* [committed] libstdc++: Support constexpr global std::string for size < 15 [PR105995]
@ 2022-06-16 19:21 Jonathan Wakely
2022-06-17 12:32 ` Jonathan Wakely
0 siblings, 1 reply; 2+ messages in thread
From: Jonathan Wakely @ 2022-06-16 19:21 UTC (permalink / raw)
To: libstdc++, gcc-patches
Tested x86_64-linux, pushed to trunk.
-- >8 --
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.
---
libstdc++-v3/include/bits/basic_string.h | 3 ++-
.../21_strings/basic_string/cons/char/105995.cc | 9 +++++++++
2 files changed, 11 insertions(+), 1 deletion(-)
create mode 100644 libstdc++-v3/testsuite/21_strings/basic_string/cons/char/105995.cc
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";
--
2.34.3
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [committed] libstdc++: Support constexpr global std::string for size < 15 [PR105995]
2022-06-16 19:21 [committed] libstdc++: Support constexpr global std::string for size < 15 [PR105995] Jonathan Wakely
@ 2022-06-17 12:32 ` Jonathan Wakely
0 siblings, 0 replies; 2+ messages in thread
From: Jonathan Wakely @ 2022-06-17 12:32 UTC (permalink / raw)
To: Jonathan Wakely; +Cc: libstdc++, gcc Patches
[-- Attachment #1: Type: text/plain, Size: 566 bytes --]
On Thu, 16 Jun 2022 at 20:23, Jonathan Wakely via Libstdc++
<libstdc++@gcc.gnu.org> wrote:
>
> Tested x86_64-linux, pushed to trunk.
Somehow I messed up the test in the commit I pushed (but not the one I
tested ... weird).
Fixed at r13-1151-g0f96ac43fa0a5f by the attached patch.
-- >8 --
libstdc++: Add missing #include <string> to new test
Somehow I pushed a different version of this test to the one I actually
tested.
libstdc++-v3/ChangeLog:
* testsuite/21_strings/basic_string/cons/char/105995.cc: Add
missing #include.
[-- Attachment #2: patch.txt --]
[-- Type: text/plain, Size: 996 bytes --]
commit 0f96ac43fa0a5fdbfce317b274233852d5b46d23
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Fri Jun 17 13:29:05 2022
libstdc++: Add missing #include <string> to new test
Somehow I pushed a different version of this test to the one I actually
tested.
libstdc++-v3/ChangeLog:
* testsuite/21_strings/basic_string/cons/char/105995.cc: Add
missing #include.
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
index aa8bcba3dca..4764ceff72a 100644
--- a/libstdc++-v3/testsuite/21_strings/basic_string/cons/char/105995.cc
+++ b/libstdc++-v3/testsuite/21_strings/basic_string/cons/char/105995.cc
@@ -2,6 +2,8 @@
// { 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;
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