[MacPorts] #61406: emacs @27.1_2+x11: dyld: lazy symbol binding failed: Symbol not found: _aligned_alloc (was: Emacs 27.1_2 +x11 fails to build with undefined symbol)

[MacPorts]

#61406: emacs @27.1_2+x11: dyld: lazy symbol binding failed: Symbol not found:
_aligned_alloc
--------------------------+----------------------
  Reporter:  texas-swift  |      Owner:  drkp
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.6.3
Resolution:               |   Keywords:
      Port:  emacs        |
--------------------------+----------------------
Changes (by ryandesign):

 * status:  new => assigned
 * keywords:  emacs +x11 =>
 * owner:  (none) => drkp
 * port:  emacs at 27.1_2+x11 => emacs


Old description:

> Hello,
>
> I have so far been unable to build any version of Emacs 27 +x11.  I keep
> getting this message during bootstrap build:
>
> :info:build ./temacs --batch  -l loadup --temacs=pbootstrap
> :info:build dyld: lazy symbol binding failed: Symbol not found:
> _aligned_alloc
> :info:build   Referenced from:
> /opt/local/var/macports/build/_opt_local_var_mac\
> ports_sources_rsync.macports.org_macports_release_tarballs_ports_editors_emacs/\
> emacs/work/emacs-27.1/src/./temacs
> :info:build   Expected in: /usr/lib/libSystem.B.dylib
>
> I can successfully build emacs 27.1_2 W/O x11, but I am a heavy X11 user
> and prefer that variant.
> I have also successfully built emacs 26+x11.
>
> macOS 10.14.6 Mojave
> Xcode 11.3.1

New description:

 Hello,

 I have so far been unable to build any version of Emacs 27 +x11.  I keep
 getting this message during bootstrap build:

 {{{
 :info:build ./temacs --batch  -l loadup --temacs=pbootstrap
 :info:build dyld: lazy symbol binding failed: Symbol not found:
 _aligned_alloc
 :info:build   Referenced from:
 /opt/local/var/macports/build/_opt_local_var_mac\
 ports_sources_rsync.macports.org_macports_release_tarballs_ports_editors_emacs/\
 emacs/work/emacs-27.1/src/./temacs
 :info:build   Expected in: /usr/lib/libSystem.B.dylib
 }}}

 I can successfully build emacs 27.1_2 W/O x11, but I am a heavy X11 user
 and prefer that variant.
 I have also successfully built emacs 26+x11.

 macOS 10.14.6 Mojave\\
 Xcode 11.3.1

--

Comment:

 There are several other reports of this problem by searching Google.

 Here is the upstream bug report, I think:
 https://debbugs.gnu.org/cgi/bugreport.cgi?bug=36172

 The problem occurs because Xcode 11 has the macOS 10.15 SDK. Aligned alloc
 was apparently introduced in 10.15 and the emacs configure script
 erroneously takes it presence in the SDK as an indication that it can be
 used at runtime on 10.14, which it cannot. The developers of emacs appear
 to be unaware of how macOS SDKs work.

 You could avoid the problem by downgrading to Xcode 10 and the Xcode 10
 version of the command line tools.

-- 
Ticket URL: <https://trac.macports.org/ticket/61406#comment:1>
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