[MacPorts] #54602: git @2.14.1 generates corrupt SHA1 hashes on Tiger when built with gcc42, but works OK when built with gcc6

[MacPorts]

#54602: git @2.14.1 generates corrupt SHA1 hashes on Tiger when built with gcc42,
but works OK when built with gcc6
--------------------+-----------------
 Reporter:  kencu   |      Owner:
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:  tiger   |       Port:  git
--------------------+-----------------
 This is a somewhat odd one. It's a corner case to be sure, but I thought
 I'd note it here as others are likely to run into it as well, I think.

 Came across this after the recent upgrade of git, which builds without
 errors with gcc-4.2 by default on Tiger. On Tiger, git was unable to add
 or commit files after the upgrade to 2.14.1; also unable to clone
 repositories, with errors such as:
 {{{
 $ sudo git clone https://github.com/kencu/TigerPorts.git
 Cloning into 'TigerPorts'...
 remote: Counting objects: 475, done.
 remote: Compressing objects: 100% (9/9), done.
 remote: Total 475 (delta 0), reused 9 (delta 0), pack-reused 465
 Receiving objects: 100% (475/475), 206.52 KiB | 538.00 KiB/s, done.
 fatal: pack is corrupted (SHA1 mismatch)
 fatal: index-pack failed
 }}}
 I tried rebuilding it again using the default gcc-4.2, but ran into the
 same errors.

 Rebuilding git 2.14.1 using gcc6 however generates a normally-working git:
 {{{
 $ sudo git clone https://github.com/kencu/TigerPorts.git
 Cloning into 'TigerPorts'...
 remote: Counting objects: 475, done.
 remote: Compressing objects: 100% (9/9), done.
 remote: Total 475 (delta 0), reused 9 (delta 0), pack-reused 465
 Receiving objects: 100% (475/475), 206.52 KiB | 599.00 KiB/s, done.
 Resolving deltas: 100% (112/112), done.
 }}}
 Just to make it nice and confusing, the same version of git works
 perfectly well on Leopard PPC when built with gcc-4.2.

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Ticket URL: <https://trac.macports.org/ticket/54602>
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