Re: MSW DLLs support in libtool

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On 11.02.2016 11:03, Peter Rosin wrote:
> Well said, I would also like to add that libtool -no-undefined *does* *not*
> imply ld --no-undefined. I.e. If you add libtool -no-undefined, then the
> *only* thing that changes is that libtool actually attempts the shared
> build.
Libtool must attempt to build shared version if configured with
"--enable-shared" and must not attempt to build it if configured with
"--disable-shared". It's up to linker to fail if shared build is not
possible. "Configure" job is to resolve everything that required.
On W32 this sounds like "-linker-will-not-fail". Why make any
predictions or assumptions if it possible to just try to link?

> Conditionally adding -no-undefined for systems where it matters is overly
> defensive.
Not agree.
Let's consider that some dev is working on porting some lib to W32 (or
AIX). Lib is already ported to
Linux/Darwin/FreeBSD/OpenBSD/NetBSD/Solaris/HP-UX. And usually some
ports contain OS-specific code parts. This developer need to add
"-no-undefined" flag for new port. There are two choices: add flag
unconditionally and test lib under all OSes (better - with all possible
options and on different OS versions) or just conditionally add flag for
specific OS. I bet which way will be chosen.

Repeat once more: with OS-specific code parts you can't add
"-no-undefined" unconditionally.

- -- 
Best Wishes,
Evgeny Grin
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