[MacPorts] #67135: libgcc7 fails to build in OSX Tiger

[MacPorts]

#67135: libgcc7 fails to build in OSX Tiger
-------------------------+-----------------------
  Reporter:  SamBushman  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  tiger ppc
      Port:  libgcc7     |
-------------------------+-----------------------

Comment (by ryandesign):

 Replying to [ticket:67135 SamBushman]:
 > `:info:build
 /opt/local/var/macports/buils/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/work/gcc-7.5.0/gcc
 /fold-const.c:6714: error: 'LT_eXPR' was not declared in this scope`

 Line 6714 of fold-const.c in gcc 7.5.0 actually mentions `LT_EXPR`, not
 `LT_eXPR`:

 https://github.com/gcc-mirror/gcc/blob/releases/gcc-7.5.0/gcc/fold-
 const.c#L6714

 It sounds like a single-bit error has occurred on your computer during the
 extraction of the gcc 7.5.0 source code (probably a
 [https://en.wikipedia.org/wiki/Soft_error soft error]):

 `E` is `0x65` is `0b1100101` \\
 `e` is `0x45` is `0b1000101`

 Hopefully only one single-bit error has occurred, and you can edit the
 fold-const.c file and replace the erroneous `LT_eXPR` on line 6714 with
 the correct `LT_EXPR` and then reattempt your port install or upgrade.

 Alternatively, you could `sudo port clean libgcc7` and try again and the
 same single-bit error probably won't occur again, but this is a large port
 that will take hours or days to build on a PowerPC Mac so you may want to
 save yourself the time that you've already invested in building the port
 to this point and instead fix the offending file and continue the build.

 Using [https://en.wikipedia.org/wiki/ECC_memory ECC memory], if your
 computer supports it, can correct single-bit errors before they cause such
 problems.

-- 
Ticket URL: <https://trac.macports.org/ticket/67135#comment:3>
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