Bazel: expose z3_static target for working macOS, win32 builds

.bazelrc

@@ -2,6 +2,13 @@
 common --enable_bzlmod
 common --noenable_workspace
 
+# Specifies...
+#   --config=windows on Windows hosts
+#   --config=linux on Linux hosts
+#   --config=macos on macOS hosts
+# NOTE: We assume our host and target platforms are identical.
+common --enable_platform_specific_config
+
 # Use C++20.
 build --cxxopt=-std=c++20
 build --host_cxxopt=-std=c++20

BUILD.bazel

@@ -17,10 +17,42 @@ filegroup(
 )
 
 cmake(
-    name = "z3",
-    generate_args = ["-G Ninja"],
+    name = "z3_dynamic",
+    generate_args = [
+        "-G Ninja", 
+        "-D Z3_EXPORTED_TARGETS=",  # prevents installation, leaving symlinks between dylibs intact on copy
+    ],
     lib_source = ":all_files",
     out_binaries = ["z3"],
-    out_shared_libs = ["libz3.so"],
+    out_shared_libs = select({
+        "@platforms//os:linux": ["libz3.so"],
+        # "@platforms//os:osx": ["libz3.dylib"],    # FIXME: this is not working, libz3<version>.dylib is not copied
+        # "@platforms//os:windows": ["z3.dll"],     # TODO: test this
+        "//conditions:default": ["@platforms//:incompatible"],
+    }),
+    visibility = ["//visibility:public"],
+)
+
+cmake(
+    name = "z3_static",
+    generate_args = [
+        "-G Ninja", 
+        "-D BUILD_SHARED_LIBS=OFF",
+        "-D Z3_BUILD_LIBZ3_SHARED=OFF",
+    ],
+    lib_source = ":all_files",
+    out_binaries = ["z3"],
+    out_static_libs = select({
+        "@platforms//os:linux": ["libz3.a"],
+        "@platforms//os:osx": ["libz3.a"],
+        # "@platforms//os:windows": ["z3.lib"],     # TODO: test this
+        "//conditions:default": ["@platforms//:incompatible"],
+    }),
+    visibility = ["//visibility:public"],
+)
+
+alias(
+    name = "z3",
+    actual = ":z3_dynamic",
     visibility = ["//visibility:public"],
 )

MODULE.bazel

@@ -17,3 +17,5 @@ bazel_dep(
     version = "8.0.1",
     dev_dependency = True,
 )
+
+bazel_dep(name = "platforms", version = "0.0.11")