Re: [MacPorts] #70866: gcc14 doesn’t build for x86_64 on macOS 15 (Xcode 16): “Undefined symbols for architecture x86_64” while linking libgcc_s.1.dylib

[MacPorts]

#70866: gcc14 doesn’t build for x86_64 on macOS 15 (Xcode 16): “Undefined symbols
for architecture x86_64” while linking libgcc_s.1.dylib
---------------------------+-----------------------------------
  Reporter:  markmentovai  |      Owner:  markmentovai
      Type:  defect        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:  fixed         |   Keywords:  sonoma sequoia x86_64
      Port:  gcc14         |
---------------------------+-----------------------------------

Comment (by markmentovai):

 Replying to [comment:33 haberg-1]:
 > It installs now, but I get a linker warning when compiling a C++
 program:
 > ld: warning: -ld_classic is deprecated and will be removed in a future
 release

 This warning doesn’t come from gcc. It comes from Apple’s ld, as of Xcode
 16 (and the corresponding Command Line Tools version). MacPorts gcc
 requests this linker: [https://github.com/macports/macports-
 ports/blob/f3a3d36e576fcbf2a9ee970cf497741d349b0a16/lang/gcc14/Portfile#L229
 lang/gcc14/Portfile]. (`${prefix}/bin/ld-classic`
 [https://github.com/macports/macports-
 ports/blob/32bc043e582c33a4636fee958774739e7cb90e5b/devel/ld64/files/ld-
 classic-xcode is this wrapper] that finds and runs `ld -ld_classic`.)

 A new bug should be filed for this. It’s not related to this bug report,
 “Undefined symbols for architecture x86_64” while linking libgcc_s.1 from
 gcc14.

 It’s possible that MacPorts gcc no longer needs the `ld-classic`
 workaround as long as [https://github.com/gcc-
 mirror/gcc/commit/0fe7962afc7c01488432b98b6f442b24946a490d gcc
 0fe7962afc7c] is in effect. That change has been cherry-picked as far back
 as [https://github.com/gcc-
 mirror/gcc/commit/9488ad0d780fae91afa910410cb4e6da8d607fd9 gcc-11].

-- 
Ticket URL: <https://trac.macports.org/ticket/70866#comment:34>
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