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-rw-r--r--m4/iswblank.m434
1 files changed, 34 insertions, 0 deletions
diff --git a/m4/iswblank.m4 b/m4/iswblank.m4
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+# iswblank.m4 serial 5
+dnl Copyright (C) 2011-2022 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_ISWBLANK],
+[
+ AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])
+ AC_REQUIRE([gl_WCTYPE_H])
+ dnl Persuade glibc <wctype.h> to declare iswblank().
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ AC_CHECK_FUNCS_ONCE([iswblank])
+ AC_CHECK_DECLS([iswblank], , , [[
+ #include <wchar.h>
+ #include <wctype.h>
+ ]])
+ if test $ac_cv_func_iswblank = no; then
+ HAVE_ISWBLANK=0
+ if test $ac_cv_have_decl_iswblank = yes; then
+ REPLACE_ISWBLANK=1
+ fi
+ fi
+ if test $HAVE_ISWCNTRL = 0 || test $REPLACE_ISWCNTRL = 1; then
+ dnl Redefine all of iswcntrl, ..., towupper in <wctype.h>.
+ :
+ else
+ if test $HAVE_ISWBLANK = 0 || test $REPLACE_ISWBLANK = 1; then
+ dnl Redefine only iswblank.
+ :
+ fi
+ fi
+
+])