2.95.3 fix request: inline asm in C++ templates fix

[Hidvegi <hzoli at austin dot ibm dot com>]

The following program produces bad assembly output with

g++ -O3 -S foo.C

---------------------- CUT HERE ----------------------
template <class T>
class tmpl {
public:
    static int foo(void);
};

template <class T>
int
tmpl<T>::foo(void)
{
  int g;

  __asm__ ("bad" "bad" : "=r" (g));

  return g;
}

template tmpl<int>;
---------------------- CUT HERE ----------------------

The "badbad" string is missing from the assembly, or it is replaced by
junk.

I include a patch below I've been using for more than a year now.  I'm
not a gcc developer, so this may not be the best way to fix this.  The
patch is small and could only affect inline asm code in C++ templates,
so it cannot cause any regressions.

This problem is not present in the 2.97 tree.  I do not know how it
was fixed there, maybe it just went away because of some general
rewrite.  If there was a specific fix for that in the 2.96 tree, that
could be backported.

Thanks,

Zoli

 *** gcc/cp/semantics.c.orig	Sat Jun 19 18:54:52 1999
 --- gcc/cp/semantics.c	Fri Nov 19 11:21:28 1999
 ***************
 *** 26,31 ****
 --- 26,32 ----
   
   #include "config.h"
   #include "system.h"
 + #include "obstack.h"
   #include "tree.h"
   #include "cp-tree.h"
   #include "except.h"
 ***************
 *** 712,717 ****
 --- 713,720 ----
     return r;
   }
   
 + extern struct obstack permanent_obstack;
 + 
   /* Finish an asm-statement, whose components are a CV_QUALIFIER, a
      STRING, some OUTPUT_OPERANDS, some INPUT_OPERANDS, and some
      CLOBBERS.  */
 ***************
 *** 725,732 ****
 	tree input_operands;
 	tree clobbers;
   {
 !   if (TREE_CHAIN (string))
       string = combine_strings (string);
   
     if (processing_template_decl)
       {
 --- 728,742 ----
 	tree input_operands;
 	tree clobbers;
   {
 !   if (TREE_CHAIN (string)) {
       string = combine_strings (string);
 +     if (processing_template_decl) {
 +       int l = TREE_STRING_LENGTH(string);
 +       char *s = (char *) obstack_alloc(&permanent_obstack, l);
 +       memcpy(s, TREE_STRING_POINTER(string), l);
 +       TREE_STRING_POINTER(string) = s;
 +     }
 +   }
   
     if (processing_template_decl)
       {

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