[gentoo-devhelp] autotools and as-needed

[gentoo-devhelp] autotools and as-needed

[Thomas Kahle]

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Hi,
the following check in configure.ac fails with --as-needed but works
without it. Any hints what is wrong ? Thanks / Thomas

--------------------

if test $BUILD_ntl = no
then AC_LANG(C++)
     AC_CHECK_HEADER(NTL/version.h,,BUILD_ntl=yes)
     AC_MSG_CHECKING(for ntl library)
     FOUND=
     SAVELIBS=$LIBS
     for lib in "" "-lntl" "-lntl -lgf2x"
     do  test "$lib" && LIBS="$lib $LIBS"
	 AC_LINK_IFELSE( [
		 #include <NTL/tools.h>
		 int main () { _ntl_GetTime(); }
		 ],
	     FOUND=yes; break;,
	     LIBS=$SAVELIBS)
     done
     if test "$FOUND"
     then if test "$lib"
	 then AC_MSG_RESULT([$lib])
	 else AC_MSG_RESULT([none needed])
	 fi
     else AC_MSG_RESULT(none found)
	 BUILD_ntl=yes
     fi
fi


-- 
Thomas Kahle

The fundamental theorem of algebra is open source. Like any other
mathematical theorem it can be applied free of charge and everybody
has access to its proof and can convince himself how it works. Why
should software be any different?


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Re: [gentoo-devhelp] autotools and as-needed

[Justin]

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Thomas Kahle schrieb:
> Hi,
> the following check in configure.ac fails with --as-needed but works
> without it. Any hints what is wrong ? Thanks / Thomas
> 
> --------------------
> 
> if test $BUILD_ntl = no
> then AC_LANG(C++)
>      AC_CHECK_HEADER(NTL/version.h,,BUILD_ntl=yes)
>      AC_MSG_CHECKING(for ntl library)
>      FOUND=
>      SAVELIBS=$LIBS
>      for lib in "" "-lntl" "-lntl -lgf2x"
>      do  test "$lib" && LIBS="$lib $LIBS"
> 	 AC_LINK_IFELSE( [
> 		 #include <NTL/tools.h>
> 		 int main () { _ntl_GetTime(); }
> 		 ],
> 	     FOUND=yes; break;,
> 	     LIBS=$SAVELIBS)
>      done
>      if test "$FOUND"
>      then if test "$lib"
> 	 then AC_MSG_RESULT([$lib])
> 	 else AC_MSG_RESULT([none needed])
> 	 fi
>      else AC_MSG_RESULT(none found)
> 	 BUILD_ntl=yes
>      fi
> fi
> 
> 

Perhaps you will find a hint in Diego's blog. I think he wrote about
configure checks which fail with as-needed and how to fix them.

justin


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Re: [gentoo-devhelp] autotools and as-needed

[Mike Frysinger]

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On Tuesday 11 August 2009 18:03:24 Thomas Kahle wrote:
> the following check in configure.ac fails with --as-needed but works
> without it. Any hints what is wrong ?

the config.log snippets for these tests would be helpful
-mike

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Re: [gentoo-devhelp] autotools and as-needed

[Justin]

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there is also this thread from Betelgeuse:


http://www.opensubscriber.com/message/libtool@gnu.org/8701479.html


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Re: [gentoo-devhelp] autotools and as-needed

[Peter Volkov]

В Срд, 12/08/2009 в 00:03 +0200, Thomas Kahle пишет:
> the following check in configure.ac fails with --as-needed but works
> without it. Any hints what is wrong ? Thanks / Thomas

Common reason for failure with --as-needed is the order of libraries. In
you previous mail you wrote that with 

sed "s/\"-lntl\"/\"-lntl\" \"-lgf2x -lntl\"/" -i "${S}/configure.ac"

it works but here: 

> for lib in "" "-lntl" "-lntl -lgf2x"

I see different order. Try to change order of -lgf2x and -lntl inside
ebuild. Also 

sed 's/"-lntl"/"-lntl" "-lgf2x -lntl"/' -i "${S}/configure.ac"

is shorter and easier to read.

-- 
Peter.

Re: [gentoo-devhelp] autotools and as-needed

[Thomas Kahle]

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Peter Volkov wrote:
> В Срд, 12/08/2009 в 00:03 +0200, Thomas Kahle пишет:
>> the following check in configure.ac fails with --as-needed but works
>> without it. Any hints what is wrong ? Thanks / Thomas
> 
> Common reason for failure with --as-needed is the order of libraries. In
> you previous mail you wrote that with 
> 
> sed "s/\"-lntl\"/\"-lntl\" \"-lgf2x -lntl\"/" -i "${S}/configure.ac"
> 
> it works but here: 
> 
>> for lib in "" "-lntl" "-lntl -lgf2x"
> 
> I see different order. Try to change order of -lgf2x and -lntl inside
> ebuild. Also 

This change of order is actually since I tried what you suggested. I
find that this check fails just because the compile fails. It has
nothing to do with configure. So here is my problem stripped down:

$cat ntlcheck.c
#include <NTL/tools.h>
int main () { _ntl_GetTime(); }

g++ ntlcheck.c -lntl -lgf2x
works

$g++ -Wl,--as-needed ntlcheck.c -lntl -lgf2x
/usr/lib/gcc/i686-pc-linux-gnu/4.3.2/../../../libntl.so: undefined
reference to `gf2x_mul'
collect2: ld returned 1 exit status

$ g++ -Wl,--as-needed ntlcheck.c -lgf2x -lntl
/usr/lib/gcc/i686-pc-linux-gnu/4.3.2/../../../libntl.so: undefined
reference to `gf2x_mul'
collect2: ld returned 1 exit status

BTW, installing ntl without gf2x support makes
$g++ -Wl,--as-needed ntlcheck.c -lntl
work !

It feels like it has something to do with ntl-headers having gf2x includes.

> sed 's/"-lntl"/"-lntl" "-lgf2x -lntl"/' -i "${S}/configure.ac"
good point. No need to escape the ' " ' :)

thanks
Thomas



-- 
Thomas Kahle

The fundamental theorem of algebra is open source. Like any other
mathematical theorem it can be applied free of charge and everybody
has access to its proof and can convince himself how it works. Why
should software be any different?


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Re: [gentoo-devhelp] autotools and as-needed

[Thomas Kahle]

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Mike Frysinger wrote:
> On Tuesday 11 August 2009 18:03:24 Thomas Kahle wrote:
>> the following check in configure.ac fails with --as-needed but works
>> without it. Any hints what is wrong ?
> 
> the config.log snippets for these tests would be helpful

linking of the small test file fails. Please see my reply to peter
volkovs mail.

thanks
Thomas



> -mike


-- 
Thomas Kahle

The fundamental theorem of algebra is open source. Like any other
mathematical theorem it can be applied free of charge and everybody
has access to its proof and can convince himself how it works. Why
should software be any different?


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Re: [gentoo-devhelp] autotools and as-needed

[Mike Frysinger]

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On Wednesday 19 August 2009 17:01:27 Thomas Kahle wrote:
> Peter Volkov wrote:
> > В Срд, 12/08/2009 в 00:03 +0200, Thomas Kahle пишет:
> >> the following check in configure.ac fails with --as-needed but works
> >> without it. Any hints what is wrong ? Thanks / Thomas
> >
> > Common reason for failure with --as-needed is the order of libraries. In
> > you previous mail you wrote that with
> >
> > sed "s/\"-lntl\"/\"-lntl\" \"-lgf2x -lntl\"/" -i "${S}/configure.ac"
> >
> > it works but here:
> >> for lib in "" "-lntl" "-lntl -lgf2x"
> >
> > I see different order. Try to change order of -lgf2x and -lntl inside
> > ebuild. Also
>
> This change of order is actually since I tried what you suggested. I
> find that this check fails just because the compile fails. It has
> nothing to do with configure. So here is my problem stripped down:
>
> $cat ntlcheck.c
> #include <NTL/tools.h>
> int main () { _ntl_GetTime(); }
>
> g++ ntlcheck.c -lntl -lgf2x
> works

this is a bug in libntl.so.  it uses gf2x symbols but doesnt link against it 
in libntl.so.  you shouldnt have to also link against libgf2x.so.
-mike

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Re: [gentoo-devhelp] autotools and as-needed

[Thomas Kahle]

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Mike Frysinger wrote:
> On Wednesday 19 August 2009 17:01:27 Thomas Kahle wrote:
>> Peter Volkov wrote:
>>> В Срд, 12/08/2009 в 00:03 +0200, Thomas Kahle пишет:
>>>> the following check in configure.ac fails with --as-needed but works
>>>> without it. Any hints what is wrong ? Thanks / Thomas
>>> Common reason for failure with --as-needed is the order of libraries. In
>>> you previous mail you wrote that with
>>>
>>> sed "s/\"-lntl\"/\"-lntl\" \"-lgf2x -lntl\"/" -i "${S}/configure.ac"
>>>
>>> it works but here:
>>>> for lib in "" "-lntl" "-lntl -lgf2x"
>>> I see different order. Try to change order of -lgf2x and -lntl inside
>>> ebuild. Also
>> This change of order is actually since I tried what you suggested. I
>> find that this check fails just because the compile fails. It has
>> nothing to do with configure. So here is my problem stripped down:
>>
>> $cat ntlcheck.c
>> #include <NTL/tools.h>
>> int main () { _ntl_GetTime(); }
>>
>> g++ ntlcheck.c -lntl -lgf2x
>> works
> 
> this is a bug in libntl.so.  it uses gf2x symbols but doesnt link against it 
> in libntl.so.  you shouldnt have to also link against libgf2x.so.
> -mike

Thanks => bug #282174

Thomas


-- 
Thomas Kahle

The fundamental theorem of algebra is open source. Like any other
mathematical theorem it can be applied free of charge and everybody
has access to its proof and can convince himself how it works. Why
should software be any different?




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Re: [gentoo-devhelp] autotools and as-needed

[Mike Frysinger]

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On Friday 21 August 2009 03:48:27 Thomas Kahle wrote:
> Mike Frysinger wrote:
> > On Wednesday 19 August 2009 17:01:27 Thomas Kahle wrote:
> >> Peter Volkov wrote:
> >>> В Срд, 12/08/2009 в 00:03 +0200, Thomas Kahle пишет:
> >>>> the following check in configure.ac fails with --as-needed but works
> >>>> without it. Any hints what is wrong ? Thanks / Thomas
> >>>
> >>> Common reason for failure with --as-needed is the order of libraries.
> >>> In you previous mail you wrote that with
> >>>
> >>> sed "s/\"-lntl\"/\"-lntl\" \"-lgf2x -lntl\"/" -i "${S}/configure.ac"
> >>>
> >>> it works but here:
> >>>> for lib in "" "-lntl" "-lntl -lgf2x"
> >>>
> >>> I see different order. Try to change order of -lgf2x and -lntl inside
> >>> ebuild. Also
> >>
> >> This change of order is actually since I tried what you suggested. I
> >> find that this check fails just because the compile fails. It has
> >> nothing to do with configure. So here is my problem stripped down:
> >>
> >> $cat ntlcheck.c
> >> #include <NTL/tools.h>
> >> int main () { _ntl_GetTime(); }
> >>
> >> g++ ntlcheck.c -lntl -lgf2x
> >> works
> >
> > this is a bug in libntl.so.  it uses gf2x symbols but doesnt link against
> > it in libntl.so.  you shouldnt have to also link against libgf2x.so.
>
> Thanks => bug #282174

i'm not suggesting this will fix your original problem btw.  you might want to 
test to see if it does.
-mike

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