> Date: Thu, 14 Dec 2000 20:11:41 -0600 (CST)
> From: David Talkington <[EMAIL PROTECTED]>
> Hello all --
>
> Please let me qualify the following by saying that a) I'm not
> C-literate, and b) I'll be perfectly happy with links to FAQs, or a
> more appropriate forum to which to direct these questions.
>
> If I wish to compile a binary on a fast machine and transfer this
> binary to another box of lesser architecture and an older Linux
> kernel, what steps are required? (I'm restricting my scope to Intel
> processors here.) For instance, if I build ssh on an i686 with
> 2.2.17, and want to run this binary on an i486 with 2.2.14, what must
> I do? 'man gcc' suggests that the -b option is relevant, but it also
> says "This is useful when you have installed GNU CC as a
> cross-compiler", suggesting that there is some other configuration to
> be done to gcc before I should try that ... and that doesn't address
> the issue of kernel version.
>
> Similarly, if I'm compiling someone else's source on the
> aforementioned i686 and I want the binary to be optimized for that
> processor, need I do anything special? The man page says this about
> the -b switch: "When you do not specify `-b', it normally means to
> compile for the same type of machine that you are using." However, it
> has been suggested to me that some extra flags to gcc in the makefile
> may be required to make this explicit. I'd like some general guidance
> on this before I start mucking about.
>
> Thank you for any suggestions.
A cross-compiler is for entirely different architectures (like
compiling a i386 binary using a SPARC machine). You're just looking
at different variations of i386. Unless you are invoking gcc with
various -m options, the code should run on any Intel chip.
If you want to learn how to optimize for a specific architecture
(which will prevent it from running on an earlier architecture), try:
info gcc (or use emacs) and follow the links:
invoking gcc, submodel options, i386 options.
HTH,
Dave
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