GNU bug report logs - #9728
Incorrect -L flags order for HP-UX

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From: Peter O'Gorman <peter <at> pogma.com>
To: vincent <at> vinc17.net, 9728 <at> debbugs.gnu.org
Subject: bug#9728: Incorrect -L flags order for HP-UX
Date: Thu, 13 Oct 2011 09:06:22 -0500

[Message part 1 (text/plain, inline)]

On 10/13/2011 05:32 AM, Vincent Lefevre wrote:
> On 2011-10-12 21:52:36 -0500, Peter O'Gorman wrote:
>> If the flags were added by the user, they could set LIBS=-L/opt/gnu/lib
>> instead on some platfroms, but that won't work on HP-UX either because its
>> linker is rather strict that -L flags for paths that contain the library be
>> ordered before the -l flag for that library.
>>
>> Anyway, the problem can be avoided by not putting the -L and -l flags for
>> gmp in LDFLAGS and LIBS, instead put both in e.g. GMP_LIBS,
>> (GMP_LIBS="-L/opt/gnu/lib -lgmp"), then add $(GMP_LIBS) to LDADD.
>
> This doesn't work with autoconf's AC_CHECK_LIB and other tests.
> And using LDFLAGS for autoconf and LDADD in the Makefile would
> be quite hard to maintain due to the risk of inconsistencies.
>
> autoconf and libtool should agree on the way to add -L flags.
>

Hi Vincent,

Well, if this is a bug at all, it is an automake/autoconf one, libtool 
does not set the order of flags in Makefile.in, but I don't believe that 
it is a bug.

LDFLAGS, CFLAGS, etc are for the user to set. It should be possible for 
the user to build a package doing ./configure ..options..; make 
LDFLAGS=-fancyflag CPPFLAGS=-I/want/coffee;

http://www.gnu.org/prep/standards/standards.html#Command-Variables

The usual way to get specific flags set to allow this is to save 
LDFLAGS, CPPFLAGS etc. before doing an autoconf test, do the test, then 
restore the original flags.

Something like the attached patch should work for mpfr.

Peter

[mpfr.diff (text/x-patch, attachment)]

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