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-rw-r--r--Build/source/texk/web2c/luatexdir/zziplib/m4/acx_restrict.m432
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diff --git a/Build/source/texk/web2c/luatexdir/zziplib/m4/acx_restrict.m4 b/Build/source/texk/web2c/luatexdir/zziplib/m4/acx_restrict.m4
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index 333f2592df4..00000000000
--- a/Build/source/texk/web2c/luatexdir/zziplib/m4/acx_restrict.m4
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-dnl @synopsis ACX_C_RESTRICT
-dnl
-dnl This macro determines whether the C compiler supports the "restrict"
-dnl keyword introduced in ANSI C99, or an equivalent. Does nothing if
-dnl the compiler accepts the keyword. Otherwise, if the compiler supports
-dnl an equivalent (like gcc's __restrict__) defines "restrict" to be that.
-dnl Otherwise, defines "restrict" to be empty.
-dnl
-dnl @version $Id: acx_restrict.m4,v 1.1 2005/12/09 07:47:34 guidod Exp $
-dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
-
-AC_DEFUN([ACX_C_RESTRICT],
-[AC_CACHE_CHECK([for C restrict keyword], acx_cv_c_restrict,
-[acx_cv_c_restrict=unsupported
- AC_LANG_SAVE
- AC_LANG_C
- # Try the official restrict keyword, then gcc's __restrict__, then
- # SGI's __restrict. __restrict has slightly different semantics than
- # restrict (it's a bit stronger, in that __restrict pointers can't
- # overlap even with non __restrict pointers), but I think it should be
- # okay under the circumstances where restrict is normally used.
- for acx_kw in restrict __restrict__ __restrict; do
- AC_TRY_COMPILE([], [float * $acx_kw x;], [acx_cv_c_restrict=$acx_kw; break])
- done
- AC_LANG_RESTORE
-])
- if test "$acx_cv_c_restrict" != "restrict"; then
- acx_kw="$acx_cv_c_restrict"
- if test "$acx_kw" = unsupported; then acx_kw=""; fi
- AC_DEFINE_UNQUOTED(restrict, $acx_kw, [Define to equivalent of C99 restrict keyword, or to nothing if this is not supported. Do not define if restrict is supported directly.])
- fi
-])