public inbox for libstdc++-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc r12-8657] libstdc++: Support constexpr global std::string for size < 15 [PR105995]
@ 2022-08-03 13:47 Jonathan Wakely
0 siblings, 0 replies; only message in thread
From: Jonathan Wakely @ 2022-08-03 13:47 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:e562236851e06091256593aa0d3fbda60a28e45b
commit r12-8657-ge562236851e06091256593aa0d3fbda60a28e45b
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Thu Jun 16 14:57:32 2022 +0100
libstdc++: Support constexpr global std::string for size < 15 [PR105995]
I don't think this is required by the standard, but it's easy to
support.
libstdc++-v3/ChangeLog:
PR libstdc++/105995
* include/bits/basic_string.h (_M_use_local_data): Initialize
the entire SSO buffer.
* testsuite/21_strings/basic_string/cons/char/105995.cc: New test.
(cherry picked from commit 98a0d72a610a87e8e383d366e50253ddcc9a51dd)
Diff:
---
libstdc++-v3/include/bits/basic_string.h | 3 ++-
.../testsuite/21_strings/basic_string/cons/char/105995.cc | 11 +++++++++++
2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/include/bits/basic_string.h b/libstdc++-v3/include/bits/basic_string.h
index 6041d05815b..9777deaf2e9 100644
--- a/libstdc++-v3/include/bits/basic_string.h
+++ b/libstdc++-v3/include/bits/basic_string.h
@@ -352,7 +352,8 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
{
#if __cpp_lib_is_constant_evaluated
if (std::is_constant_evaluated())
- _M_local_buf[0] = _CharT();
+ for (_CharT& __c : _M_local_buf)
+ __c = _CharT();
#endif
return _M_local_data();
}
diff --git a/libstdc++-v3/testsuite/21_strings/basic_string/cons/char/105995.cc b/libstdc++-v3/testsuite/21_strings/basic_string/cons/char/105995.cc
new file mode 100644
index 00000000000..4764ceff72a
--- /dev/null
+++ b/libstdc++-v3/testsuite/21_strings/basic_string/cons/char/105995.cc
@@ -0,0 +1,11 @@
+// { dg-options "-std=gnu++20" }
+// { dg-do compile { target c++20 } }
+// { dg-require-effective-target cxx11_abi }
+
+#include <string>
+
+// PR libstdc++/105995
+// Not required by the standard, but supported for QoI.
+constexpr std::string pr105995_empty;
+constexpr std::string pr105995_partial = "0";
+constexpr std::string pr105995_full = "0123456789abcde";
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2022-08-03 13:47 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-08-03 13:47 [gcc r12-8657] libstdc++: Support constexpr global std::string for size < 15 [PR105995] Jonathan Wakely
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).