Blame gnulib/m4/error.m4

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#serial 14
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# Copyright (C) 1996-1998, 2001-2004, 2009-2014 Free Software Foundation, Inc.
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#
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_ERROR],
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[
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  dnl We don't use AC_FUNC_ERROR_AT_LINE any more, because it is no longer
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  dnl maintained in Autoconf and because it invokes AC_LIBOBJ.
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  AC_CACHE_CHECK([for error_at_line], [ac_cv_lib_error_at_line],
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    [AC_LINK_IFELSE(
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       [AC_LANG_PROGRAM(
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          [[#include <error.h>]],
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          [[error_at_line (0, 0, "", 0, "an error occurred");]])],
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       [ac_cv_lib_error_at_line=yes],
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       [ac_cv_lib_error_at_line=no])])
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])
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# Prerequisites of lib/error.c.
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AC_DEFUN([gl_PREREQ_ERROR],
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[
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  AC_REQUIRE([AC_FUNC_STRERROR_R])
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  :
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])