How to switch between OpenSSL 1.0.2 and 1.1 in compilation loading and linking a C code.

[Floodeenjr, Thomas]

You may need to rename the libraries on your system or use LD_PRELOAD when launching your application.

Another option is to specify the full path to the specific libraries you want when you link with, instead of the -l<library_name>.

For example:
gcc -I /sonus/p4/ws/shared/cmn_thirdparty.main/openssl/distrib/include -L /sonus/p4/ws/shared/cmn_thirdparty.main/bldtools/toolchain/current/sonus/lib/ <PATH_TO>/libssl.so.1.0.2 <PATH_TO>/libcrypto.so.1.0.2 cpxmain1.c -o cpxmain1

-Tom

From: openssl-users <openssl-users-bounces at openssl.org> On Behalf Of Kumar Mishra, Sanjeev
Sent: Thursday, May 6, 2021 12:48 AM
To: openssl-users at openssl.org
Cc: Paramashivaiah, Sunil <Sunil.Paramashivaiah at rbbn.com>; Narayana, Sunil Kumar <sanarayana at rbbn.com>; Bhattacharjee, Debapriyo (c) <dbhattacharjee at rbbn.com>; Shivakumar Poojari <Shivakumar.Poojari at rbbn.com>
Subject: How to switch between OpenSSL 1.0.2 and 1.1 in compilation loading and linking a C code.

Hi,
In my Linux Debian server both OpenSSL 1.0.2 and 1.1 is installed. As a user I am compiling C code for 1.0.2. But at the runtime and linking and loading it is picking version 1.1 as default. How to switch between OpenSSL 1.0.2 and 1.1 in compilation loading and linking a C code ? Is there any linux env is required to set? I am using following commands-

export LD_LIBRARY_PATH=/sonus/p4/ws/shared/cmn_thirdparty.main/bldtools/toolchain/current/sonus/lib/
To compile
gcc -I /sonus/p4/ws/shared/cmn_thirdparty.main/openssl/distrib/include -L /sonus/p4/ws/shared/cmn_thirdparty.main/bldtools/toolchain/current/sonus/lib/ -lssl -lcrypto cpxmain1.c -o cpxmain1


Both the libcrypto.so.1.0.2 and  libcrypto.so.1.1 is present in this path but only picking 1.1 as a default. How to change this default setting?

Thanks With Best Regards,
Sanjeev Kumar Mishra



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