On Wed, Jun 21, 2017 at 01:44:34PM -0400, Ken Goldman wrote:
> This is probably Linux specific ...
>
> Can both openssl versions co-exist on the same platform. I know that the
> .so is versioned, but how about the header files? Can I choose which
> library to build with?
Yes, with care. I support systems where the base platform (debian)
provides OpenSSL 1.0.1 in /usr/{include,lib,bin}, and I additionally
deploy OpenSSL 1.0.2 and OpenSSL 1.1.0 in:
/opt/openssl/1.0/{include,lib,bin} OpenSSL 1.0.2
/opt/openssl/1.1/{include,lib,bin} OpenSSL 1.1.0
These builds employ custom ELF symbol versions and custom ELF
SONAMEs, and custom RPATHs, so that they can coexist without conflict
in a single running process with the system OpenSSL library.
Applications that use my builds can then be compiled with (for
example):
-I/opt/openssl/1.1/include \
-L/opt/openssl/1.1/lib \
-Wl,-R,/opt/openssl/1.1/lib
> Do the headers go in the same /usr/include/openssl or are there links?
>
> Are there ifdefs in the header files.
>
> Is there a FAQ covering this?
Not that I've seen.
--
Viktor.
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