* [committed] libstdc++: Fix narrowing conversion in std/time/clock/utc/io.cc
@ 2023-01-15 12:45 Jonathan Wakely
0 siblings, 0 replies; only message in thread
From: Jonathan Wakely @ 2023-01-15 12:45 UTC (permalink / raw)
To: libstdc++, gcc-patches
Tested x86_64-linux, and verified with -fsigned-char -fshort-wchar
(which makes the underlying type of wchar_t be unsigned short).
Nightstrike also tested on mingw-w64.
Pushed to trunk.
-- >8 --
For a port with signed char and unsigned wchar_t initializing a wchar_t
array with a char is a narrowing conversion. The code is wrong for
assuming that (int)'a' == (int)L'a' anyway, so fix it properly by using
ctype<wchar_t>::widen(char).
libstdc++-v3/ChangeLog:
* testsuite/std/time/clock/utc/io.cc: Use ctype to widen char.
---
libstdc++-v3/testsuite/std/time/clock/utc/io.cc | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/testsuite/std/time/clock/utc/io.cc b/libstdc++-v3/testsuite/std/time/clock/utc/io.cc
index b327c7f50c7..933cba65f44 100644
--- a/libstdc++-v3/testsuite/std/time/clock/utc/io.cc
+++ b/libstdc++-v3/testsuite/std/time/clock/utc/io.cc
@@ -46,6 +46,7 @@ test_format()
std::ostringstream ss;
std::wostringstream wss;
+ const auto& ct = std::use_facet<std::ctype<wchar_t>>(wss.getloc());
for (char c : specs)
{
@@ -68,7 +69,7 @@ test_format()
"required by the chrono-specs") != s.npos);
}
- wchar_t wfmt[] = { L'{', L':', L'%', c, L'}' };
+ wchar_t wfmt[] = { L'{', L':', L'%', ct.widen(c), L'}' };
try
{
wss << std::vformat(std::wstring_view(wfmt, 5),
--
2.39.0
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