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Subject: bug#9728: Incorrect -L flags order for HP-UX
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With libtool 2.4 and automake 1.11.1, we have the following problem
for MPFR 3.1.0. We have received a bug report saying that when the
tests are run on a HP-UX machine, the following command is run:

libtool: link: gcc -O2 -s -o tversion tversion.o  -L/opt/gnu/lib ./.libs/libfrtests.a -lm -L../src/.libs -lmpfr -lgmp -Wl,+b -Wl,/xxx/gnu/mpfr-3.1.0/objdir/src/.libs:/opt/gnu/lib

The problem is that -L../src/.libs comes after -L/opt/gnu/lib, so that
linking is done against the MPFR version installed in /opt/gnu/lib
instead of the one from ../src/.libs, which has just been compiled.

-L/opt/gnu/lib comes from LDFLAGS (set up by the configure script);
it is needed to find some other library (GMP). -L../src/.libs is
added to find the MPFR library to be tested (it is necessary under
HP-UX). It seems to be added to $LIBS, where in tests/Makefile.in,
one gets:

LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
        --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) \
        $(LDFLAGS) -o $@

tversion$(EXEEXT): $(tversion_OBJECTS) $(tversion_DEPENDENCIES)
        @rm -f tversion$(EXEEXT)
        $(LINK) $(tversion_OBJECTS) $(tversion_LDADD) $(LIBS)

Note: the problem cannot be reproduced under Linux, as
../src/.libs/libmpfr.so is used instead of -L... -lmpfr.

Thread of the bug report:
  http://websympa.loria.fr/wwsympa/arc/mpfr/2011-10/msg00042.html

-- 
Vincent Lef�vre <vincent@HIDDEN> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / Ar�naire project (LIP, ENS-Lyon)

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Subject: bug#9728: Acknowledgement (Incorrect -L flags order for HP-UX)
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Subject: bug#9728: Incorrect -L flags order for HP-UX
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Date: Wed, 12 Oct 2011 21:52:36 -0500
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On 10/11/2011 08:58 AM, Vincent Lefevre wrote:
> With libtool 2.4 and automake 1.11.1, we have the following problem
> for MPFR 3.1.0. We have received a bug report saying that when the
> tests are run on a HP-UX machine, the following command is run:
>
> libtool: link: gcc -O2 -s -o tversion tversion.o  -L/opt/gnu/lib ./.libs/libfrtests.a -lm -L../src/.libs -lmpfr -lgmp -Wl,+b -Wl,/xxx/gnu/mpfr-3.1.0/objdir/src/.libs:/opt/gnu/lib
>
> The problem is that -L../src/.libs comes after -L/opt/gnu/lib, so that
> linking is done against the MPFR version installed in /opt/gnu/lib
> instead of the one from ../src/.libs, which has just been compiled.

Hi Vincent,

Unfortunately this is a fairly common problem.

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.

Peter

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Subject: bug#9728: Incorrect -L flags order for HP-UX
Resent-From: Vincent Lefevre <vincent@HIDDEN>
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Date: Thu, 13 Oct 2011 11:26:56 +0200
From: Vincent Lefevre <vincent@HIDDEN>
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Hi Peter,

On 2011-10-12 21:52:36 -0500, Peter O'Gorman wrote:
> Unfortunately this is a fairly common problem.

Will this eventually be fixed? For instance libtool/automake could
put the -Lrelative/path in a variable that would appear before
$(LDFLAGS).

Otherwise the autoconf manual should be corrected, as it currently
says to use LDFLAGS for -L options.

> If the flags were added by the user, they could set LIBS=3D-L/opt/gnu/l=
ib
> 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 librar=
y be
> ordered before the -l flag for that library.
>=20
> Anyway, the problem can be avoided by not putting the -L and -l flags f=
or
> gmp in LDFLAGS and LIBS, instead put both in e.g. GMP_LIBS,
> (GMP_LIBS=3D"-L/opt/gnu/lib -lgmp"), then add $(GMP_LIBS) to LDADD.

OK, I'll try that.

--=20
Vincent Lef=E8vre <vincent@HIDDEN> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / Ar=E9naire project (LIP, ENS-Lyon)

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On 2011-10-12 21:52:36 -0500, Peter O'Gorman wrote:
> If the flags were added by the user, they could set LIBS=3D-L/opt/gnu/l=
ib
> 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 librar=
y be
> ordered before the -l flag for that library.
>=20
> Anyway, the problem can be avoided by not putting the -L and -l flags f=
or
> gmp in LDFLAGS and LIBS, instead put both in e.g. GMP_LIBS,
> (GMP_LIBS=3D"-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.

--=20
Vincent Lef=E8vre <vincent@HIDDEN> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / Ar=E9naire project (LIP, ENS-Lyon)

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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

--------------080206080909050106000700
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 filename="mpfr.diff"

--- ./tests/Makefile.am.orig	2011-10-13 12:38:25.706848813 +0000
+++ ./tests/Makefile.am	2011-10-13 12:49:01.617145045 +0000
@@ -42,8 +42,8 @@
 
 EXTRA_DIST = tgeneric.c tgeneric_ui.c mpf_compat.h inp_str.data tmul.dat
 
-LDADD = libfrtests.la $(MPFR_LIBM) $(top_builddir)/src/libmpfr.la
-INCLUDES = -I$(top_srcdir)/src -I$(top_builddir)/src
+LDADD = libfrtests.la $(MPFR_LIBM) $(top_builddir)/src/libmpfr.la $(GMP_LIBS)
+AM_CPPFLAGS = -I$(top_srcdir)/src -I$(top_builddir)/src $(GMP_CPPFLAGS)
 
 # LOADLIBES (documented in the "GNU make" manual and equivalent to LDLIBS)
 # enables to compile a program foo.c in the test directory by simply doing
@@ -54,7 +54,7 @@
 # Moreover, dependencies are not tracked. Thus you may want to run
 # "make tversion" (for instance) just before, to make sure that every
 # dependency has been rebuilt.
-LOADLIBES=$(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS) $(top_builddir)/tests/.libs/libfrtests.a $(top_builddir)/src/.libs/libmpfr.a $(LIBS) $(MPFR_LIBM)
+LOADLIBES=$(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS) $(top_builddir)/tests/.libs/libfrtests.a $(top_builddir)/src/.libs/libmpfr.a $(LIBS) $(MPFR_LIBM) $(GMP_LIBS)
 
 check_LTLIBRARIES = libfrtests.la
 libfrtests_la_SOURCES = mpfr-test.h memory.c rnd_mode.c tests.c cmp_str.c random2.c
--- ./src/Makefile.am.orig	2011-10-13 12:38:25.747671563 +0000
+++ ./src/Makefile.am	2011-10-13 12:39:36.024692542 +0000
@@ -8,6 +8,7 @@
 # even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 # PARTICULAR PURPOSE.
 
+AM_CPPFLAGS = $(GMP_CPPFLAGS)
 
 EXTRA_DIST = round_raw_generic.c jyn_asympt.c x86/core2/mparam.h        \
 	x86/mparam.h x86_64/core2/mparam.h x86_64/pentium4/mparam.h  	\
@@ -57,7 +58,7 @@
 scale2.c set_z_exp.c ai.c gammaonethird.c ieee_floats.h			\
 grandom.c
 
-libmpfr_la_LIBADD = @LIBOBJS@
+libmpfr_la_LIBADD = @LIBOBJS@ $(GMP_LIBS)
 
 # Libtool -version-info CURRENT[:REVISION[:AGE]] for libmpfr.la
 #
--- ./tune/Makefile.am.orig	2011-10-13 12:38:25.768653665 +0000
+++ ./tune/Makefile.am	2011-10-13 12:49:41.404012941 +0000
@@ -8,19 +8,19 @@
 # even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 # PARTICULAR PURPOSE.
 
-
+AM_CPPFLAGS = $(GMP_CPPFLAGS)
 EXTRA_PROGRAMS = tuneup speed bidimensional_sample
 
 tuneup_SOURCES = tuneup.c
-tuneup_LDADD = -lspeed $(top_builddir)/src/libmpfr.la
+tuneup_LDADD = -lspeed $(top_builddir)/src/libmpfr.la $(GMP_LIBS)
 tuneup_LDFLAGS = -static
 
 speed_SOURCES = speed.c
-speed_LDADD = -lspeed $(top_builddir)/src/libmpfr.la
+speed_LDADD = -lspeed $(top_builddir)/src/libmpfr.la $(GMP_LIBS)
 speed_LDFLAGS = -static
 
 bidimensional_sample_SOURCES = bidimensional_sample.c
-bidimensional_sample_LDADD = -lspeed $(top_builddir)/src/libmpfr.la
+bidimensional_sample_LDADD = -lspeed $(top_builddir)/src/libmpfr.la $(GMP_LIBS)
 bidimensional_sample_LDFLAGS = -static
 
 INCLUDES = -I$(top_srcdir)/src -I$(top_builddir)/src
--- ./configure.ac.orig	2011-10-13 12:27:30.375020247 +0000
+++ ./configure.ac	2011-10-13 14:03:45.688749700 +0000
@@ -50,17 +50,17 @@
 unset gmp_lib_path GMP_CFLAGS GMP_CC
 AC_ARG_WITH(gmp_include,
    [  --with-gmp-include=DIR  GMP include directory ],
-   CPPFLAGS="$CPPFLAGS -I$withval")
+   [GMP_CPPFLAGS="-I$withval"])
 AC_ARG_WITH(gmp_lib,
    [  --with-gmp-lib=DIR      GMP lib directory ], [
-   LDFLAGS="$LDFLAGS -L$withval"
+   GMP_LDFLAGS="-L$withval"
    gmp_lib_path="$withval"
   ])
 AC_ARG_WITH(gmp,
    [  --with-gmp=DIR          GMP install directory ], [
    if test -z "$with_gmp_lib" && test -z "$with_gmp_include" ; then
-      CPPFLAGS="$CPPFLAGS -I$withval/include"
-      LDFLAGS="$LDFLAGS -L$withval/lib"
+      GMP_CPPFLAGS="-I$withval/include"
+      GMP_LDFLAGS="-L$withval/lib"
       gmp_lib_path="$withval/lib"
    else
       AC_MSG_FAILURE([Do not use --with-gmp and --with-gmp-include/--with-gmp-lib options simultaneously.])
@@ -71,8 +71,8 @@
    [  --with-gmp-build=DIR    GMP build directory (please read INSTALL file)],
    [
    if test -z "$gmp_lib_path" && test -z "$with_gmp_include" ; then
-      CPPFLAGS="$CPPFLAGS -I$withval -I$withval/tune"
-      LDFLAGS="$LDFLAGS -L$withval -L$withval/.libs -L$withval/tune"
+      GMP_CPPFLAGS="-I$withval -I$withval/tune"
+      GMP_LDFLAGS="-L$withval -L$withval/.libs -L$withval/tune"
       gmp_lib_path="$withval$PATH_SEPARATOR$withval/.libs$PATH_SEPARATOR$withval/tune"
       if test -r $withval/Makefile ; then
          GMP_CFLAGS=`$SED -n 's/^CFLAGS = //p' $withval/Makefile`
@@ -171,6 +171,10 @@
 dnl options); if the compiler changes due to __GMP_CC in gmp.h, one
 dnl would have incorrect settings.
 dnl FIXME: Move this in aclocal ?
+mpfr_save_LDFLAGS="$LDFLAGS"
+mpfr_save_CPPFLAGS="$CPPFLAGS"
+LDFLAGS="$GMP_LDFLAGS $LDFLAGS"
+CPPFLAGS="$GMP_CPPFLAGS $CPPFLAGS"
 if test -z "$GMP_CC$GMP_CFLAGS" ; then
    AC_MSG_CHECKING(for CC and CFLAGS in gmp.h)
    GMP_CC=__GMP_CC
@@ -448,11 +452,13 @@
 dnl is libgmp-3 (due to libtool versionning). The best solution
 dnl is to believe it works under MS-Windows.
 if test "$dont_link_with_gmp" = yes ; then
-LIBS="-lgmp $LIBS"
+GMP_LIBS="$GMP_LDFLAGS -lgmp"
 else
 
 dnl Check if we can link with GMP
-AC_CHECK_LIB(gmp, __gmpz_init, [LIBS="-lgmp $LIBS"],
+mpfr_save_LIBS="$LIBS"
+AC_CHECK_LIB(gmp, __gmpz_init, [GMP_LIBS="$GMP_LDFLAGS -lgmp"
+LIBS="-lgmp $LIBS"],
  [AC_MSG_ERROR(libgmp not found or uses a different ABI (including static vs shared).
 Please read the INSTALL file -- see "In case of problem".)])
 
@@ -511,7 +517,12 @@
 AC_CHECK_FUNCS([__gmpn_rootrem __gmpn_sbpi1_divappr_q])
 
 dnl End of tests which need to link with GMP.
+LIBS="$mpfr_save_LIBS"
 fi
+LDFLAGS="$mpfr_save_LDFLAGS"
+CPPFLAGS="$mpfr_save_CPPFLAGS"
+AC_SUBST([GMP_CPPFLAGS])
+AC_SUBST([GMP_LIBS])
 
 dnl Remove also many MACROS (AC_DEFINE) which are unused by MPFR
 dnl and polluate (and slow down because libtool has to parse them) the build.

--------------080206080909050106000700--

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Hi,

On 2011-10-13 09:06:22 -0500, Peter O'Gorman wrote:
> 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.

The autoconf manual says to use LDFLAGS for the -L options. So, it
is either a bug in the autoconf manual or in automake.

> LDFLAGS, CFLAGS, etc are for the user to set.

And this is what MPFR does with --with-gmp, which is a shorthand
for updating CPPFLAGS and LDFLAGS.

> It should be possible for the user to build a package doing
> ./configure ..options..; make LDFLAGS=3D-fancyflag
> CPPFLAGS=3D-I/want/coffee;

I don't think this should be allowed: MPFR does some tests at
configure time based on the current environment. If the user
modifies the environment at make time, the configure tests no
longer make sense (e.g. modifying LDFLAGS at make time can select
a different GMP version). So, if the user does this, it is up to
him to make sure that the changes are equivalent to what was set
at configure time.

> Something like the attached patch should work for mpfr.

There are several problems with it. First, I assume that LOADLIBES
should contain $(AM_CPPFLAGS) too. But the main problem is the
inconsistent flags order: in the compile command, $(AM_CPPFLAGS)
appears before $(CPPFLAGS), while in the link command, $(GMP_LIBS)
appears after $(LDFLAGS). This means that if the user uses both
--with-gmp and CPPFLAGS/LDFLAGS to provide search directories,
the include and library search paths will be inconsistent.

--=20
Vincent Lef=E8vre <vincent@HIDDEN> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / Ar=E9naire project (LIP, ENS-Lyon)

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On 10/13/2011 06:06 PM, Vincent Lefevre wrote:

>
>> Something like the attached patch should work for mpfr.
>
> There are several problems with it. First, I assume that LOADLIBES
> should contain $(AM_CPPFLAGS) too. But the main problem is the
> inconsistent flags order: in the compile command, $(AM_CPPFLAGS)
> appears before $(CPPFLAGS), while in the link command, $(GMP_LIBS)
> appears after $(LDFLAGS). This means that if the user uses both
> --with-gmp and CPPFLAGS/LDFLAGS to provide search directories,
> the include and library search paths will be inconsistent.
>

Ok, this is not a libtool bug though. When it can libtool will add the 
path to the .so instead of -L -l for libraries in the build dir. On many 
systems this works, but HP-UX is one of those systems where it does not, 
so -L -l are used instead. This can cause problems when an older version 
of the library is installed in $prefix.

Sorry that I can't help more.

Thanks,
Peter

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On 2011-10-13 18:21:35 -0500, Peter O'Gorman wrote:
> Ok, this is not a libtool bug though. When it can libtool will add the =
path
> to the .so instead of -L -l for libraries in the build dir. On many sys=
tems
> this works, but HP-UX is one of those systems where it does not, so -L =
-l
> are used instead. This can cause problems when an older version of the
> library is installed in $prefix.

Which tool is responsible for adding the -L with the relative path?

--=20
Vincent Lef=E8vre <vincent@HIDDEN> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / Ar=E9naire project (LIP, ENS-Lyon)

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On 2011-10-13 18:21:35 -0500, Peter O'Gorman wrote:
> Ok, this is not a libtool bug though. When it can libtool will add the =
path
> to the .so instead of -L -l for libraries in the build dir. On many sys=
tems
> this works, but HP-UX is one of those systems where it does not, so -L =
-l
> are used instead. This can cause problems when an older version of the
> library is installed in $prefix.

Or perhaps the -L shouldn't be added at all automatically, but should
be specified in the Makefile.am file?

For instance, should -L$(top_builddir)/src/.libs be added to AM_LDFLAGS
in tests/Makefile.am?

Since $(AM_LDFLAGS) appears before $(LDFLAGS) in the LINK command,
this should solve the problem. This -L flag would then be used also
on systems that don't need it, but I don't think this is a problem.

--=20
Vincent Lef=E8vre <vincent@HIDDEN> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / Ar=E9naire project (LIP, ENS-Lyon)

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On 10/13/2011 06:54 PM, Vincent Lefevre wrote:
> On 2011-10-13 18:21:35 -0500, Peter O'Gorman wrote:
>> Ok, this is not a libtool bug though. When it can libtool will add the path
>> to the .so instead of -L -l for libraries in the build dir. On many systems
>> this works, but HP-UX is one of those systems where it does not, so -L -l
>> are used instead. This can cause problems when an older version of the
>> library is installed in $prefix.
>
> Or perhaps the -L shouldn't be added at all automatically, but should
> be specified in the Makefile.am file?
>
> For instance, should -L$(top_builddir)/src/.libs be added to AM_LDFLAGS
> in tests/Makefile.am?
>
> Since $(AM_LDFLAGS) appears before $(LDFLAGS) in the LINK command,
> this should solve the problem. This -L flag would then be used also
> on systems that don't need it, but I don't think this is a problem.
>

That might work.

Peter

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On Fri, 14 Oct 2011, Vincent Lefevre wrote:
>> It should be possible for the user to build a package doing
>> ./configure ..options..; make LDFLAGS=-fancyflag
>> CPPFLAGS=-I/want/coffee;
>
> I don't think this should be allowed: MPFR does some tests at
> configure time based on the current environment. If the user
> modifies the environment at make time, the configure tests no
> longer make sense (e.g. modifying LDFLAGS at make time can select
> a different GMP version). So, if the user does this, it is up to

Actually, the user should be allowed to shoot themselves in the foot 
if they request it.  LDFLAGS should be set including the user-provided 
setting during the entire configure run so test results should be 
valid.  I know that MPFR configure does work differently than almost 
any other software package.

Bob
-- 
Bob Friesenhahn
bfriesen@HIDDEN, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

Message sent to bug-libtool@HIDDEN:

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On Fri, 14 Oct 2011, Vincent Lefevre wrote:
>> It should be possible for the user to build a package doing
>> ./configure ..options..; make LDFLAGS=-fancyflag
>> CPPFLAGS=-I/want/coffee;
>
> I don't think this should be allowed: MPFR does some tests at
> configure time based on the current environment. If the user
> modifies the environment at make time, the configure tests no
> longer make sense (e.g. modifying LDFLAGS at make time can select
> a different GMP version). So, if the user does this, it is up to

Actually, the user should be allowed to shoot themselves in the foot 
if they request it.  LDFLAGS should be set including the user-provided 
setting during the entire configure run so test results should be 
valid.  I know that MPFR configure does work differently than almost 
any other software package.

Bob
-- 
Bob Friesenhahn
bfriesen@HIDDEN, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

Message sent to bug-libtool@HIDDEN:

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On 2011-10-13 21:39:56 -0500, Bob Friesenhahn wrote:
> On Fri, 14 Oct 2011, Vincent Lefevre wrote:
> >>It should be possible for the user to build a package doing
> >>./configure ..options..; make LDFLAGS=3D-fancyflag
> >>CPPFLAGS=3D-I/want/coffee;
> >
> >I don't think this should be allowed: MPFR does some tests at
> >configure time based on the current environment. If the user
> >modifies the environment at make time, the configure tests no
> >longer make sense (e.g. modifying LDFLAGS at make time can select
> >a different GMP version). So, if the user does this, it is up to
>=20
> Actually, the user should be allowed to shoot themselves in the foot
> if they request it.

Perhaps, but then, I think that if the user has a good reason to
do this, then it should be able to override the settings done at
configure time. So, --with-gmp=3DDIR should modify LDFLAGS, not
AM_LDFLAGS, because as $(AM_LDFLAGS) appears before $(LDFLAGS),
there would be no way to override a -L flag set in AM_LDFLAGS
by just modifying LDFLAGS.

Note: Mutt also modifies CPPFLAGS / LDFLAGS, not the AM_* versions.

> LDFLAGS should be set including the user-provided setting
> during the entire configure run so test results should be valid.

This is how this works with MPFR.

> I know that MPFR configure does work differently than almost any
> other software package.

I don't know what you mean here. The main difference IMHO, is that
MPFR will try to get the compiler and flags chosen by GMP, but this
is necessary in general (we have much fewer bug reports since we do
this), though quite awkward. And if GMP does something in the user's
back, MPFR shouldn't be blame for trying to fix things.

--=20
Vincent Lef=E8vre <vincent@HIDDEN> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / Ar=E9naire project (LIP, ENS-Lyon)

Message sent to bug-libtool@HIDDEN:

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On 2011-10-13 21:39:56 -0500, Bob Friesenhahn wrote:
> On Fri, 14 Oct 2011, Vincent Lefevre wrote:
> >>It should be possible for the user to build a package doing
> >>./configure ..options..; make LDFLAGS=3D-fancyflag
> >>CPPFLAGS=3D-I/want/coffee;
> >
> >I don't think this should be allowed: MPFR does some tests at
> >configure time based on the current environment. If the user
> >modifies the environment at make time, the configure tests no
> >longer make sense (e.g. modifying LDFLAGS at make time can select
> >a different GMP version). So, if the user does this, it is up to
>=20
> Actually, the user should be allowed to shoot themselves in the foot
> if they request it.

Perhaps, but then, I think that if the user has a good reason to
do this, then it should be able to override the settings done at
configure time. So, --with-gmp=3DDIR should modify LDFLAGS, not
AM_LDFLAGS, because as $(AM_LDFLAGS) appears before $(LDFLAGS),
there would be no way to override a -L flag set in AM_LDFLAGS
by just modifying LDFLAGS.

Note: Mutt also modifies CPPFLAGS / LDFLAGS, not the AM_* versions.

> LDFLAGS should be set including the user-provided setting
> during the entire configure run so test results should be valid.

This is how this works with MPFR.

> I know that MPFR configure does work differently than almost any
> other software package.

I don't know what you mean here. The main difference IMHO, is that
MPFR will try to get the compiler and flags chosen by GMP, but this
is necessary in general (we have much fewer bug reports since we do
this), though quite awkward. And if GMP does something in the user's
back, MPFR shouldn't be blame for trying to fix things.

--=20
Vincent Lef=E8vre <vincent@HIDDEN> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / Ar=E9naire project (LIP, ENS-Lyon)

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On Fri, 14 Oct 2011, Vincent Lefevre wrote:
>>
>> Actually, the user should be allowed to shoot themselves in the foot
>> if they request it.
>
> Perhaps, but then, I think that if the user has a good reason to
> do this, then it should be able to override the settings done at
> configure time. So, --with-gmp=DIR should modify LDFLAGS, not
> AM_LDFLAGS, because as $(AM_LDFLAGS) appears before $(LDFLAGS),
> there would be no way to override a -L flag set in AM_LDFLAGS
> by just modifying LDFLAGS.

It is interesting that Automake decided to do this:

LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
         $(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
         $(AM_LDFLAGS) $(LDFLAGS) -o $@

On one hand I can see that a project needs to take care to ensure that 
components it builds are used in the link.  On the other hand, I can 
see that the user needs a last resort way to influence the library 
search path.  This implies that a package developer should take great 
care to make sure that the content of AM_LDFLAGS will satisfy both 
objectives.

This is an autoconf/automake/package issue rather than a libtool 
issue.

>> I know that MPFR configure does work differently than almost any
>> other software package.
>
> I don't know what you mean here. The main difference IMHO, is that
> MPFR will try to get the compiler and flags chosen by GMP, but this

I stand corrected.  I was blaming the wrong package.  Sorry about 
that.  GMP is one of the few packages which may configure itself (by 
default) for a different architecture than the default architecture of 
the compiler or the architecture that the user requests via CFLAGS. 
It makes this decision based on which architecture offers the best 
performance rather than what the user needs.

Bob
-- 
Bob Friesenhahn
bfriesen@HIDDEN, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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Date: Fri, 14 Oct 2011 08:52:45 -0500 (CDT)
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On Fri, 14 Oct 2011, Vincent Lefevre wrote:
>>
>> Actually, the user should be allowed to shoot themselves in the foot
>> if they request it.
>
> Perhaps, but then, I think that if the user has a good reason to
> do this, then it should be able to override the settings done at
> configure time. So, --with-gmp=DIR should modify LDFLAGS, not
> AM_LDFLAGS, because as $(AM_LDFLAGS) appears before $(LDFLAGS),
> there would be no way to override a -L flag set in AM_LDFLAGS
> by just modifying LDFLAGS.

It is interesting that Automake decided to do this:

LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
         $(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
         $(AM_LDFLAGS) $(LDFLAGS) -o $@

On one hand I can see that a project needs to take care to ensure that 
components it builds are used in the link.  On the other hand, I can 
see that the user needs a last resort way to influence the library 
search path.  This implies that a package developer should take great 
care to make sure that the content of AM_LDFLAGS will satisfy both 
objectives.

This is an autoconf/automake/package issue rather than a libtool 
issue.

>> I know that MPFR configure does work differently than almost any
>> other software package.
>
> I don't know what you mean here. The main difference IMHO, is that
> MPFR will try to get the compiler and flags chosen by GMP, but this

I stand corrected.  I was blaming the wrong package.  Sorry about 
that.  GMP is one of the few packages which may configure itself (by 
default) for a different architecture than the default architecture of 
the compiler or the architecture that the user requests via CFLAGS. 
It makes this decision based on which architecture offers the best 
performance rather than what the user needs.

Bob
-- 
Bob Friesenhahn
bfriesen@HIDDEN, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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