From: Jonathan Wakely <jwakely@redhat.com>
Date: Thu, 1 Feb 2024 18:37:34 +0000 (+0000)
Subject: libstdc++: Force-inline shared_ptr::operator bool() for C++20 [PR108636]
X-Git-Tag: releases/gcc-12.4.0~439
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4b36925576d1097b20cddd29cf96c5b9ecfffc3d;p=thirdparty%2Fgcc.git

libstdc++: Force-inline shared_ptr::operator bool() for C++20 [PR108636]

This avoids a linker error with -fkeep-inline-functions when including
<filesystem>. We can't backport the fix from trunk because it adds an
export to the shared library. By marking the "missing" symbol
always_inline for C++20 mode we don't need a definition in the library.

libstdc++-v3/ChangeLog:

	PR libstdc++/108636
	* include/bits/shared_ptr_base.h (__shared_ptr::operator bool):
	Add always_inline attribute for C++20 and later.
---

diff --git a/libstdc++-v3/include/bits/shared_ptr_base.h b/libstdc++-v3/include/bits/shared_ptr_base.h
index c22b397a1946..23c3b17d46f9 100644
--- a/libstdc++-v3/include/bits/shared_ptr_base.h
+++ b/libstdc++-v3/include/bits/shared_ptr_base.h
@@ -1666,6 +1666,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       { return _M_ptr; }
 
       /// Return true if the stored pointer is not null.
+#if __cplusplus >= 202002L
+      [[__gnu__::__always_inline__]]
+#endif
       explicit operator bool() const noexcept
       { return _M_ptr != nullptr; }