Which version of FreeBSD a binary was compiled for?

Andrew P. infofarmer at gmail.com
Fri Oct 28 00:27:38 PDT 2005


On 10/28/05, Micah <micahjon at ywave.com> wrote:
> David Kirchner wrote:
> > On 10/27/05, Will Maier <willmaier at ml1.net> wrote:
> >
> >>Must be -- some flag produces unique bits in the executables. I'm a
> >>little surprised there isn't (AFAICT) anything descriptive in
> >>file(1)'s manpage or /u/s/mi/magic that would explain the
> >>discrepancy. Didn't see anything in quick looks through gcc(1) or
> >>make(1), either.
> >>
> >>Weird.
> >
> >
> > It doesn't look like it's done in the magic file. Rather, it's
> > something built in to file itself. Check out around line 400 of
> > 'readelf.c'.
> >
> > This doesn't explain how it gets in to the binaries built, though.
>
> Here's some more to think about.  I have a simple cpp program I used to
> test something a while back.  Running file on that executable returns:
>
> trisha% file floatpoint
> floatpoint: ELF 32-bit LSB executable, Intel 80386, version 1 (FreeBSD),
> for FreeBSD 5.3.0, dynamically linked (uses shared libs), not stripped
>
> I just now recompiled with "c++ floatpoint.cpp" and now:
> trisha% file a.out
> a.out: ELF 32-bit LSB executable, Intel 80386, version 1 (FreeBSD),
> dynamically linked (uses shared libs), not stripped
>
> And compiled with same commandline on the "working" machine:
> alexis% file a.out
> a.out: ELF 32-bit LSB executable, Intel 80386, version 1 (FreeBSD), for
> FreeBSD 5.4, dynamically linked (uses shared libs), not stripped
>
> I looked at my "env", but I do not see /any/ compiler related variables
> set.  Is there something up with the compiler itself?  My processor?
> (Athlon64 in i386 mode)
>
> Later,
> Micah
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Clearly, something has changed in the compiler suite.


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