How to install on 10.15 with deployment target as 10.13?

[Sandeep Thakkar]

Hi,

I'm compiling postgres with LLVM support on macOS 10.15 Catalina. The
binaries are supported on 10.13+. On target machine (10.13), the library
fails to load with the following error:

*dlopen(/Library/PostgreSQL/13/lib/postgresql/llvmjit.so, 10): Symbol not
found: ____chkstk_darwin*

I guess this is because:
$ otool -l /opt/local/libexec/llvm-8.0/lib/*.dylib | grep -B1 -A3 minos
       sdk 10.15
     minos 10.15

Before I installed LLVM-8.0 using macports on 10.15, I appended
/opt/local/etc/macports/macports.conf file with "macosx_deployment_target
10.13"

and also did "export MACOSX_DEPLOYMENT_TARGET=10.13" on the terminal where
I executed port install clang-8.0


-- 
Sandeep Thakkar
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