Package with resources will fail to build when package contains Objective-C and C

[ncooke3]

Description

The package manager supports mixing C family language sources within a single target. When adding a resource; however, compilation of the target fails because compiling the C sources will try to import Foundation.

Expected behavior

The package will build successfully.

Actual behavior

The package fails. Upon inspection of the build manifest, it appears that the resource_bundle_accessor.h is being added as an input to the compilation of the C sources. This causes an error because resource_bundle_accessor.h imports Foundation.

Steps to reproduce

I have provided a minimal, reproducible example: https://github.com/ncooke3/Package5923

1. Clone it, and cd into the package
2. Run swift build

Alternatively, without the example project:

1. Create a package with an Objective-C header and implementation as well as a C header and implementation.
2. Run swift build –– it should build.
3. Now, add a resource file to the package and specify it in the package manifest.
4. Run swift build –– it should fail to build with the error see in the example project's README.

Swift Package Manager version/commit hash

Swift Package Manager - Swift 5.6.0

Swift & OS version (output of swift --version && uname -a)

swift-driver version: 1.45.2 Apple Swift version 5.6 (swiftlang-5.6.0.323.62 clang-1316.0.20.8)
Target: x86_64-apple-macosx12.0
Darwin nickcooke-macbookpro 21.6.0 Darwin Kernel Version 21.6.0: Thu Sep 29 20:12:57 PDT 2022; root:xnu-8020.240.7~1/RELEASE_X86_64 x86_64

[ncooke3]

I proposed a fix in #5924.