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Re: [PATCH] Re: Problem on rs6000-ibm-aix4.3.2.0 (Fortran) -DPIC

From: Simon Richter
Subject: Re: [PATCH] Re: Problem on rs6000-ibm-aix4.3.2.0 (Fortran) -DPIC
Date: Thu, 16 Jan 2003 14:30:00 +0100
User-agent: Mutt/1.4i


> Ok, here it is.  This patch changes AC_LIBTOOL_PROG_COMPILER_PIC
> so that it only appends -DPIC to the default "C" tag and the CXX
> tag for C++.  I would also like to deprecate -DPIC in the 1.5 release
> to make it clear we intend to do away with it.  I would also like
> to ask anyone who does depend on this to let us know when/where/why &
> how
> so we can add a section to the documentation on how to modify
> code to not need -DPIC.

Inline assembler is compiler dependent anyway. So for inline assembler
the correct syntax is

#if defined(__GNUC__) && !defined(__PIC__) && defined(__i386)
        asm( /* Non-PIC asm implementation */ )
        /* C implementation */

or, respectively

#if defined(__GNUC__) && defined(__i386)
        asm( /* PIC asm implementation */ )
        /* C implementation */

Perhaps there should also be a small comment why #ifndef __PIC__ is not

If you have compiler independent code that you want to conditionally
compile depending on the PIC setting, you have a real problem now, since
there is no longer a standardized preprocessor symbol, and you cannot
work around that. It may be worth investigating whether glibc has such
portions (they don't use libtool, but set -DPIC for themselves when
compiling the shared library; there are lots of #ifdef PIC in the code)
and whether this warrants a check in configure whether we need to set
-D__PIC__ in order to get that feature back.


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