Re: [Chicken-janitors] #1107: Compiling with OpenBSD's gcc-4.2.1 produces 2 warnings when compiling posixunix.c

[Chicken Trac]

#1107: Compiling with OpenBSD's gcc-4.2.1 produces 2 warnings when compiling
posixunix.c
-----------------------------+----------------------------------------------
  Reporter:  ckeen           |       Owner:       
      Type:  defect          |      Status:  new  
  Priority:  critical        |   Milestone:  4.9.0
 Component:  core libraries  |     Version:  4.8.x
Resolution:                  |    Keywords:       
-----------------------------+----------------------------------------------

Old description:

> The line numers differ from building the latest dev snapshot and master
> but the source code line is the same:
>
> {{{
> posixunix.c:9214: warning: array size (4) smaller than bound length
> (1024)
> }}}
>
> The line in question contains:
>
> {{{
> t3=C_curdir(t2);
> }}}
>
> The second warning is generated for the line:
>
> {{{
>  t2= C_do_readlink(t1,((C_word*)t0)[2]);
> }}}
>
> Compiling with a newer gcc (4.8.2) from ports does not show these, so
> this might be a compiler optimisation bug in gcc or a bogus warning.
>
> Compiling with -O0 still produced the warnings.
>
> This has been observed on a 32-bit i386 Openbsd 5.5-current machine.

New description:

 The line numers differ from building the latest dev snapshot and master
 but the source code line is the same:

 {{{
 posixunix.c:9214: warning: array size (4) smaller than bound length (1024)
 }}}

 The line in question contains:

 {{{
 t3=C_curdir(t2);
 }}}

 The second warning is generated for the line:

 {{{
  t2= C_do_readlink(t1,((C_word*)t0)[2]);
 }}}

 Compiling with a newer gcc (4.8.2) from ports does not show these, so this
 might be a compiler optimisation bug in gcc or a bogus warning.

 Compiling with -O0 still produced the warnings.

 This has been observed on a 32-bit i386 Openbsd 5.5-current machine.

--

Comment(by sjamaan):

 This seems to be due to #778.  For some reason gcc doesn't define the
 standard that's being used (perhaps we should add --std=c99 just in case?
 But then it would break on platforms that have an older gcc)

-- 
Ticket URL: <http://bugs.call-cc.org/ticket/1107#comment:1>
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