Re: MSW DLLs support in libtool

[Evgeny Grin]

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On 12.02.2016 0:14, Nick Bowler wrote:
> On 2/11/16, Evgeny Grin <address@hidden> wrote:
>> * change default shared lib mode from "on" to "auto" or "try" and fail
>> if shared lib cannot be created when mode is "on". With that logic
>> "make" will do what requested instead of guessing that "something may be
>> useful even if not requested". Alternatively - introduce new LT_INIT()
>> flag "no-fallback-to-static".
> 
> This option already exists.  It is called "disable-static".

Actually, no. See:

$ libtool --version
libtool (GNU libtool) 2.4.6
Written by Gordon Matzigkeit, 1996

Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ ../configure --disable-static
checking for a BSD-compatible install... /usr/bin/install -c


checking whether build environment is sane... yes
{skip}
checking whether to build shared libraries... yes


checking whether to build static libraries... no
{skip}

$ make LIBS=-ltdbcstub103
{skip}
/bin/sh ../../libtool  --tag=CC   --mode=link gcc -fvisibility=hidden
- -I/mingw64/include -IT:/msys64/mingw64/include
- -IT:/msys64/mingw64/include/p11-kit-1 -IT:/msys64/mingw64/include -g -O2
- -fno-strict-aliasing -LT:/msys64/mingw64/lib -lgnutls -export-dynamic
- -no-undefined -Wl,--output-def,.libs/libmicrohttpd.def -X CClinker
- -static-libgcc -version-info 48:0:36  -o libmicrohttpd.la -rpath
/usr/local/lib libmicrohttpd_la-connection.lo
libmicrohttpd_la-reason_phrase.lo libmicrohttpd_la-daemon.lo
libmicrohttpd_la-internal.lo libmicrohttpd_la-memorypool.lo
libmicrohttpd_la-mhd_mono_clock.lo libmicrohttpd_la-sysfdsetsize.lo
libmicrohttpd_la-mhd_str.lo libmicrohttpd_la-response.lo
libmicrohttpd_la-postprocessor.lo libmicrohttpd_la-digestauth.lo
libmicrohttpd_la-md5.lo libmicrohttpd_la-basicauth.lo
libmicrohttpd_la-base64.lo libmicrohttpd_la-connection_https.lo
../../src/platform/libplatform_interface.la -LT:/msys64/mingw64/lib
- -lgnutls -L/mingw64/lib -lgcrypt -lgpg-error
libmicrohttpd_la-microhttpd_dll_res.lo -ltdbcstub103

libtool: link: rm -fr  .libs/libmicrohttpd.a .libs/libmicrohttpd.la
.libs/libmicrohttpd.lai




*** Warning: linker path does not have real file for library
- -ltdbcstub103.

*** I have the capability to make that library automatically link in
when

*** you link to this library.  But I can only do this if you have a


*** shared version of the library, which you do not appear to have


*** because I did check the linker path looking for a file starting


*** with libtdbcstub103 and none of the candidates passed a file format
test

*** using a file magic. Last file checked:
T:/msys64/mingw64/lib/libgpg-error.dll.a

*** The inter-library dependencies that have been dropped here will be


*** automatically added whenever a program is linked with this library


*** or is declared to -dlopen it.





*** Since this library must not contain undefined symbols,


*** because either the platform does not support them or


*** it was explicitly requested with -no-undefined,


*** libtool will only create a static version of it.


Even after this bug will be fixed, if project configured with
- --enable-static --enable-shared than "make" must create both static and
shared or fail. Just because I requested both, not some combination up
to libtool choice.

- -- 
Best Wishes,
Evgeny Grin
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