git: a3a88aa13260 - main - Fix buildworld with gcc 13 after llvm-19 import

The branch main has been updated by dim:

URL: https://cgit.FreeBSD.org/src/commit/?id=a3a88aa132605c5d42153a419c0e129296dec467

commit a3a88aa132605c5d42153a419c0e129296dec467
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2024-10-24 21:42:36 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2024-10-24 22:09:33 +0000

    Fix buildworld with gcc 13 after llvm-19 import
    
    It turns out the new libc++ 19 headers result in a -Werror warning from
    gcc 13:
    
      In file included from /usr/obj/usr/src/freebsd/src/amd64.amd64/tmp/usr/include/c++/v1/__memory/shared_ptr.h:31:
      /usr/obj/usr/src/freebsd/src/amd64.amd64/tmp/usr/include/c++/v1/__memory/uninitialized_algorithms.h: In instantiation of 'constexpr void std::__1::__uninitialized_allocator_relocate(_Alloc&, _Tp*, _Tp*, _Tp*) [with _Alloc = allocator<basic_string<char> >; _Tp = basic_string<char>]':
      /usr/obj/usr/src/freebsd/src/amd64.amd64/tmp/usr/include/c++/v1/vector:1052:42:   required from 'void std::__1::vector<_Tp, _Alloc>::__swap_out_circular_buffer(std::__1::__split_buffer<_Tp, _Allocator&>&) [with _Tp = std::__1::basic_string<char>; _Allocator = std::__1::allocator<std::__1::basic_string<char> >]'
      /usr/obj/usr/src/freebsd/src/amd64.amd64/tmp/usr/include/c++/v1/vector:1469:31:   required from 'void std::__1::vector<_Tp, _Alloc>::reserve(size_type) [with _Tp = std::__1::basic_string<char>; _Allocator = std::__1::allocator<std::__1::basic_string<char> >; size_type = long unsigned int]'
      /usr/src/freebsd/src/contrib/googletest/googletest/src/gtest.cc:795:27:   required from here
      /usr/obj/usr/src/freebsd/src/amd64.amd64/tmp/usr/include/c++/v1/__memory/uninitialized_algorithms.h:645:21: error: 'void* __builtin_memcpy(void*, const void*, long unsigned int)' writing to an object of type 'std::__1::__remove_const_t<std::__1::basic_string<char> >' {aka 'class std::__1::basic_string<char>'} with no trivial copy-assignment; use copy-assignment or copy-initialization instead o[-Werror=class-memaccess]
        645 |     __builtin_memcpy(const_cast<__remove_const_t<_Tp>*>(__result), __first, sizeof(_Tp) * (__last - __first));
            |     ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      In file included from /usr/obj/usr/src/freebsd/src/amd64.amd64/tmp/usr/include/c++/v1/__system_error/error_category.h:15,
                       from /usr/obj/usr/src/freebsd/src/amd64.amd64/tmp/usr/include/c++/v1/__system_error/error_code.h:18,
                       from /usr/obj/usr/src/freebsd/src/amd64.amd64/tmp/usr/include/c++/v1/__ostream/basic_ostream.h:16:
      /usr/obj/usr/src/freebsd/src/amd64.amd64/tmp/usr/include/c++/v1/string:752:7: note: 'std::__1::__remove_const_t<std::__1::basic_string<char> >' {aka 'class std::__1::basic_string<char>'} declared here
        752 | class basic_string {
            |       ^~~~~~~~~~~~
    
    Since this is all benign, turn off errors for -Wclass-memaccess.
    
    PR:             280562
    MFC after:      3 days
---
 share/mk/bsd.sys.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/share/mk/bsd.sys.mk b/share/mk/bsd.sys.mk
index 1934a79a5427..63774e857167 100644
--- a/share/mk/bsd.sys.mk
+++ b/share/mk/bsd.sys.mk
@@ -221,6 +221,7 @@ CWARNFLAGS+=	-Wno-error=aggressive-loop-optimizations	\
 		-Wno-error=restrict				\
 		-Wno-error=sizeof-pointer-memaccess		\
 		-Wno-error=stringop-truncation
+CXXWARNFLAGS+=	-Wno-error=class-memaccess
 .endif
 
 # GCC 9.2.0