c-family, c++: Handle EXCESS_PRECISION_EXPR in pretty printers [PR112724]

I've noticed that the c-c++-common/gomp/depobj-3.c test FAILs on i686-linux:
PASS: c-c++-common/gomp/depobj-3.c  -std=c++17  at line 17 (test for warnings, line 15)
FAIL: c-c++-common/gomp/depobj-3.c  -std=c++17  at line 39 (test for warnings, line 37)
PASS: c-c++-common/gomp/depobj-3.c  -std=c++17  at line 43 (test for errors, line 41)
PASS: c-c++-common/gomp/depobj-3.c  -std=c++17  (test for warnings, line 45)
FAIL: c-c++-common/gomp/depobj-3.c  -std=c++17 (test for excess errors)
Excess errors:
/home/jakub/src/gcc/gcc/testsuite/c-c++-common/gomp/depobj-3.c:37:38: warning: the 'destroy' expression ''excess_precision_expr' not supported by dump_expr<expression error>' should
+be the same as the 'depobj' argument 'obj' [-Wopenmp]
The following patch replaces that 'excess_precision_expr' not supported by dump_expr<expression error>
with (float)(((long double)a) + (long double)5)
Still ugly and doesn't actually fix the FAIL (will deal with that
incrementally), but at least valid C/C++ and shows the excess precision
handling in action.

2024-03-26  Jakub Jelinek  <jakub@redhat.com>

	PR c++/112724
gcc/c-family/
	* c-pretty-print.cc (pp_c_cast_expression,
	c_pretty_printer::expression): Handle EXCESS_PRECISION_EXPR like
	NOP_EXPR.
gcc/cp/
	* error.cc (dump_expr): Handle EXCESS_PRECISION_EXPR like NOP_EXPR.

1 files changed, 1 insertions, 0 deletions

diff --git a/gcc/cp/error.cc b/gcc/cp/error.cc
index d3fcac7..7074845 100644
--- a/gcc/cp/error.cc
+++ b/gcc/cp/error.cc
@@ -2662,6 +2662,7 @@ dump_expr (cxx_pretty_printer *pp, tree t, int flags)
     CASE_CONVERT:
     case IMPLICIT_CONV_EXPR:
     case VIEW_CONVERT_EXPR:
+    case EXCESS_PRECISION_EXPR:
       {
 	tree op = TREE_OPERAND (t, 0);