Gentoo Archives: gentoo-devhelp

From: Thomas Kahle <tom111@×××.de>
To: gentoo-devhelp@l.g.o
Subject: Re: [gentoo-devhelp] autotools and as-needed
Date: Wed, 19 Aug 2009 21:04:00
Message-Id: 4A8C6827.1000901@gmx.de
In Reply to: Re: [gentoo-devhelp] autotools and as-needed by Peter Volkov
1 Peter Volkov wrote:
2 > В Срд, 12/08/2009 в 00:03 +0200, Thomas Kahle пишет:
3 >> the following check in configure.ac fails with --as-needed but works
4 >> without it. Any hints what is wrong ? Thanks / Thomas
5 >
6 > Common reason for failure with --as-needed is the order of libraries. In
7 > you previous mail you wrote that with
8 >
9 > sed "s/\"-lntl\"/\"-lntl\" \"-lgf2x -lntl\"/" -i "${S}/configure.ac"
10 >
11 > it works but here:
12 >
13 >> for lib in "" "-lntl" "-lntl -lgf2x"
14 >
15 > I see different order. Try to change order of -lgf2x and -lntl inside
16 > ebuild. Also
17
18 This change of order is actually since I tried what you suggested. I
19 find that this check fails just because the compile fails. It has
20 nothing to do with configure. So here is my problem stripped down:
21
22 $cat ntlcheck.c
23 #include <NTL/tools.h>
24 int main () { _ntl_GetTime(); }
25
26 g++ ntlcheck.c -lntl -lgf2x
27 works
28
29 $g++ -Wl,--as-needed ntlcheck.c -lntl -lgf2x
30 /usr/lib/gcc/i686-pc-linux-gnu/4.3.2/../../../libntl.so: undefined
31 reference to `gf2x_mul'
32 collect2: ld returned 1 exit status
33
34 $ g++ -Wl,--as-needed ntlcheck.c -lgf2x -lntl
35 /usr/lib/gcc/i686-pc-linux-gnu/4.3.2/../../../libntl.so: undefined
36 reference to `gf2x_mul'
37 collect2: ld returned 1 exit status
38
39 BTW, installing ntl without gf2x support makes
40 $g++ -Wl,--as-needed ntlcheck.c -lntl
41 work !
42
43 It feels like it has something to do with ntl-headers having gf2x includes.
44
45 > sed 's/"-lntl"/"-lntl" "-lgf2x -lntl"/' -i "${S}/configure.ac"
46 good point. No need to escape the ' " ' :)
47
48 thanks
49 Thomas
50
51
52
53 --
54 Thomas Kahle
55
56 The fundamental theorem of algebra is open source. Like any other
57 mathematical theorem it can be applied free of charge and everybody
58 has access to its proof and can convince himself how it works. Why
59 should software be any different?

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Re: [gentoo-devhelp] autotools and as-needed Mike Frysinger <vapier@g.o>