docbook: Fix Sun CC warning on ptr_fun(isalnum)

The Sun compiler complains:

 cmDocumentationFormatterDocbook.cxx", line 230: Warning (Anachronism),
 badargtype2w: Formal argument x of type int(*)(int) in call to
 std::ptr_fun<int, int>(int(*)(int)) is being passed
 extern "C" int(*)(int).

Add an intermediate C++ function to forward to the C function.

1 files changed, 8 insertions, 1 deletions

diff --git a/Source/cmDocumentationFormatterDocbook.cxx b/Source/cmDocumentationFormatterDocbook.cxx
index a2ae20b..706ce0a 100644
--- a/Source/cmDocumentationFormatterDocbook.cxx
+++ b/Source/cmDocumentationFormatterDocbook.cxx
@@ -13,6 +13,12 @@
 #include "cmDocumentationSection.h"
 #include <algorithm>
 #include <ctype.h> // for isalnum
+
+static int cmIsAlnum(int c)
+{
+  return isalnum(c);
+}
+
 //----------------------------------------------------------------------------
 
 // this function is a copy of the one in the HTML formatter
@@ -224,7 +230,8 @@ void cmDocumentationFormatterDocbook::PrintFooter(std::ostream& os)
 void cmDocumentationFormatterDocbook
 ::PrintId(std::ostream& os, const char* prefix, std::string id)
 {
-  std::replace_if(id.begin(), id.end(), std::not1(std::ptr_fun(isalnum)), '_');
+  std::replace_if(id.begin(), id.end(),
+                  std::not1(std::ptr_fun(cmIsAlnum)), '_');
   if(prefix)
     {
     id = std::string(prefix) + "." + id;