supports gcc's "labels as values" (aka computed goto)
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feature, used to speed up instruction dispatch in the interpreter.])
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fi
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])
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