wctype-h: Add support for Minix.

[gnulib.git] / m4 / wctype_h.m4

diff --git a/m4/wctype_h.m4 b/m4/wctype_h.m4
index ef9fb04..6df403b 100644 (file)
--- a/m4/wctype_h.m4
+++ b/m4/wctype_h.m4
@@ -1,4 +1,4 @@
-# wctype_h.m4 serial 14
+# wctype_h.m4 serial 15
 
 dnl A placeholder for ISO C99 <wctype.h>, for platforms that lack it.
 
@@ -75,7 +75,39 @@ AC_DEFUN([gl_WCTYPE_H],
   AC_SUBST([REPLACE_ISWCNTRL])
 
   if test $HAVE_ISWCNTRL = 0 || test $REPLACE_ISWCNTRL = 1; then
-    dnl Redefine all of iswcntrl, ..., towupper in <wctype.h>.
+    dnl Redefine all of iswcntrl, ..., iswxdigit in <wctype.h>.
+    :
+  fi
+
+  if test $REPLACE_ISWCNTRL = 1; then
+    REPLACE_TOWLOWER=1
+  else
+    AC_CHECK_DECLS([towlower],,,
+      [[/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be
+           included before <wchar.h>.
+           BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h>
+           must be included before <wchar.h>.  */
+        #include <stddef.h>
+        #include <stdio.h>
+        #include <time.h>
+        #include <wchar.h>
+        #if HAVE_WCTYPE_H
+        # include <wctype.h>
+        #endif
+      ]])
+    if test $ac_cv_have_decl_towlower = yes; then
+      dnl On Minix 3.1.8, the system's <wctype.h> declares towlower() and
+      dnl towupper() although it does not have the functions. Avoid a collision
+      dnl with gnulib's replacement.
+      REPLACE_TOWLOWER=1
+    else
+      REPLACE_TOWLOWER=0
+    fi
+  fi
+  AC_SUBST([REPLACE_TOWLOWER])
+
+  if test $HAVE_ISWCNTRL = 0 || test $REPLACE_TOWLOWER = 1; then
+    dnl Redefine towlower, towupper in <wctype.h>.
     :
   fi