NetBSD Problem Report #60241

From www@netbsd.org  Fri May  8 13:36:01 2026
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Date: Fri,  8 May 2026 13:36:00 +0000 (UTC)
From: opensauce04@gmail.com
Reply-To: opensauce04@gmail.com
To: gnats-bugs@NetBSD.org
Subject: qt6-qtbase: Build fails on macOS with error "implicitly declaring library function '__yield' with type 'void ()'"
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X-From4GNATS: "opensauce04@gmail.com via gnats" <gnats-admin@NetBSD.org>

>Number:         60241
>Category:       pkg
>Synopsis:       qt6-qtbase: Build fails on macOS with error "implicitly declaring library function '__yield' with type 'void ()'"
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri May 08 13:40:00 +0000 2026
>Last-Modified:  Sat May 09 15:10:01 +0000 2026
>Originator:     Daniel Bradbury
>Release:        pkgsrc 2026Q1
>Organization:
>Environment:
Darwin danmbp 25.4.0 Darwin Kernel Version 25.4.0: Thu Mar 19 19:33:43 PDT 2026; root:xnu-12377.101.15~1/RELEASE_ARM64_T8142 arm64
>Description:
When attempting to build the qt6-qtbase package on macOS, the build process fails very shortly after it starts with several build failures like this, all with the same error message:

```
In file included from /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/src/corelib/global/qalloc.cpp:6:
In file included from /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/include/QtCore/qalgorithms.h:1:
In file included from /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/src/corelib/tools/qalgorithms.h:11:
In file included from /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/include/QtCore/qglobal.h:1:
In file included from /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/src/corelib/global/qglobal.h:51:
In file included from /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/include/QtCore/qatomic.h:1:
In file included from /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/src/corelib/thread/qatomic.h:9:
In file included from /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/include/QtCore/qbasicatomic.h:1:
In file included from /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/src/corelib/thread/qbasicatomic.h:9:
In file included from /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/include/QtCore/qatomic_cxx11.h:1:
In file included from /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/src/corelib/thread/qatomic_cxx11.h:10:
In file included from /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/include/QtCore/qyieldcpu.h:1:
/opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/src/corelib/thread/qyieldcpu.h:37:5: error: implicitly declaring library function '__yield' with type 'void ()'
      [-Werror,-Wimplicit-function-declaration]
   37 |     __yield();              // Generic
      |     ^
```
>How-To-Repeat:
Attempt to build the `qt6-qtbase` package on macOS on the pkgsrc 2026Q1 branch.
>Fix:

>Audit-Trail:
From: Tobias Nygren <tnn@NetBSD.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: pkg/60241: qt6-qtbase: Build fails on macOS with error
 "implicitly declaring library function '__yield' with type 'void ()'"
Date: Fri, 8 May 2026 15:44:51 +0200

 On Fri,  8 May 2026 13:40:00 +0000 (UTC)
 "opensauce04@gmail.com via gnats" <gnats-admin@NetBSD.org> wrote:

 > /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/src/corelib/thread/qyieldcpu.h:37:5: error: implicitly declaring library function '__yield' with type 'void ()'
 >       [-Werror,-Wimplicit-function-declaration]
 >    37 |     __yield();              // Generic

 This is related to xcode 26.4 which I believe released after 2026Q1.
 It should be fixed in pkgsrc-current with this commit:

 https://mail-index.netbsd.org/pkgsrc-changes/2026/03/27/msg342910.html

From: opensauce04@gmail.com
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: pkg/60241: qt6-qtbase: Build fails on macOS with error
 "implicitly declaring library function '__yield' with type 'void ()'"
Date: Sat, 9 May 2026 16:09:16 +0100

 >   > /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/src/corelib/thread/qyieldcpu.h:37:5: error: implicitly declaring library function '__yield' with type 'void ()'
 >   >       [-Werror,-Wimplicit-function-declaration]
 >   >    37 |     __yield();              // Generic
 >   
 >   This is related to xcode 26.4 which I believe released after 2026Q1.
 >   It should be fixed in pkgsrc-current with this commit:
 >   
 >   https://mail-index.netbsd.org/pkgsrc-changes/2026/03/27/msg342910.html

 Kind of?

 The specific build issue that I brought up in the PR description is now 
 gone, but it is replaced with a different issue. About 1/3 of the way 
 through the build, it fails with this error message:

 ```
 dyld[56301]: Library not loaded: @rpath/libQt6Core.6.dylib
    Referenced from: <36F71CBD-69D0-3839-862C-912FBED36F8F> 
 /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/libexec/rcc
    Reason: tried: '/opt/pkg/lib/libQt6Core.6.dylib' (no such file), 
 '/System/Volumes/Preboot/Cryptexes/OS/opt/pkg/lib/libQt6Core.6.dylib' 
 (no such file), '/opt/pkg/lib/libQt6Core.6.dylib' (no such file), 
 '/System/Volumes/Preboot/Cryptexes/OS/opt/pkg/lib/libQt6Core.6.dylib' 
 (no such file)
 /bin/sh: line 1: 56301 Abort trap: 6  ../../../libexec/rcc --output 
 /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/src/assets/icons/.qt/rcc/qrc_example_icons.cpp 
 --name example_icons 
 /opt/pkgsrc/x11/qt6-qtbase/work/qtbase-everywhere-src-6.10.2/src/assets/icons/.qt/rcc/example_icons.qrc
 gmake[2]: *** 
 [src/assets/icons/CMakeFiles/ExampleIconsPrivate.dir/build.make:235: 
 src/assets/icons/.qt/rcc/qrc_example_icons.cpp] Error 134
 gmake[1]: *** [CMakeFiles/Makefile2:10657: 
 src/assets/icons/CMakeFiles/ExampleIconsPrivate.dir/all] Error 2
 ```

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