Mail Archives: cygwin/2004/07/08/12:00:19
The libtool-devel package contains the 1.5.6 version of libtool, a
cross-platform tool for building libraries (shared and otherwise). It
enables relatively trouble-free builds of DLLs on cygwin and mingw.
Changes from 1.5-3:
o routine update to latest release version
o Includes Gerrit's "expat" fix -- but only the first part of the patch:
http://www.cygwin.com/ml/cygwin/2003-09/msg01559.html
http://www.cygwin.com/ml/cygwin/2003-04/msg01283.html
http://www.cygwin.com/ml/cygwin/2003-04/msg01247.html
o Official libtool NEWS from 1.5.2, 1.5.4, 1.5.6:
* Installs libltdl files properly in $prefix/share/libtool/libltdl.
* libltdl correctly guesses the extension for loadable modules again.
* lt_dlrealloc is an official part of the libltdl API.
* --tag, --silent and --debug options are preserved and reused when
libtool calls itself for relinking etc.
* `-pthread' and similar options are honoured when linking shared
libraries.
* -no-suppress in compile mode shows compiler output for both PIC and
non-PIC object compilation.
* New link mode option `-precious-files-regex' to prevent accidental
removal of files you want to keep, such as test coverage data, from
the temporary output directory.
* Bug fixes.
o see NOTES below, for
NEW FEATURES, KNOWN ISSUES, and SELFTEST FAILURES
==
Chuck
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KNOWN ISSUES:
==================================================================
1) Open issue: pseudo-cross compiler setup doesn't work (e.g. setting
CC='gcc -mno-cygwin' and expecting a mingw output doesn't work, although
it's unclear whether it SHOULD work, even if at some point in the past
it did.) The binary wrapper program hardcodes "/bin/sh" -- which is not
a valid pathname for a -mno-cygwin program. It'd be best to compile the
wrapper with plain "gcc" -- But without making a distincution between
the buildplatform compiler and the hostplatform compiler (e.g. without
using --build= --host=), we can't know about the need for this
distinction. IMO, fixing the "relink .exe ad nauseum" problem is more
important than this corner case -- and there are other ways of
addressing this corner case, which do not involve changes to libtool.
NEW FEATURES:
==================================================================
o adds partial support for including .rc files and using windres
to add resources to executables and libraries. You still must
add something like the following to your Makefile.am file:
LTRCCOMPILE = $(LIBTOOL) --mode=compile $(RC) \
`echo $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) |\
sed -e 's/-I/--include-dir /g;s/-D/--define /g'`
and then explicitly include a build rule:
%.o : %.rc
$(LTRCCOMPILE) -i $@ -o @^
o -export-symbols <a def file> now works properly (it's been broken
for over two years...)
o DESIGN DECISION: (this is a a change from pre-20021111 behavior)
libtool will refuse to create a shared library if any of its
dependencies are available only as static archives. DLLs may
only depend on other DLLs (*)
(*) This is a good idea. But, we need workarounds for the standard
runtime libs like libgcc.a, libstdc++.a, etc. These workarounds are
implemented in this libtool release.
o correctly identifies import libraries as "shared objects", so that
libtool's new "DLLs may only depend on other DLLs" behavior isn't
triggered with fatal results when a target DLL's dependencies are
satisfied by import libs.
o Skips the "DLLs may only depend on other DLLs" check when the
dependency is one of the "standard" runtime libs which are currently
available only in static form (libgcc.a, libstdc++.a, etc) on
cygwin/mingw.
o Isn't "confused" by the libtool .la files supplied with cygwin's gcc,
even though they only specify static archives (e.g. libstdc++.la
lists "libstdc++.a" but not "cygstdc++.dll" [which is good because
cygstdc++.dll doesn't exist]).
o No longer records compiler builtin library paths or compiler-generated
deplibs (like -luser32 -lgcc) in the "dependency_libs" variable in
generated .la files.
SELFTEST FAILURES
=====================================================================
Two selftest failures (longstanding, not regressions)
build-relink2:
-------------------
I fixed one bug, but another showed up: $PATH doesn't
get set properly when running this test...This test
used to get skipped on cygwin, but no longer?
quote:
-------------------
compile mode seems okay
install mode seems okay
link mode *always* fails -- like this:
"failed: mkdir .libs
gcc -o hell.exe -g -O -Wl,-someflag=test foo.o"
?? *mkdir* fails??
But it works fine in compile mode---
"passed: mkdir .libs
gcc -c "-DVAR= test " foo.c -DPIC -o .libs/foo.o
gcc -c "-DVAR= test " foo.c -o foo.o >/dev/null 2>&1"
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