* [committed] libstdc++: Remove bogus assertion in std::from_chars [PR105324]
@ 2022-04-21 10:35 Jonathan Wakely
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From: Jonathan Wakely @ 2022-04-21 10:35 UTC (permalink / raw)
To: libstdc++, gcc-patches
Tested x86_64-linux, pushed to trunk. Backport to gcc-11 to follow.
-- >8 --
I'm not sure what I was thinking when I added this assertion, maybe it
was supposed to be alignment == 1 (which is what the pmr::string actually
uses). The simplest fix is to just remove the assertion.
The assertion is no longer enabled by default on trunk, but it's still
there for the --enablke-libstdcxx-debug build, and is still wrong. The
fix is needed on the gcc-11 branch.
libstdc++-v3/ChangeLog:
PR libstdc++/105324
* src/c++17/floating_from_chars.cc (buffer_resource::do_allocate):
Remove assertion.
* testsuite/20_util/from_chars/pr105324.cc: New test.
---
libstdc++-v3/src/c++17/floating_from_chars.cc | 1 -
.../testsuite/20_util/from_chars/pr105324.cc | 14 ++++++++++++++
2 files changed, 14 insertions(+), 1 deletion(-)
create mode 100644 libstdc++-v3/testsuite/20_util/from_chars/pr105324.cc
diff --git a/libstdc++-v3/src/c++17/floating_from_chars.cc b/libstdc++-v3/src/c++17/floating_from_chars.cc
index bbe03f7f068..0f5183aa9b5 100644
--- a/libstdc++-v3/src/c++17/floating_from_chars.cc
+++ b/libstdc++-v3/src/c++17/floating_from_chars.cc
@@ -101,7 +101,6 @@ namespace
return m_buf + std::__exchange(m_bytes, m_bytes + bytes);
__glibcxx_assert(m_ptr == nullptr);
- __glibcxx_assert(alignment != 1);
m_ptr = operator new(bytes);
m_bytes = bytes;
diff --git a/libstdc++-v3/testsuite/20_util/from_chars/pr105324.cc b/libstdc++-v3/testsuite/20_util/from_chars/pr105324.cc
new file mode 100644
index 00000000000..cecb17e41cc
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/from_chars/pr105324.cc
@@ -0,0 +1,14 @@
+// { dg-do run { target c++17 } }
+
+#include <charconv>
+#include <string>
+
+int main()
+{
+ // PR libstdc++/105324
+ // std::from_chars() assertion at floating_from_chars.cc:78
+ std::string s(512, '1');
+ s[1] = '.';
+ long double d;
+ std::from_chars(s.data(), s.data() + s.size(), d);
+}
--
2.34.1
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2022-04-21 10:35 [committed] libstdc++: Remove bogus assertion in std::from_chars [PR105324] Jonathan Wakely
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