feat: support public/interface dependencies in packer

packer/README.md

@@ -39,6 +39,20 @@ namespace_name = "foobar"
 # Target-name part of the generated CMake target.
 # This property is optional; it defaults to the name of the target Rust project.
 target_name = "foobar"
+# Declared CMake dependencies.
+# Each entry carries a `package` (passed to find_dependency argument) and a `target`
+# (linked into the generated imported target via INTERFACE_LINK_LIBRARIES).
+# This property is optional; it defaults to no dependencies.
+# Because the packer only ever ships dynamic libraries, there are no private or
+# static dependencies, and no separate field for them.
+# Declaring dependencies here is rarely necessary and is NOT recommended: it
+# behaves like a CMake interface/public dependency, and exposing other
+# libraries' raw types across the FFI boundary raises ABI-compatibility
+# concerns across runtimes. Use it only when this crate is explicitly a wrapper
+# around another library.
+dependencies = [
+    { package = "ZLIB 1.3.2 REQUIRED", target = "ZLIB::ZLIB" },
+]
 
 [package.metadata.omrf.pkgconfig]
 # The unique identifier of the package.
@@ -50,6 +64,14 @@ name = "Foo Bar"
 # Brief description of the package.
 # This property is optional; it defaults to the description of the target Rust project.
 description = "a brown fox jumps over a lazy dog."
+# Declared public pkg-config dependencies.
+# This property is optional; it defaults to no dependencies.
+# Because the packer only ever ships dynamic libraries, there are no private
+# dependencies and Requires.private is not used.
+# Declaring dependencies here is rarely necessary and is NOT recommended, for
+# the same ABI-compatibility reasons as the CMake dependencies above. Use it
+# only when this crate is explicitly a wrapper around another library.
+requires = ["libfoo >= 1.0", "libbar"]
 
 ```