Bug 282514

Summary: lang/v8: fix build with libc++ 19
Product: Ports & Packages Reporter: Dimitry Andric <dim>
Component: Individual Port(s)Assignee: Dimitry Andric <dim>
Status: Closed FIXED    
Severity: Affects Some People Flags: sunpoet: maintainer-feedback+
Priority: ---    
Version: Latest   
Hardware: Any   
OS: Any   
Bug Depends on:    
Bug Blocks: 280562    
Attachments:
Description Flags
lang/v8: fix build with libc++ 19 none

Description Dimitry Andric freebsd_committer freebsd_triage 2024-11-03 14:24:51 UTC
As noted in the libc++ 19 release notes [1], std::char_traits<> is now
only provided for char, char8_t, char16_t, char32_t and wchar_t, and any
instantiation for other types will fail.

This causes lang/v8 to fail to compile with clang 19 and libc++ 19,
resulting in errors similar to:

  /usr/include/c++/v1/string:820:42: error: implicit instantiation of undefined template 'std::char_traits<unsigned short>'
    820 |   static_assert(is_same<_CharT, typename traits_type::char_type>::value,
        |                                          ^
  ../../src/inspector/v8-string-conversions.cc:387:26: note: in instantiation of template class 'std::basic_string<unsigned short>' requested here
    387 | std::basic_string<UChar> UTF8ToUTF16(const char* stringStart, size_t length) {
        |                          ^
  /usr/include/c++/v1/__fwd/string.h:23:29: note: template is declared here
     23 | struct _LIBCPP_TEMPLATE_VIS char_traits;
        |                             ^

Upstream v8 has fixed this in commit 182d9c05e78 [2], so add it as a
backported patch, until the next version of v8 is released.

[1] https://libcxx.llvm.org/ReleaseNotes/19.html#deprecations-and-removals
[2] https://chromium.googlesource.com/v8/v8.git/+/182d9c05e78
Comment 1 Dimitry Andric freebsd_committer freebsd_triage 2024-11-03 14:25:37 UTC
Created attachment 254900 [details]
lang/v8: fix build with libc++ 19
Comment 2 Po-Chuan Hsieh freebsd_committer freebsd_triage 2024-11-15 10:50:54 UTC
LGTM. Thanks for the fix.
Comment 3 commit-hook freebsd_committer freebsd_triage 2024-11-15 12:59:46 UTC
A commit in branch main references this bug:

URL: https://cgit.FreeBSD.org/ports/commit/?id=1617a29594f0a2f73ca741638e97e591a6618365

commit 1617a29594f0a2f73ca741638e97e591a6618365
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2024-11-03 14:24:04 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2024-11-15 12:59:00 +0000

    lang/v8: fix build with libc++ 19

    As noted in the libc++ 19 release notes [1], std::char_traits<> is now
    only provided for char, char8_t, char16_t, char32_t and wchar_t, and any
    instantiation for other types will fail.

    This causes lang/v8 to fail to compile with clang 19 and libc++ 19,
    resulting in errors similar to:

      /usr/include/c++/v1/string:820:42: error: implicit instantiation of undefined template 'std::char_traits<unsigned short>'
        820 |   static_assert(is_same<_CharT, typename traits_type::char_type>::value,
            |                                          ^
      ../../src/inspector/v8-string-conversions.cc:387:26: note: in instantiation of template class 'std::basic_string<unsigned short>' requested here
        387 | std::basic_string<UChar> UTF8ToUTF16(const char* stringStart, size_t length) {
            |                          ^
      /usr/include/c++/v1/__fwd/string.h:23:29: note: template is declared here
         23 | struct _LIBCPP_TEMPLATE_VIS char_traits;
            |                             ^

    Upstream v8 has fixed this in commit 182d9c05e78 [2], so add it as a
    backported patch, until the next version of v8 is released.

    [1] https://libcxx.llvm.org/ReleaseNotes/19.html#deprecations-and-removals
    [2] https://chromium.googlesource.com/v8/v8.git/+/182d9c05e78

    PR:             282514
    Approved by:    sunpoet (maintainer)
    MFH:            2024Q4

 lang/v8/files/patch-182d9c05e78 (new) | 180 ++++++++++++++++++++++++++++++++++
 1 file changed, 180 insertions(+)
Comment 4 commit-hook freebsd_committer freebsd_triage 2024-11-15 13:01:49 UTC
A commit in branch 2024Q4 references this bug:

URL: https://cgit.FreeBSD.org/ports/commit/?id=c218e1c04054af8e5406f4b4844d0697969e74ef

commit c218e1c04054af8e5406f4b4844d0697969e74ef
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2024-11-03 14:24:04 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2024-11-15 13:00:54 +0000

    lang/v8: fix build with libc++ 19

    As noted in the libc++ 19 release notes [1], std::char_traits<> is now
    only provided for char, char8_t, char16_t, char32_t and wchar_t, and any
    instantiation for other types will fail.

    This causes lang/v8 to fail to compile with clang 19 and libc++ 19,
    resulting in errors similar to:

      /usr/include/c++/v1/string:820:42: error: implicit instantiation of undefined template 'std::char_traits<unsigned short>'
        820 |   static_assert(is_same<_CharT, typename traits_type::char_type>::value,
            |                                          ^
      ../../src/inspector/v8-string-conversions.cc:387:26: note: in instantiation of template class 'std::basic_string<unsigned short>' requested here
        387 | std::basic_string<UChar> UTF8ToUTF16(const char* stringStart, size_t length) {
            |                          ^
      /usr/include/c++/v1/__fwd/string.h:23:29: note: template is declared here
         23 | struct _LIBCPP_TEMPLATE_VIS char_traits;
            |                             ^

    Upstream v8 has fixed this in commit 182d9c05e78 [2], so add it as a
    backported patch, until the next version of v8 is released.

    [1] https://libcxx.llvm.org/ReleaseNotes/19.html#deprecations-and-removals
    [2] https://chromium.googlesource.com/v8/v8.git/+/182d9c05e78

    PR:             282514
    Approved by:    sunpoet (maintainer)
    MFH:            2024Q4

    (cherry picked from commit 1617a29594f0a2f73ca741638e97e591a6618365)

 lang/v8/files/patch-182d9c05e78 (new) | 180 ++++++++++++++++++++++++++++++++++
 1 file changed, 180 insertions(+)