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08279564ff
Revert 8728e07 and 440fee6.
Some GNU/Linux distributions install libraries into /lib64 (or
/usr/lib64) on 64-bit machines, while /lib (/usr/lib
respectively) stays for multilib variant. Other distributions
keep /usr/lib for 64-bit variant and reserve other directory for
multilib. Detection of what approach a given system uses is
difficult, however, especially because Glibc's ldconfig does not
report the full and correct list of search paths. Allow the user
to adjust Libtools heuristically determined search paths with
the new LT_SYS_LIBRARY_PATH environment variable at both
compile-time, when libtool is called, and at configure time.
* m4/libtool.m4 (_LT_PREPARE_MUNGE_PATH_LIST): Define a new
function to munge a libtool path list according to a user
supplied colon-delimited path.
(_LT_SYS_DYNAMIC_LINKER): Require _LT_PREPARE_MUNGE_PATH_LIST.
Mark LT_SYS_LIBRARY_PATH as precious to autoconf (to survive
automatic "autoreconf").
Call the new func_munge_path_list function on
sys_lib_dlsearch_path_spec - this propagates results to
generated libtool script.
(_LT_CONFIG): Expand _LT_PREPARE_MUNGE_PATH_LIST into generated
libtool script.
* build-aux/ltmain.in (func_mode_link): Call it to adjust
sys_lib_dlsearch_path according to LT_SYS_LIBRARY_PATH.
* doc/libtool.texi: Document new LT_SYS_LIBRARY_PATH.
* doc/notes.texi: Likewise.
* NEWS: Update.
References: http://thread.gmane.org/gmane.comp.gnu.libtool.general/8339/focus=8345
Signed-off-by: Gary V. Vaughan <gary@gnu.org>
80 lines
3.1 KiB
Plaintext
80 lines
3.1 KiB
Plaintext
@itemize
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@item
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You currently need GNU make to build the Libtool package itself.
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@item
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On AIX there are two different styles of shared linking, one where symbols
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are bound at link-time and one where symbols are bound at runtime only,
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similar to ELF@. In case of doubt use @code{LDFLAGS=-Wl,-brtl} for the latter style.
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@item
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On AIX, native tools are to be preferred over binutils; especially for C++ code,
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if using the AIX Toolbox GCC 4.0 and binutils, configure with
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@code{AR=/usr/bin/ar LD=/usr/bin/ld NM='/usr/bin/nm -B'}.
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@item
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On AIX, the @command{/bin/sh} is very slow due to its inefficient handling
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of here-documents. A modern shell is preferable:
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@example
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CONFIG_SHELL=/bin/bash; export $CONFIG_SHELL
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$CONFIG_SHELL ./configure [...]
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@end example
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@item
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For C++ code with templates, it may be necessary to specify the way the compiler
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will generate the instantiations. For Portland pgCC version5, use
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@code{CXX='pgCC --one_instantiation_per_object'} and avoid parallel @command{make}.
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@item
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On Darwin, for C++ code with templates you need two level shared libraries.
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Libtool builds these by default if @env{MACOSX_DEPLOYMENT_TARGET} is set to
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10.3 or later at @command{configure} time. See @url{rdar://problem/4135857}
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for more information on this issue.
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@c @item
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@c FreeBSD @command{make} does not conform to @sc{posix} in its handling
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@c of file modification times, which causes it to loop while building libtool.
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@c Consider using a different @command{such} as GNU make instead.
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@item
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The default shell on UNICOS 9, a ksh 88e variant, is too buggy to
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correctly execute the libtool script. Users are advised to install a
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modern shell such as GNU bash.
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@item
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Some HP-UX @command{sed} programs are horribly broken, and cannot handle
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libtool's requirements, so users may report unusual problems. There
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is no workaround except to install a working @command{sed} (such as GNU sed)
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on these systems.
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@item
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The vendor-distributed NCR MP-RAS @command{cc} programs emits copyright
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on standard error that confuse tests on size of @file{conftest.err}. The
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workaround is to specify @env{CC} when run configure with
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@code{CC='cc -Hnocopyr'}.
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@item
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Any earlier DG/UX system with ELF executables, such as R3.10 or
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R4.10, is also likely to work, but hasn't been explicitly tested.
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@item
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On Reliant Unix libtool has only been tested with the Siemens C-compiler
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and an old version of @command{gcc} provided by Marco Walther.
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@item
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@file{libtool.m4}, @file{ltdl.m4} and the @file{configure.ac} files are marked
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to use autoconf-mode, which is distributed with GNU Emacs 21, Autoconf itself,
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and all recent releases of XEmacs.
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@item
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When building on some GNU/Linux systems for multilib targets @command{libtool}
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sometimes guesses the wrong paths that the linker and dynamic linker search by
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default. If this occurs for the dynamic library path, you may use the
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@code{LT_SYS_LIBRARY_PATH} environment variable to adjust. Otherwise, at
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@command{configure} time you may override libtool's guesses by setting the
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@command{autoconf} cache variables @code{lt_cv_sys_lib_search_path_spec} and
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@code{lt_cv_sys_lib_dlsearch_path_spec} respectively.
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@end itemize
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