[MacPorts] #58776: macOS 10.15 libgcc9 fails to build with Xcode 11

[MacPorts]

#58776: macOS 10.15 libgcc9 fails to build with Xcode 11
-----------------------+----------------------
  Reporter:  vdoublie  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  catalina
      Port:  libgcc9   |
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Comment (by saagarjha):

 It seems like cc1 is dying inside of llibgmp.10.dylib`__gmpn_copyi:


 {{{
 * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
 (code=1, address=0x7ffeefc00010)
     frame #0: 0x00000001441444aa libgmp.10.dylib`__gmpn_copyi + 234
 libgmp.10.dylib`__gmpn_copyi:
 ->  0x1441444aa <+234>: movdqa xmmword ptr [rdi + 0x70], xmm7
     0x1441444af <+239>: palignr xmm6, xmm5, 0x8           ; xmm6 =
 xmm5[8,9,10,11,12,13,14,15],xmm6[0,1,2,3,4,5,6,7]
     0x1441444b5 <+245>: movaps xmm7, xmmword ptr [rsi + 0x78]
     0x1441444b9 <+249>: movdqa xmmword ptr [rdi + 0x60], xmm6
 Target 0: (cc1) stopped.
 }}}

 This is might be related to the stack alignment issues that Xcode 11 has
 (https://lists.macports.org/pipermail/macports-
 dev/2019-October/041324.html)? I'll try building with -fno-stack-check to
 see if it helps.

-- 
Ticket URL: <https://trac.macports.org/ticket/58776#comment:18>
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