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msteed
Bug in Newlib Header?
Posted on: 2022/3/30 7:49    #1
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I believe I've stumbled across a bug in one of the newlib header files (the ones from the most recent SDK). I was trying to compile GIFLIB, where one of the files has the following bit of code:

#ifndef SIZE_MAX
    #define SIZE_MAX     UINTPTR_MAX
#endif

It compiled fine when using clib2, but when using newlib I got the following error when SIZE_MAX was referenced:

In file included from openbsd-reallocarray.c:8:
openbsd-reallocarray.c: In function 'openbsd_reallocarray':
openbsd-reallocarray.c:25:19: error: 'ULONG_MAX' undeclared (first use in this function)
      nmemb > 0 && SIZE_MAX / nmemb < size) {
                   ^~~~~~~~
openbsd-reallocarray.c:25:19: note: 'ULONG_MAX' is defined in header '<limits.h>'; did you forget to '#include <limits.h>'?
openbsd-reallocarray.c:10:1:
+#include <limits.h>

The file indeed does not include <limits.h>, but it does include <stdint.h>. The clib2 version of <stdint.h> contains the following:

#ifndef    _LIMITS_H
#include <limits.h>
#endif /* _LIMITS_H */

So <stdint.h> includes <limits.h>, and everything works fine. The newlib version of <stdint.h>, however, contains the following:

#if defined(__GNUC__) && \
  ( (__GNUC__ >= 4) || \
    ( (__GNUC__ >= 3) && defined(__GNUC_MINOR__) && (__GNUC_MINOR__ > 2) ) )
/* gcc > 3.2 implicitly defines the values we are interested */
#define __STDINT_EXP(x) __##x##__
#else
#define __STDINT_EXP(x) x
#include <limits.h>
#endif

In other words, <limits.h> is included only if the version of GCC is 3.2 or earlier. That seems odd, which makes me think that "#include <limits.h>" should come after the #endif, not before it.

I made this change, and was able to build GIFLIB without error. I recompiled a number of my other projects, and nothing seems to have been broken by the change. But the flow of system headers can be complex and difficult to follow, so I thought I'd see if others can confirm that this is a bug, or explain why it isn't.
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walkero
Re: Bug in Newlib Header?
Posted on: 2022/3/30 11:35    #2
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@msteed
Yeah, it seems you are right. I will forward it to the os4 developers and will be fixed in the next SDK release, if not earlier.

Thank you for this message.
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Raziel
Re: Bug in Newlib Header?
Posted on: 2022/3/30 14:26    #3
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@walkero

As a workaround we could move
#include <limits.h>

from
#if defined(__GNUC__) && \ 
  ( (__GNUC__ >= 4) || \ 
    ( (__GNUC__ >= 3) && defined(__GNUC_MINOR__) && (__GNUC_MINOR__ > 2) ) ) 
/* gcc > 3.2 implicitly defines the values we are interested */ 
#define __STDINT_EXP(x) __##x##__ 
#else 
#define __STDINT_EXP(x) x 
#include <limits.h> 
#endif

to
#if defined(__GNUC__) && \ 
  ( (__GNUC__ >= 4) || \ 
    ( (__GNUC__ >= 3) && defined(__GNUC_MINOR__) && (__GNUC_MINOR__ > 2) ) ) 
/* gcc > 3.2 implicitly defines the values we are interested */ 
#define __STDINT_EXP(x) __##x##__ 
#else 
#define __STDINT_EXP(x) x 
#endif
#include <limits.h>


for a quick fix...correct?
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walkero
Re: Bug in Newlib Header?
Posted on: 2022/3/30 15:51    #4
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@Raziel
I think that's what msteed described as a solution that worked for him as well. So, yeah, until the next SDK release it would be wise to do so.
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msteed
Re: Bug in Newlib Header?
Posted on: 2022/3/31 0:15    #5
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@Raziel, @walkero

Quote:
I think that's what msteed described as a solution that worked for him as well.

Yes, that's exactly what I did.

The bug seems to be something that's rarely encountered, since it's been around for some time (it was in at least the previous version of the SDK (53.30), too).
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Raziel
Re: Bug in Newlib Header?
Posted on: 2022/3/31 7:06    #6
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@walkero

workaround in place...nice catch, thank you

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