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-rw-r--r--gl/m4/isblank.m417
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+# isblank.m4 serial 3
+dnl Copyright (C) 2009-2022 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_ISBLANK],
+[
+ dnl Persuade glibc <ctype.h> to declare isblank().
+ AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
+
+ AC_REQUIRE([gl_CTYPE_H_DEFAULTS])
+ AC_CHECK_FUNCS_ONCE([isblank])
+ if test $ac_cv_func_isblank = no; then
+ HAVE_ISBLANK=0
+ fi
+])