[GHC] #9213: Maybe important CPP warnings on ghcautoconf.h from cpphs

[GHC]

#9213: Maybe important CPP warnings on ghcautoconf.h from cpphs
-------------------------------------+-------------------------------------
              Reporter:  asr         |            Owner:
                  Type:  bug         |           Status:  infoneeded
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.4-rc1
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Description changed by asr:

Old description:

> cpphs 1.18.5 yields the following warning:
>
> {{{
> Warning: trailing characters after #if directive in file ...
> /ghcautoconf.h  at line 383 col 1:  AC_APPLE_UNIVERSAL_BUILD
> }}}
>
> I guess it is necessary to replace `#if defined` by `#ifdef` in the line
> {{{
> #if defined AC_APPLE_UNIVERSAL_BUILD
> }}}
> from the mk/config.h.in file.
>
> Note the next line
> {{{
> # if defined __BIG_ENDIAN__
> }}}
> has the same issue.

New description:

 cpphs 1.18.6 yields the following warning:

 {{{
 Warning: trailing characters after #if directive in file ...
 /ghcautoconf.h  at line 383 col 1:  AC_APPLE_UNIVERSAL_BUILD
 }}}

 I guess it is necessary to replace `#if defined` by `#ifdef` in the line
 {{{
 #if defined AC_APPLE_UNIVERSAL_BUILD
 }}}
 from the mk/config.h.in file.

 Note the next line
 {{{
 # if defined __BIG_ENDIAN__
 }}}
 has the same issue.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9213#comment:5>
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