GNU bug report logs -
#38610
Two libtool 2.4.6 issues
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Reported by: Sergey Poznyakoff <gray <at> gnu.org>
Date: Sat, 14 Dec 2019 11:24:01 UTC
Severity: normal
Done: Ileana Dumitrescu <ileanadumitrescu95 <at> gmail.com>
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Report forwarded
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bug-libtool <at> gnu.org
:
bug#38610
; Package
libtool
.
(Sat, 14 Dec 2019 11:24:01 GMT)
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Acknowledgement sent
to
Sergey Poznyakoff <gray <at> gnu.org>
:
New bug report received and forwarded. Copy sent to
bug-libtool <at> gnu.org
.
(Sat, 14 Dec 2019 11:24:01 GMT)
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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
Dear maintainers,
When working on GNU mailutils we have discovered two issues with libtool,
which probably qualify as bugs.
Issue 1:
Imagine a project consisting of at least one installable shared
library (libltb1) and an installable binary program (ltb1), which is
linked with that library. If the ltb1_LDFLAGS variable contains one
or more -Wl,-rpath linker options, the created wrapper script will
prefer directories listed in them over locations in the build tree. If
a previous version of the libltb1 library is already installed in one
of these directories, the ltb1 wrapper will use the installed version
of the library, instead of the one from the source tree. This leads to
undesirable consequences, e.g. if the package provides a test suite,
it will likely fail, since it will be using wrong library version.
This issue is described in detail here:
http://gray.gnu.org.ua/public/ltbug/#ltb1
The test case is available for download from:
http://gray.gnu.org.ua/public/ltbug/ltbug-1.tar.gz
(to test, unpack the archive and run 'sh ltbug-1/test.sh')
The proposed patch is available from:
http://gray.gnu.org.ua/public/ltbug/0001-ltmain.in-append-rpath-option-arguments-to-finalize_.patch
Issue 2:
Imagine a project consisting of two installable libraries (liba, and
libb) and a binary (ltb2) linked to both of them. Let liba depend on an
external library, which has a libtool archive installed along with the
shared library. This archive obviously contains the libdir variable
pointing to its installation directory (let's name it D). Then, the
wrapper script for ltb2 is created in such a way, that liba is searched
in the source tree, but the libb is searched first in D and then in the
source tree. If a prior version of the project is installed in the same
prefix as the libdep library, then the ltb2 wrapper will use the version
of liba from the local source tree, but the version of libb installed on
the system.
This issue is described in detail in:
http://gray.gnu.org.ua/public/ltbug/#ltb2
The test case is available for download from:
http://gray.gnu.org.ua/public/ltbug/ltbug-2.tar.gz
(to test, unpack the archive and run 'sh ltbug-2/test.sh')
The proposed patch is available here:
http://gray.gnu.org.ua/public/ltbug/0002-ltmain.in-ensure-that-local-source-tree-directories-.patch
Both issues were confirmed to exist on GNU/Linux and on FreeBSD. See
http://gray.gnu.org.ua/public/ltbug#affected-systems for a complete list
list. Both libtool 2.4.6 and the development version from git HEAD
were tested.
Best regards,
Sergey
Information forwarded
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bug-libtool <at> gnu.org
:
bug#38610
; Package
libtool
.
(Sun, 15 Dec 2019 10:04:01 GMT)
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Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):
Hello,
Sergey Poznyakoff wrote:
> Dear maintainers,
>
> When working on GNU mailutils we have discovered two issues with libtool,
> which probably qualify as bugs.
> [SNIP]
Build with installed library into non-default locations most of the time
is painful.
In one of models each library set(package) is installed in separate
directory in format like this: <install>/<package>-<version>.
This model prevents load of headers and library from unexpected location
but build use many -I and -L flags. Let skip -R/-rpath flags for simplify.
Another model is installation in common path. In this case flags are
less but build is more tricky - user must ensure precedence of headers
(-I) and libraries (-L) from source tree.
So report is for libtool and samples are for libraries but case is
applicable for header files as well. And for headers we cannot blame
libtool.
Tips:
I prefer first model but in one case I use second.
Let headers are in <INSTALL>/include and libraries are in <INSTALL>/lib
In the second with limited number of projects:
- if build uses shell script to return path to headers and libraries
script must be modified do not output -I and -L flags.
- if build uses pkgconfig environment must be set so that command do not
output -I and -L flags.
- libtool is tuned with new "system library path" : variable
lt_cv_sys_lib_dlsearch_path_spec, work fine on unixes.
- CC is overridden to use flags like --sysroot, -isystem, -B and etc.
Unfortunately clang lack flag to add item to "system library search
path" and so gcc is preferred.
Remark:
In one of the provided samples is hard coded path -L $(libdir), i.e.
-L<path> -l<lib> This should be $(FOO_LIBS) and depending from model at
configuration time is should be set either to -L<path> -l<lib> or only
to -l<lib>. First is usable for model with separate directories
otherwise should be used second one.
Regards,
Roumen Petrov
P.S. samples:
$ pkg-config --libs openssl
-lssl -lcrypto
$ PKG_CONFIG_SYSTEM_LIBRARY_PATH=/bon/go pkg-config --libs openssl
-L/usr/lib64 -lssl -lcrypto
So with PKG_CONFIG_* environment variables build could be tuned to
exclude -I and -L flags.
Note pkg-config flags lib-only* and cflags-only* are out of scope.
Information forwarded
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bug-libtool <at> gnu.org
:
bug#38610
; Package
libtool
.
(Sun, 15 Dec 2019 10:04:02 GMT)
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Information forwarded
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bug-libtool <at> gnu.org
:
bug#38610
; Package
libtool
.
(Sun, 15 Dec 2019 18:12:02 GMT)
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Message #14 received at 38610 <at> debbugs.gnu.org (full text, mbox):
Hi Roumen,
Roumen Petrov <bugtrack <at> roumenpetrov.info> ha escrit:
> Build with installed library into non-default locations
There's no question about non-default locations. In real life examples,
all locations are system defaults.
> most of the time is painful.
And one of the purposes of libtool is to make it less painful. That's
why I took the trouble to write a report.
> So report is for libtool and samples are for libraries but case is
> applicable for header files as well.
Header files are completely irrelevant here. Both issues clearly
demonstrate that the problem is related to shared objects only,
explain why, and propose the ways to fix.
> Remark:
> In one of the provided samples is hard coded path -L $(libdir),
> i.e. -L<path> -l<lib>
Yes, and a rationale for it is provided.
> This should be $(FOO_LIBS) and depending from
This would imply parsing the output from krb5-config and splitting it
into _LIBS and _LDFLAGS related parts. That was attempted as well, but
did not alleviate the problem in any way.
> $ pkg-config --libs openssl
Thanks, but pkg-config is not used at all.
Regards,
Sergey
Information forwarded
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bug-libtool <at> gnu.org
:
bug#38610
; Package
libtool
.
(Sun, 15 Dec 2019 18:13:01 GMT)
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Reply sent
to
Ileana Dumitrescu <ileanadumitrescu95 <at> gmail.com>
:
You have taken responsibility.
(Wed, 25 Sep 2024 18:10:02 GMT)
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Notification sent
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Sergey Poznyakoff <gray <at> gnu.org>
:
bug acknowledged by developer.
(Wed, 25 Sep 2024 18:10:02 GMT)
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Message #22 received at 38610-done <at> debbugs.gnu.org (full text, mbox):
[Message part 1 (text/plain, inline)]
Closing duplicate of 71489 [1].
[1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=71489
--
Ileana Dumitrescu
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bug archived.
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internal_control <at> debbugs.gnu.org
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(Thu, 24 Oct 2024 11:24:08 GMT)
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This bug report was last modified 34 days ago.
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