[committed v2][GCC 11] ranger: Fix `-Werror' build error with `ranger_cache::push_poor_value'

Maciej W. Rozycki macro@embecosm.com
Wed Nov 3 22:10:29 GMT 2021

Remove a commit 86534c07a390 ("Disable poor value processing in ranger 
cache.") regression that caused GCC not to build anymore if `-Werror' 
has been enabled:

.../gcc/gimple-range-cache.cc: In member function 'bool ranger_cache::push_poor_value(basic_block, tree)':
.../gcc/gimple-range-cache.cc:850:44: error: unused parameter 'bb' [-Werror=unused-parameter]
  850 | ranger_cache::push_poor_value (basic_block bb, tree name)
      |                                ~~~~~~~~~~~~^~
.../gcc/gimple-range-cache.cc:850:53: error: unused parameter 'name' [-Werror=unused-parameter]
  850 | ranger_cache::push_poor_value (basic_block bb, tree name)
      |                                                ~~~~~^~~~

To keep the change to the minimum mark the parameters reported unused.

	* gimple-range-cache.cc (ranger_cache::push_poor_value): Mark 
	parameters unused.
On Wed, 3 Nov 2021, Jeff Law wrote:

> If possible, just drop the argument's name.  That's the C++ way to deal with
> an unused parameter.   Consider that pre-approved.  If that doesn't work, then
> adding the ATTRIBUTE_UNUSED is then approved.

 Umm, my 1990s dated proper C++ experience is surely rusty, disused and 
likely outdated.  Thanks for the hint.

 Applied as shown then.  Thanks for your review.

 gcc/gimple-range-cache.cc |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: gcc/gcc/gimple-range-cache.cc
--- gcc.orig/gcc/gimple-range-cache.cc
+++ gcc/gcc/gimple-range-cache.cc
@@ -847,7 +847,7 @@ ranger_cache::register_dependency (tree
 // the request is actually made (ie, isn't a duplicate).
-ranger_cache::push_poor_value (basic_block bb, tree name)
+ranger_cache::push_poor_value (basic_block, tree)
   // Disable poor value processing for GCC 11.  It has been disabled in GCC 12
   // as adding too much churn/compile time for too little benefit.

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