[MacPorts] #72205: Cannot build 7zip

[MacPorts]

#72205: Cannot build 7zip
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  Reporter:  stevehav  |      Owner:  srirangav
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  7zip      |
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Comment (by aeiouaeiouaeiouaeiouaeiouaeiou):

 Googling for similar issues, I found an [https://github.com/Mbed-
 TLS/mbedtls/blob/dae21d3808be93c30fda318b19657b4db6ad2b5d/library/sha512.c#L54
 interesting comment] in the Mbed TLS repository:

 {{{
 /*
  * Best performance comes from most recent compilers, with intrinsics and
 -O3.
  * Must compile with -march=armv8.2-a+sha3, but we can't detect armv8.2-a,
 and
  * can't always detect __ARM_FEATURE_SHA512 (notably clang 7-12).
  *
  * GCC < 8 won't work at all (lacks the sha512 instructions)
  * GCC >= 8 uses intrinsics, sets __ARM_FEATURE_SHA512
  *
  * Clang < 7 won't work at all (lacks the sha512 instructions)
  * Clang 7-12 don't have intrinsics (but we work around that with inline
  *            assembler) or __ARM_FEATURE_SHA512
  * Clang == 13.0.0 same as clang 12 (only seen on macOS)
  * Clang >= 13.0.1 has __ARM_FEATURE_SHA512 and intrinsics
  */
 }}}

 Big Sur unlike buildbots uses Clang version 1300 => 13.0.0 by default. I
 don't want to block newer versions as the problem occurs  only on ARM64.

-- 
Ticket URL: <https://trac.macports.org/ticket/72205#comment:2>
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