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Re: Ping: Cygwin libtool / assembler problem with -DPIC
Noah Misch wrote:
On Tue, Oct 12, 2004 at 03:29:10PM +0200, Gerrit P. Haase 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
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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