On 08/06/2017 20:26, Ludwig, Mark wrote:
From: Jakob Bohm, Thursday, June 08, 2017 12:32 PM
On 08/06/2017 18:48, Baojun Wang wrote:
Also on Windows (64-bit), openssl produces libssl-1_1-x64.dll as well
as libcrypto-1_1-x64.dll, this could be painful for application who
has to specify openssl dependency, for example now I have to choose
ssl-1_1-x64 and crypto-1_1-x64 as extra-libs, but I imagine there's a
more idiomatic way to make linking on windows (not only 64-bit)
easier, do you have any idea?
Traditionally, Windows (like Unix) uses the same file name for
32 and 64 bits, but puts them in different directories. If
they need to be in the same directory for some applications,
the traditional solution is to insert "32" or "64" on its own,
while still using the same file name for different architectures
with the same bitness. For example a compile for 32 bit MIPS
(supported by older Windows releases) or 32 bit ARM (supported
by newer releases) would have the same name as for 32 bit x86.
Similar for the 4 64 bit architectures supported at various
times (Alpha 64 bit, Itanium, AMD x86_64, 64 bit ARM).
Microsoft did some crazy experiments with a directory scheme
called SxS for versioned DLLs, its badly done and should be
avoided if possible.
The side-by-side (SxS) stuff has its place, but to use it
effectively requires using a "manifest" to identify the
dependencies explicitly. I also don't recommend it for
general use.
Regarding the "32" suffix, you'll see that throughout
Windows itself, on modern 64-bit versions, because the "32"
dates back to the 1990s when Windows was trying to grow out
of being a 16-bit DOS program (WIN.EXE) into a 32-bit
"operating system" (Windows NT). Many people are
misdirected with the term "Win32" into thinking that means
32-bit when it really only means "not 16-bit." Anything
labeled "Win32" could be either 32-bit or 64-bit.
I haven't started working with OpenSSL 1.1.n, but in OpenSSL
1.0.2, all 64-bit builds produce identically-named binaries
such as libeay32.lib and libeay32.dll in the "out32"
directory.
I know, that was (part of) the basis for my answer.
Enjoy
Jakob
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