Fixes to build scripts to generate pjrt_c_api_cpu_plugin.o under /usr…

…/local/lib as well.

README.md

@@ -208,7 +208,12 @@ For Linux (or Windows+WSL)+CUDA (NVidia GPU) support, in addition also run ([see
 curl -sSf https://raw.githubusercontent.com/gomlx/gopjrt/main/cmd/install_cuda.sh | bash
 ```
 
-* ** 🚧🛠️ Mac (Darwin) support currently broken  🛠🚧️**: follow discussion in [XLA's issue #19152](https://github.com/openxla/xla/issues/19152) (and on XLA's discord channels)
+Currently for Darwin (MacOS) 🚧🛠 it only works with statically linked CPU plugin 🛠🚧️ so that is the default (see issue in [XLA's issue #19152](https://github.com/openxla/xla/issues/19152) and on XLA's discord channels).
+**Experimental**.
+
+```bash
+curl -sSf https://raw.githubusercontent.com/gomlx/gopjrt/main/cmd/install_darwin_arm64.sh | bash
+```
 
 **That's it**. The next sections explains in more details for those interested in special cases.
 
@@ -304,6 +309,8 @@ All tests support the following build tags to pre-link the CPU plugin (as oppose
 * `--tags pjrt_cpu_dynamic`: link (preload) the CPU PJRT plugin from the dynamic library (`.so`) version. 
   Faster to build, but deployments require deploying the `libpjrt_c_api_cpu_dynamic.so` file along.
 
+For Darwin (MacOS), for the time being it's hardcoded with static linking, so avoid using these tags. 
+
 ## Acknowledgements
 This project utilizes the following components from the [OpenXLA project](https://openxla.org/):
 

c/BUILD

@@ -55,10 +55,12 @@ genrule(
     ],
     outs = ["lib/libpjrt_c_api_cpu_dynamic.so"],
     cmd = """
-    mkdir -p "$(@D)/gomlx/pjrt/"
-    ln "$(location @xla//xla/pjrt/c:pjrt_c_api_cpu_plugin.so)" "$(@D)/gomlx/pjrt/pjrt_c_api_cpu_plugin.so"
-    mkdir -p "$(@D)"
-    ln -sf "gomlx/pjrt/pjrt_c_api_cpu_plugin.so" "$@"
+    mkdir -p "$(@D)/gomlx/pjrt/" ;
+    ln -f "$(location @xla//xla/pjrt/c:pjrt_c_api_cpu_plugin.so)" "$(@D)/gomlx/pjrt/pjrt_c_api_cpu_plugin.so" ;
+    pushd "$(@D)" ;
+    ln -sf "gomlx/pjrt/pjrt_c_api_cpu_plugin.so" "libpjrt_c_api_cpu_dynamic.so" ;
+    ln -sf "gomlx/pjrt/pjrt_c_api_cpu_plugin.so" "pjrt_c_api_cpu_plugin.so" ;
+    popd
     """,
 )