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Re: Bug#219490: libtool: Completely dumb assumption can make -fPIC test

From: Scott James Remnant
Subject: Re: Bug#219490: libtool: Completely dumb assumption can make -fPIC test fail
Date: Fri, 07 Nov 2003 03:03:57 +0000

package libtool
tags 219490 upstream

On Thu, 2003-11-06 at 22:16, Josselin Mouette wrote:

> The test for whether the -fPIC flag is working is completely stupid.
> I've obtained this in the configure script of a package generated with 
> libtool 1.5-4:
> [blah blah blah test of a 1-line program with -fPIC]
>    if (exit $ac_status) && test -s "$ac_outfile"; then
>      # The compiler can only warn and ignore the option if not recognized
>      # So say no if there are warnings
> The comments says all. Of course there can be other warnings! Especially
> given that the test re-uses all previously set compiler flags!
> Luckily, GCC is not prone to give warnings with 1-liners C files. Still, 
> for example, using -Wpadded, it will on powerpc and alpha. This example 
> made hdf5 FTBFS because -fPIC was wrongly detected as non-working on 
> these arches.
Could you suggest an alternate test?

Have you ever, ever felt like this?
Had strange things happen?  Are you going round the twist?

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