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42 lines
1.2 KiB
Plaintext
42 lines
1.2 KiB
Plaintext
# iswblank.m4 serial 4
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dnl Copyright (C) 2011-2017 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_ISWBLANK],
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[
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AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])
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AC_REQUIRE([gl_WCTYPE_H])
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dnl Persuade glibc <wctype.h> to declare iswblank().
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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AC_CHECK_FUNCS_ONCE([iswblank])
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AC_CHECK_DECLS([iswblank], , , [[
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/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
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<wchar.h>.
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BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included
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before <wchar.h>. */
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#include <stddef.h>
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#include <stdio.h>
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#include <time.h>
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#include <wchar.h>
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#include <wctype.h>
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]])
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if test $ac_cv_func_iswblank = no; then
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HAVE_ISWBLANK=0
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if test $ac_cv_have_decl_iswblank = yes; then
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REPLACE_ISWBLANK=1
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fi
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fi
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if test $HAVE_ISWCNTRL = 0 || test $REPLACE_ISWCNTRL = 1; then
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dnl Redefine all of iswcntrl, ..., towupper in <wctype.h>.
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:
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else
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if test $HAVE_ISWBLANK = 0 || test $REPLACE_ISWBLANK = 1; then
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dnl Redefine only iswblank.
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:
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fi
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fi
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])
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