Date: Thu, 27 Oct 2005 20:11:23 -0700 From: Micah <micahjon@ywave.com> To: David Kirchner <dpk@dpk.net> Cc: freebsd-questions@freebsd.org Subject: Re: Which version of FreeBSD a binary was compiled for? Message-ID: <436196DB.9000408@ywave.com> In-Reply-To: <35c231bf0510271220i2fb3de62g55a80f3d06f03355@mail.gmail.com> References: <cb5206420510251524r32ddd9adx7d4fdce8f82a85be@mail.gmail.com> <17247.39311.203645.265116@jerusalem.litteratus.org> <cb5206420510260818p664df038g39a1035c747ac315@mail.gmail.com> <200510262115.48144.krinklyfig@comcast.net> <cb5206420510270116k27ad6e13r5dd17dbc7323c01f@mail.gmail.com> <4360DB59.7010900@ywave.com> <20051027154408.GS29508@localdomain> <43611E22.5030408@ywave.com> <20051027185157.GV29508@localdomain> <35c231bf0510271220i2fb3de62g55a80f3d06f03355@mail.gmail.com>
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David Kirchner wrote: > On 10/27/05, Will Maier <willmaier@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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