Hello,
This is a possible fix for Wnarrowing warning issues.
Bootstrapped on x86_64 Linux.
diff --git a/gcc/cp/typeck2.cc b/gcc/cp/typeck2.cc
2 │ index 45edd180173..535f1bdfa3e 100644
3 │ --- a/gcc/cp/typeck2.cc
4 │ +++ b/gcc/cp/typeck2.cc
5 │ @@ -1142,6 +1142,10 @@ check_narrowing (tree type, tree init,
tsubst_flags_t complain
│ ,
6 │ return ok;
7 │ }
8 │
9 │ +/*pederror (loc, OPT_Wnarrowing,
10 │ + "narrowing conversion of constant expression from %qT to
%qT "
11 │ + "inside { }", ftype, ftype);
12 │ +*/
13 │ /* True iff TYPE is a C++20 "ordinary" character type. */
14 │
15 │ bool
16 │ diff --git a/gcc/diagnostic.cc b/gcc/diagnostic.cc
17 │ index 07c76b6c652..457da185821 100644
18 │ --- a/gcc/diagnostic.cc
19 │ +++ b/gcc/diagnostic.cc
20 │ @@ -112,6 +112,23 @@ get_terminal_width (void)
21 │ return INT_MAX;
22 │ }
23 │
24 │ +extern diagnostic_t pederror (location_t, int, const char *, )
25 │ + ATTRIBUTE_GCC_DIAG(3, 4);
26 │ +
27 │ +diagnostic_t
28 │ +pederror (location_t loc, int opt, const char *gmsgid)
29 │ +{
30 │ + va_list args;
31 │ + va_start (args, gmsgid);
32 │ + diagnostic_t result = diagnostic_report (loc, opt, gmsid,
args);
33 │ + va_end (args);
34 │ + if (result == DK_WARNING)
35 │ + {
36 │ + if (flag_pedantic_errors)
37 │ + return diagnostic_report (loc, opt, gmsgid, args);
38 │ + }
39 │ + return result;
40 │ +}
41 │ /* Set caret_max_width to value. */
42 │ void
43 │ diagnostic_set_caret_max_width (diagnostic_context *context, int
value)
