[PATCH] c++: install cp-trait.def as part of plugin headers [PR107136]

[Patrick Palka <ppalka@redhat.com>]

This is apparently needed since we include cp-trait.def from cp-tree.h
(in order to define the cp_trait_kind enum), as with operators.def.

Tested on x86_64-pc-linux-gnu by doing make install and verifying
cp-trait.def appears in

  $prefix/lib/gcc/x86_64-pc-linux-gnu/13.0.0/plugin/include/cp/

Does this look OK for trunk?

	PR c++/107136

gcc/cp/ChangeLog:

	* Make-lang.in (CP_PLUGIN_HEADERS): Add cp-trait.def.
---
 gcc/cp/Make-lang.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/cp/Make-lang.in b/gcc/cp/Make-lang.in
index 38d8eeed1f0..aa84d6827be 100644
--- a/gcc/cp/Make-lang.in
+++ b/gcc/cp/Make-lang.in
@@ -39,7 +39,7 @@ CXX_INSTALL_NAME := $(shell echo c++|sed '$(program_transform_name)')
 GXX_INSTALL_NAME := $(shell echo g++|sed '$(program_transform_name)')
 CXX_TARGET_INSTALL_NAME := $(target_noncanonical)-$(shell echo c++|sed '$(program_transform_name)')
 GXX_TARGET_INSTALL_NAME := $(target_noncanonical)-$(shell echo g++|sed '$(program_transform_name)')
-CP_PLUGIN_HEADERS := cp-tree.h cxx-pretty-print.h name-lookup.h type-utils.h operators.def
+CP_PLUGIN_HEADERS := cp-tree.h cxx-pretty-print.h name-lookup.h type-utils.h operators.def cp-trait.def
 
 #\f
 # Define the names for selecting c++ in LANGUAGES.
-- 
2.38.0.rc2