Compilation fails with gcc 14+

[BtbN]

15.95 /50-libzmq/src/ip.cpp: In function 'int zmq::make_fdpair(fd_t*, fd_t*)':
15.95 /50-libzmq/src/ip.cpp:678:1: error: jump to label 'try_tcpip'
15.95   678 | try_tcpip:
15.95       | ^~~~~~~~~
15.95 /50-libzmq/src/ip.cpp:568:14: note:   from here
15.95   568 |         goto try_tcpip;
15.95       |              ^~~~~~~~~
15.95 /50-libzmq/src/ip.cpp:572:18: note:   crosses initialization of 'const SOCKET listener'
15.95   572 |     const SOCKET listener = open_socket (AF_UNIX, SOCK_STREAM, 0);
15.95       |      

This is an issue since #4734 was merged.
The variable needs to be zero-initialized before the goto at the very least.

[jaapiyo]

I have the same issue, compiling for x64 on Windows.

[build] FAILED: _deps/libzmq-build/CMakeFiles/libzmq-static.dir/src/ip.cpp.obj 
[build] C:\PROGRA~1\MIB055~1\2022\COMMUN~1\VC\Tools\MSVC\1441~1.341\bin\Hostx64\x64\cl.exe  /nologo /TP -DFD_SETSIZE=16384 -DZMQ_CUSTOM_PLATFORM_HPP -DZMQ_STATIC -D_CRT_SECURE_NO_WARNINGS -D_REENTRANT -D_THREAD_SAFE -D_WIN32_WINNT=0x0A00 -D_WINSOCK_DEPRECATED_NO_WARNINGS -IC:\dev\ExtDataViewer\ExtDataViewer\out\build\x64-debug\_deps\libzmq-src\include -IC:\dev\ExtDataViewer\ExtDataViewer\out\build\x64-debug\_deps\libzmq-build -DZMQ_STATIC /EHsc /W3 /MP /MDd /Ob0 /Od /RTC1 -std:c++20 -ZI /DZMQ_STATIC /Yuprecompiled.hpp /showIncludes /Fo_deps\libzmq-build\CMakeFiles\libzmq-static.dir\src\ip.cpp.obj /Fd_deps\libzmq-build\CMakeFiles\libzmq-static.dir\libzmq-static.pdb /FS -c C:\dev\ExtDataViewer\ExtDataViewer\out\build\x64-debug\_deps\libzmq-src\src\ip.cpp
[build] C:\dev\ExtDataViewer\ExtDataViewer\out\build\x64-debug\_deps\libzmq-src\src\ip.cpp(572): error C2362: initialization of 'listener' is skipped by 'goto try_tcpip'
[build] C:\dev\ExtDataViewer\ExtDataViewer\out\build\x64-debug\_deps\libzmq-src\src\ip.cpp(678): note: see declaration of 'try_tcpip'

My solution was to stick to the latest stable release in my CMake configuration.

FetchContent_Declare(libzmq 
	GIT_REPOSITORY https://github.com/zeromq/libzmq
	GIT_TAG        622fc6dde99ee172ebaa9c8628d85a7a1995a21d # release-4.3.5
) 

FetchContent_MakeAvailable(libzmq)

[BtbN]

Fixed in #4757