Re: base relocations and vtune

[Amos Anderson <nitroamos at gmail dot com>]

thanks for responding.

For intel's vtune to be able to provide call graph functionality, it
claims to require "base relocations". upon presenting this warning, it
suggests that if one is using the visual studio compiler, that the
/FIXED:NO flag be provided to the compiler. microsoft's msdn has this
to say on the subject:

http://msdn2.microsoft.com/library/w368ysh2(en-us,vs.80).aspx

which explains that /FIXED:NO will "generate a relocation section in
the program" and that this flag is the default when building a DLL,
but not default for any other project type. this is a topic that I do
not understand short of putting english words together...

how do i "generate a relocation section" for a random program that i'm
trying to build on my own? i'm not trying to build a dll... just a
command line executable (if that's different...).

i'll try that ld command and see if it makes a difference...

thanks!

amos.

On 8/26/05, Larry Hall <lh-no-personal-replies-please@cygwin.com> wrote:
> At 01:15 PM 8/26/2005, you wrote:
> >hello -- i'm trying to figure out how to profile my code compiled with
> >gcc/cygwin with intel vtune's call graph.
> >
> >this might be a problem specific to the call graph functionality itself.
> >
> >i was able to instrument all my program with vtune so i can run the
> >call graph activity, but i get the warning "Module does not contain
> >base relocations." a popup message informs me about the /fixed:no
> >change for use with visual studio -- but i've been unable to find an
> >analogous makefile modification for gcc/cygwin.
> >
> >when i run the call graph activity on my executables, it runs just
> >fine, but none of my functions show up in the call list. only system
> >dll functions show up -- and the graph attempts to build a tree out of
> >cygwin1.dll, kernel32.dll, et al.
> >
> >by searching i found the "GCC for Windows help" thread, which seems to
> >touch on this issue
> >http://sourceware.org/ml/cygwin/2003-05/msg00436.html
> >but i don't understand what they're talking about (i don't know what
> >"base relocations" themselves are...)
> >
> >i would appreciate any guidance on this topic.
> 
> 
> You haven't really given much detail of what you're trying to do and
> where you see problems.  Based on the minimal information above, I'm
> going to guess that the problem is with your own DLL (since you imply
> other system and Cygwin DLLs don't have a problem and don't give you
> the warning.)  If that's the case, I suggest you use the User's Guide
> section on building DLLs as a guide:
> 
> <http://cygwin.com/cygwin-ug-net/dll.html#dll-build>
> 
> If you're having a problem because other DLLs you're using collide with
> the default base image address of your DLL, you can specify a different
> base address when you build your DLL by using the '--enable-auto-image-base'
> switch of 'ld'.  See the man page for more details.
> 
> 
> 
> --
> Larry Hall                              http://www.rfk.com
> RFK Partners, Inc.                      (508) 893-9779 - RFK Office
> 838 Washington Street                   (508) 893-9889 - FAX
> Holliston, MA 01746
> 
> 
>

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