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Re: Ping: Cygwin libtool / assembler problem with -DPIC

From: Gerrit P. Haase
Subject: Re: Ping: Cygwin libtool / assembler problem with -DPIC
Date: Wed, 13 Oct 2004 23:48:55 +0200
User-agent: Mozilla/5.0 (Windows; U; WinNT4.0; de-AT; rv:1.7.3) Gecko/20040910

Noah Misch wrote:
On Tue, Oct 12, 2004 at 03:29:10PM +0200, Gerrit P. Haase wrote:

Gerrit wrote:



With GNU as PIC is not an noop, when -DPIC is used to invoke gas the
generated assembly is broken.  I saw this problem with a
reautoconfiscated version of GMP.  This may be unusual, but there was
libtool used to invoke gas.

What do you mean by ``the generated assembly is broken''?  Please show the error
you encountered.

I built gmp-4.1.4 on Cygwin, and it passed all tests.  I used the shipped
``configure'', but adding -DPIC is not a new libtool behavior.
There was a thread about this general topic awhile ago.  That GMP actively uses
-DPIC to select the correct assembly came up:

I saw that -DPIC was used on Cygwin to compile assembly and it couldn't be
linked.  Also I read in the GMP sources somewhere that libtool adds this
flag where it is a noop on Cygwin when not compiling assembler code where
it breaks things, so the conclusion was to remove the flag entirely when
platform is Cygwin, I was able to build GMP and thats it.

Unfortunately I have no logs, but I tracked it down and realized that
this flag is the culprit and removing it resolves my problem.  Even
more bad that the demo I suspect to show the error doesn't build at all
with the recent Cygwin release (demos/expr).

Anyway, this flag is used where it is completely useless, so please
remove it, patch was already submitted to the Cygwin libtool maintainer.


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