[GitHub] [pulsar-client-cpp] BewareMyPower commented on pull request #31: Link to OpenSSL statically when LINK_STATIC is ON

[GitBox <gi...@apache.org>]

BewareMyPower commented on PR #31:
URL: https://github.com/apache/pulsar-client-cpp/pull/31#issuecomment-1272600120

   After this PR, here are examples about how do I build an application with the given three libraries on macOS. Assume they are built with `LINK_STATIC=ON` option. It's a little tricky to build the static library of libcurl, see my comments here: https://github.com/apache/pulsar/issues/4967#issuecomment-1272440827
   
   Given such an application code (`example.cc`):
   
   ```c++
   #include <pulsar/Client.h>
   using namespace pulsar;
   
   int main() {
       Client client("pulsar://localhost:6650");
       client.close();
   }
   ```
   
   Assuming the headers are under `include/` directory and the libraries are under `lib/` directory, which is not a system path.
   
   ### libpulsar.so
   
   Build:
   
   ```bash
   clang++ example.cc -I include/ -L lib/ -lpulsar
   ```
   
   Run:
   
   ```bash
   # You have to add the path of `libpulsar.dylib` to a specific env variable so that symbols can be found
   DYLD_LIBRARY_PATH=$PWD/lib ./a.out
   ```
   
   ### libpulsar.a
   
   Build:
   
   ```bash
   # You have to link all 3rd party dependencies.
   # BTW, the directory followed by `-L` might be different in your actual env.
   clang++ example.cc -I include/ 
   lib/libpulsar.a \
   -lcurl -lz -lzstd \
   -L /usr/local/opt/protobuf/lib/ -lprotobuf \
   -L /usr/local/opt/openssl@3/lib/ -lssl -lcrypto \
   -L /usr/local/opt/snappy/lib/ -lsnappy
   ```
   
   Run:
   
   ```bash
   ./a.out
   ```
   
   ### libpulsarwithdeps.a
   
   Build:
   
   ```bash
   # NOTE: these -framework options are required by curl.a and only needed on macOS 
   clang++ example.cc lib/libpulsarwithdeps.a -framework SystemConfiguration -framework CoreFoundation
   ```
   
   Run:
   
   ```bash
   ./a.out
   ```


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