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* [gcc r13-1139] libstdc++: Support constexpr global std::string for size < 15 [PR105995]
@ 2022-06-16 19:20 Jonathan Wakely
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From: Jonathan Wakely @ 2022-06-16 19:20 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:98a0d72a610a87e8e383d366e50253ddcc9a51dd
commit r13-1139-g98a0d72a610a87e8e383d366e50253ddcc9a51dd
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.
Diff:
---
libstdc++-v3/include/bits/basic_string.h | 3 ++-
.../testsuite/21_strings/basic_string/cons/char/105995.cc | 9 +++++++++
2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/include/bits/basic_string.h b/libstdc++-v3/include/bits/basic_string.h
index 57247e306dc..b04fba95678 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..aa8bcba3dca
--- /dev/null
+++ b/libstdc++-v3/testsuite/21_strings/basic_string/cons/char/105995.cc
@@ -0,0 +1,9 @@
+// { dg-options "-std=gnu++20" }
+// { dg-do compile { target c++20 } }
+// { dg-require-effective-target cxx11_abi }
+
+// 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";
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