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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: PING!Hello,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.
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There was a thread about this general topic awhile ago. That GMP actively uses -DPIC to select the correct assembly came up: http://lists.gnu.org/archive/html/libtool/2003-01/msg00060.html
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. Gerrit -- =^..^=
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