Re: MSW DLLs support in libtool

[Evgeny Grin]

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On 12.02.2016 0:53, Bob Friesenhahn wrote:
> On Thu, 11 Feb 2016, Evgeny Grin wrote:
>> On 10.02.2016 18:51, Nick Bowler wrote:
>>> The default (on all platforms) is to create both static libraries and,
>>> when possible, shared libraries.
>> This statement is ether not correct or incorrectly documented.
>> Currently "configure --help" show those lib options by default:
>>  --enable-shared[=PKGS]  build shared libraries [default=yes]
>>  --enable-static[=PKGS]  build static libraries [default=yes]
>>
>> There is not "=auto" option for shared or static versions. Only "yes" or
>> "no".
>> So, it's explicitly specified whether static will be created and whether
>> shared will be created. So "make" must ether create requested versions
>> or fail.
> 
> These are 'enable' options.  Use of 'enable' implies "best effort".
'enable' also implies 'produce result or fail is result is not possible'.
For example, if GCC is configured with "--enable-tls" than TLS will be
enabled or GCC will not be built. Same for any other "enable" option. If
something is enabled, than enabled option must be present in result if
"make" finished without an error, no matter what is printed during building.
Currently "--enable-shared" is the *ONLY* exception. It contradicts all
other options.

If some package cannot be built as shared library, than libtool can
print recommendation to try to rebuild it as static library. As package
must be rebuild as static.
Currently libtool is not helping at this moment. Instead, libtool makes
building more difficult is it hiding real errors.
A simple example: you are building a set of 20 depend libs for some
application (I'm working on Kodi (ex-XBMC) and it's a normal process for
release). Libs have inter-dependencies and build up in specific order.
If one of the first lib was accidentally failed to build as shared than
all dependent libs was not build as shared too. And this will not be
detected in the middle of process as "make" succeed. Libtool hides the
failure and time of long process of creating all lib chain was wasted.

- -- 
Best Wishes,
Evgeny Grin
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