Re: libstdc++/2445: undefined reference to `std::errno'

[Michael Elizabeth Chastain <chastain@cygnus.com>]

The following reply was made to PR libstdc++/2445; it has been noted by GNATS.

From: Michael Elizabeth Chastain <chastain@cygnus.com>
To: gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: libstdc++/2445: undefined reference to `std::errno'
Date: Sun, 15 Apr 2001 00:41:49 -0700

 Hmmm, this patch fragment looks suspicious to me.  It handles extern "C"
 functions, and it handles extern "C" variables in the global namespace.
 I suspect that it also needs to handle extern "C" variables in subordinate
 namespaces.
 
 diff -u -r -N 2001-03-20-14-00-00/source/gcc/cp/mangle.c 2001-03-20-14-05-00/source/gcc/cp/mangle.c
 --- 2001-03-20-14-00-00/source/gcc/cp/mangle.c	Thu Feb 22 13:37:39 2001
 +++ 2001-03-20-14-05-00/source/gcc/cp/mangle.c	Tue Mar 20 14:03:45 2001
 @@ -2069,6 +2069,17 @@
  
    if (TREE_CODE (decl) == TYPE_DECL)
      write_type (TREE_TYPE (decl));
 +  else if (/* The names of `extern "C"' functions are not mangled.  */
 +	   (TREE_CODE (decl) == FUNCTION_DECL 
 +	    /* If there's no DECL_LANG_SPECIFIC, it's a function built
 +	       by language-independent code, which never builds
 +	       functions with C++ linkage.  */
 +	    && (!DECL_LANG_SPECIFIC (decl) 
 +		|| DECL_EXTERN_C_FUNCTION_P (decl)))
 +	   /* The names of global variables aren't mangled either.  */
 +	   || (TREE_CODE (decl) == VAR_DECL
 +	       && CP_DECL_CONTEXT (decl) == global_namespace))
 +    write_string (IDENTIFIER_POINTER (DECL_NAME (decl)));
    else
      {
        write_mangled_name (decl);