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annotate m4/fpurge.m4 @ 17921:58c1b50299a6

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getopt: give accurate ambiguity diagnostic on mem exhaustion * lib/getopt.c (_getopt_internal_r): The previous commit broke out the loop too early, which could give a false indication of ambiguous options under memory exhaustion.
author Pádraig Brady <P@draigBrady.com>
date Wed, 18 Feb 2015 22:37:31 +0000
parents ab58d4870664
children
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Bruno Haible <bruno@clisp.org>
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1 # fpurge.m4 serial 7
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Paul Eggert <eggert@cs.ucla.edu>
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2 dnl Copyright (C) 2007, 2009-2015 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_FPURGE],
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8 [
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9 AC_REQUIRE([gl_STDIO_H_DEFAULTS])
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10 AC_CHECK_FUNCS_ONCE([fpurge])
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11 AC_CHECK_FUNCS_ONCE([__fpurge])
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12 AC_CHECK_DECLS([fpurge], , , [[#include <stdio.h>]])
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13 if test "x$ac_cv_func_fpurge" = xyes; then
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14 HAVE_FPURGE=1
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15 # Detect BSD bug. Only cygwin 1.7 is known to be immune.
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16 AC_CACHE_CHECK([whether fpurge works], [gl_cv_func_fpurge_works],
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17 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>
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18 ]], [FILE *f = fopen ("conftest.txt", "w+");
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19 if (!f) return 1;
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20 if (fputc ('a', f) != 'a') return 2;
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21 rewind (f);
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22 if (fgetc (f) != 'a') return 3;
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23 if (fgetc (f) != EOF) return 4;
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24 if (fpurge (f) != 0) return 5;
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25 if (putc ('b', f) != 'b') return 6;
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26 if (fclose (f) != 0) return 7;
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27 if ((f = fopen ("conftest.txt", "r")) == NULL) return 8;
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28 if (fgetc (f) != 'a') return 9;
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29 if (fgetc (f) != 'b') return 10;
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30 if (fgetc (f) != EOF) return 11;
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31 if (fclose (f) != 0) return 12;
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32 if (remove ("conftest.txt") != 0) return 13;
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33 return 0;])],
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34 [gl_cv_func_fpurge_works=yes], [gl_cv_func_fpurge_works=no],
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35 [gl_cv_func_fpurge_works='guessing no'])])
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36 if test "x$gl_cv_func_fpurge_works" != xyes; then
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37 REPLACE_FPURGE=1
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38 fi
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39 else
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40 HAVE_FPURGE=0
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41 fi
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42 if test "x$ac_cv_have_decl_fpurge" = xno; then
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43 HAVE_DECL_FPURGE=0
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44 fi
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45 ])