[MacPorts] #70859: GMP build with GCC, not Clang

[MacPorts]

#70859: GMP build with GCC, not Clang
-----------------------+---------------------
  Reporter:  haberg-1  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  ventura
      Port:  gmp       |
-----------------------+---------------------

Comment (by kencu):

 If you download the current gmp software from here:

 https://gmplib.org/download/gmp/gmp-6.3.0.tar.xz

 decompress it and just build in on a current arm64 Mac system, outside of
 MacPorts, just with standard tools (Xcode and CLT installed, clang and
 standard tools used) you get a 100% pass:

 {{{
 ========================================
    GNU MP 6.3.0: tests/test-suite.log
 ========================================

 # TOTAL: 8
 # PASS:  8
 # SKIP:  0
 # XFAIL: 0
 # FAIL:  0
 # XPASS: 0
 # ERROR: 0

 .. contents:: :depth: 2

 }}}


 I realize, looking at the above message and <https://gmplib.org/list-
 archives/gmp-bugs/2024-June/005494.html>, there is an alignment error with
 the x86_64 assembly code that now flags on MacOS as recent MacOS versions
 are intolerant of unaligned pointers. We have several MacPorts tickets
 about software trying to force unaligned pointers and Xcode clang / linker
 rejecting that.

 The unaligned pointer issue seemed to be in one assembly file
 {{{bdiv_q_1.asm}}}. I noticed that file was forcing a low alignment of 8:

 https://github.com/gmp-
 mirror/gmp/blob/14fe69d7f56e00917e9fd9ab616afc798a1af6c1/mpn/x86_64/bdiv_q_1.asm#L137

 I wondered if that might be the problem. I haven't as yet tried to fix it
 though.

 So it might be premature to say clang is broken here.

-- 
Ticket URL: <https://trac.macports.org/ticket/70859#comment:1>
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