libtool / assembler problem with -DPIC

[Gerrit P. Haase]

Reini wrote:

> Charles Wilson schrieb:
>> 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.
>>>
>>> While -DPIC is a noop for usual compilation, it is harmful when used
>>> as gas flag to compile assembly, I suggest to remove it entirely when
>>> target is cygwin. Change would be in libtool.m4 line 4971 ff in
>>> libtool-1.5.10.
>>>
>>> Alternative: don't pass flag through when gas is called.
>> 
>> I don't see anywhere that "-DPIC" is ever invoked on cygwin.  Please 
>> send a patch to libtool.m4 that fixes the problem for you.

> The problem is when a user (or makefile) adds this -DPIC, which does no
> harm usually. Gerrit thought that it might be clever to strip it on 
> cygwin when gas is involved, since this does harm.
> Or maybe emit a warning to fix the makefile for cygwin.
> (Gerrit: Really -DPIC, not -fPIC?)

No.  Libtool adds this flag regardless what in your Makefile.am is.



Gerrit
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