From: Nathan Blackburn <nathan.blackburn@arm.com>
Date: Wed, 22 Jul 2026 16:48:38 +0000 (+0000)
Subject: libstdc++: Remove noexcept from basic_string instantiations [PR126327]
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;ds=inline;p=thirdparty%2Fgcc.git

libstdc++: Remove noexcept from basic_string instantiations [PR126327]

The explicit instantiations of basic_string's default constructor used
an unconditional noexcept specification. For the fully-dynamic COW
string, those default constructors are noexcept(false).

Remove noexcept from both the char and wchar_t instantiations.

libstdc++-v3/ChangeLog:

	PR libstdc++/126327
	* src/c++20/string-inst.cc (basic_string::basic_string): Remove
	noexcept.
---

diff --git a/libstdc++-v3/src/c++20/string-inst.cc b/libstdc++-v3/src/c++20/string-inst.cc
index 2bdd77c78a4..b6b8d295b7c 100644
--- a/libstdc++-v3/src/c++20/string-inst.cc
+++ b/libstdc++-v3/src/c++20/string-inst.cc
@@ -37,7 +37,7 @@
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
-template basic_string<char>::basic_string() noexcept;
+template basic_string<char>::basic_string();
 template bool basic_string<char>::starts_with(string_view) const noexcept;
 template bool basic_string<char>::starts_with(char) const noexcept;
 template bool basic_string<char>::starts_with(const char*) const noexcept;
@@ -46,7 +46,7 @@ template bool basic_string<char>::ends_with(char) const noexcept;
 template bool basic_string<char>::ends_with(const char*) const noexcept;
 
 #ifdef _GLIBCXX_USE_WCHAR_T
-template basic_string<wchar_t>::basic_string() noexcept;
+template basic_string<wchar_t>::basic_string();
 template bool basic_string<wchar_t>::starts_with(wstring_view) const noexcept;
 template bool basic_string<wchar_t>::starts_with(wchar_t) const noexcept;
 template bool basic_string<wchar_t>::starts_with(const wchar_t*) const noexcept;