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From:	Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: SIGILL 386 (illegal opcode)
Organization:	Systematic Software
Message-ID:	<9rd4bvg7og892lbmhs2ui14bletapqs147@4ax.com>
References:	<b8oqgi$1s2b$1 AT hq DOT mark-itt DOT ru> <3eb08a5a$0$79355$cc7c7865 AT news DOT luth DOT se> <b8qpgj$2tb4$1 AT hq DOT mark-itt DOT ru>
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Date:	Fri, 02 May 2003 09:24:56 GMT
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

On Thu, 1 May 2003 14:29:32 +0500 in comp.os.msdos.djgpp, "Alexei
K." <kzua AT kzua DOT udm DOT ru> wrote:

>"Martin Str|mberg" <ams AT speedy DOT ludd DOT luth DOT se> сообщил/сообщила в новостях следующее:
>news:3eb08a5a$0$79355$cc7c7865 AT news DOT luth DOT se...
>> If you get SIGILL we want more information. Like what program and
>> source? Command line? Result?
>
>My project works fine with 386 CPU, if it compiles by DJGPP gpp 2.952.
>I have just recompiled my project by DJGPP gpp 3.2.2
>(with -m386 option enabled) and program has failed only on 386 PC.
>I deeply use STL. Was libstdxx.a library compiled for 386 CPU?
>How can I rebuild libstdxx.a?
>My problem seems to be similar to which I have found in
>comp.os.msdos.djgpp archive on www.google.com.
[snip]
>I have not found the solution of the problem shown above.
>So, What is the solution?

Try -march=i386 -mfpmath=387 as typing: 

info gcc Invoking Submodel i386

shows:

`-mcpu=CPU-TYPE'
Tune to CPU-TYPE everything applicable about the generated code,
except for the ABI and the set of available instructions.  
...
While picking a specific CPU-TYPE will schedule things
appropriately for that particular chip, the compiler will not
generate any code that does not run on the i386 without the
`-march=CPU-TYPE' option being used.

So -mcpu is a tuning option that does not restrict the
instruction set, while -march is a restrictive option, and
-march=x also implies -mcpu=x. 

Thanks. Take care, Brian Inglis 	Calgary, Alberta, Canada
-- 
Brian DOT Inglis AT CSi DOT com 	(Brian dot Inglis at SystematicSw dot ab dot ca)
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