5.4.2 Platform-specific configuration notes
While Libtool tries to hide as many platform-specific features as possible,
some have to be taken into account when configuring either the Libtool package
or a libtoolized package.
- You currently need GNU make to build the Libtool package itself.
- On AIX there are two different styles of shared linking, one where symbols
are bound at link-time and one where symbols are bound at runtime only,
similar to ELF. In case of doubt use
LDFLAGS=-Wl,-brtl for the latter style.
- On AIX, native tools are to be preferred over binutils; especially for C++ code,
if using the AIX Toolbox GCC 4.0 and binutils, configure with
AR=/usr/bin/ar LD=/usr/bin/ld NM='/usr/bin/nm -B'.
- On AIX, the
/bin/sh is very slow due to its inefficient handling
of here-documents. A modern shell is preferable:
CONFIG_SHELL=/bin/bash; export $CONFIG_SHELL
$CONFIG_SHELL ./configure [...]
- For C++ code with templates, it may be necessary to specify the way the compiler
will generate the instantiations. For Portland pgCC version5, use
CXX='pgCC --one_instantiation_per_object' and avoid parallel
- On Darwin, for C++ code with templates you need two level shared libraries.
Libtool builds these by default if
MACOSX_DEPLOYMENT_TARGET is set to
10.3 or later at
configure time. See rdar://problem/4135857
for more information on this issue.
- The default shell on UNICOS 9, a ksh 88e variant, is too buggy to
correctly execute the libtool script. Users are advised to install a
modern shell such as GNU bash.
- Some HP-UX
sed programs are horribly broken, and cannot handle
libtool’s requirements, so users may report unusual problems. There
is no workaround except to install a working
sed (such as GNU sed)
on these systems.
- The vendor-distributed NCR MP-RAS
cc programs emits copyright
on standard error that confuse tests on size of conftest.err. The
workaround is to specify
CC when run configure with
- Any earlier DG/UX system with ELF executables, such as R3.10 or
R4.10, is also likely to work, but hasn’t been explicitly tested.
- On Reliant Unix libtool has only been tested with the Siemens C-compiler
and an old version of
gcc provided by Marco Walther.
- libtool.m4, ltdl.m4 and the configure.ac files are marked
to use autoconf-mode, which is distributed with GNU Emacs 21, Autoconf itself,
and all recent releases of XEmacs.
- When building on some GNU/Linux systems for multilib targets
libtool sometimes guesses the wrong paths that the linker
and dynamic linker search by default. If this occurs, you may override
libtool’s guesses at
configure time by setting the
autoconf cache variables
lt_cv_sys_lib_dlsearch_path_spec respectively to the correct search