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Diffstat (limited to 'm4/iswblank.m4')
| -rw-r--r-- | m4/iswblank.m4 | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/m4/iswblank.m4 b/m4/iswblank.m4 new file mode 100644 index 0000000..ddecf9b --- /dev/null +++ b/m4/iswblank.m4 @@ -0,0 +1,34 @@ +# 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 + +]) |