bneradt commented on issue #7512:
URL: https://github.com/apache/trafficserver/issues/7512#issuecomment-2560211090
When working through test and build updates needed to support fedora:41, I
ran into this Engine deprecation issue when building against fedora:41's system
openssl:
```
[356/1286] Building CXX object
src/iocore/net/CMakeFiles/inknet.dir/SSLUtils.cc.o
FAILED: src/iocore/net/CMakeFiles/inknet.dir/SSLUtils.cc.o
/usr/bin/ccache /usr/lib64/ccache/c++ -DDEBUG -DOPENSSL_API_COMPAT=10002
-DOPENSSL_IS_OPENSSL3 -DPACKAGE_NAME="\"Apache Traffic Server\""
-DPACKAGE_VERSION=\"10.1.0\" -D_DEBUG -Dlinux
-I/home/jenkins/trafficserver/include
-I/home/jenkins/trafficserver/build/include
-I/home/jenkins/trafficserver/lib/swoc/include
-I/home/jenkins/trafficserver/lib/yamlcpp/include -isystem
/home/jenkins/trafficserver/lib/systemtap -pthread -g -std=c++20
-Wno-invalid-offsetof -pipe -Wall -Wextra -Wno-noexcept-type -Wsuggest-override
-Wno-vla-extension -fno-strict-aliasing -Wno-format-truncation
-Wno-deprecated-declarations -mcx16 -Werror -MD -MT
src/iocore/net/CMakeFiles/inknet.dir/SSLUtils.cc.o -MF
src/iocore/net/CMakeFiles/inknet.dir/SSLUtils.cc.o.d -o
src/iocore/net/CMakeFiles/inknet.dir/SSLUtils.cc.o -c
/home/jenkins/trafficserver/src/iocore/net/SSLUtils.cc
/home/jenkins/trafficserver/src/iocore/net/SSLUtils.cc:69:10: fatal error:
openssl/engine.h: No such file or directory
69 | #include <openssl/engine.h>
| ^~~~~~~~~~~~~~~~~~
compilation terminated.
[361/1286] Building CXX object
src/iocore/net/CMakeFiles/inknet.dir/OCSPStapling.cc.o
ninja: build stopped: subcommand failed.
```
This fedora change is described here:
https://discussion.fedoraproject.org/t/f41-change-proposal-openssl-deprecate-engine-system-wide/111344
The `openssl` and `openssl-devel` packages no longer provide engine.h as a
part of fedora:41. They removed it because the engine.h API has been deprecated
since the beginning of OpenSSL 3.0. For the time being to unblock updating CI
to fedora:41, I'll install the `openssl-devel-engine` package for fedora:41.
But it would be good for us to transition off of the deprecated Engine API and
move toward the Provider API per @maskit's suggestion above.
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