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m4: avoid a warning from gcc's -Wstrict-prototypes
* m4/jm-macros.m4 (ARGMATCH_DIE_DECL): Use proper prototype for usage.
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@@ -38,7 +38,7 @@ AC_DEFUN([coreutils_MACROS],
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# By default, argmatch should fail calling usage (1).
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AC_DEFINE(ARGMATCH_DIE, [usage (1)],
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[Define to the function xargmatch calls on failures.])
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AC_DEFINE(ARGMATCH_DIE_DECL, [void usage ()],
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AC_DEFINE(ARGMATCH_DIE_DECL, [void usage (int _e)],
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[Define to the declaration of the xargmatch failure function.])
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# used by ls
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