Fix problem with tpm2-tss dependencies in bundled build.

[Superhepper]

When doing bundled build where the output is an
executable, i.e. examples, cargo needs to know
where to look for dependencies when compiling
tpm2-tss otherwise one ends up with several
missing symbols errors in the linking stage.

This adds functionality for probing dependencies
of tpm2-tss and report the search paths for the
libraries of those dependencies to cargo.

Fixes #646

[Copilot]

Pull request overview

This PR aims to fix bundled builds (especially when building an executable, e.g. examples) by ensuring Cargo/rustc can locate and link tpm2-tss’s external dependencies (e.g. OpenSSL), preventing missing-symbol linker errors (Fixes #646).

Changes:

• Add dependency probing logic to the tss-esapi-sys build script to surface dependency link search paths to Cargo during bundled builds.
• Update tss-esapi-sys documentation to clarify bundled-build dependency expectations and improve OpenSUSE package installation guidance.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
tss-esapi-sys/build.rs	Adds dependency probing in bundled builds, intended to emit Cargo link-search info for tpm2-tss dependencies.
tss-esapi-sys/README.md	Updates bundled-build notes and expands OpenSUSE dependency installation instructions.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

Comments suppressed due to low confidence (1)

tss-esapi-sys/build.rs:166

• DEPENDENCIES.iter().for_each(Dependency::probe) runs before the tss2-* libraries are reported to Cargo. Since pkg_config::probe() emits cargo:rustc-link-lib directives, this can put dependency libs (e.g., -lcrypto) before -ltss2-esys/-ltss2-sys on the final link line; with the default -Wl,--as-needed this ordering can cause the linker to drop needed shared libs and produce undefined references. Consider (1) emitting tss2-* link directives first (dependents before dependencies) and (2) probing/emitting dependency link info afterwards.

        pub fn bundled(out_path: &Path) -> Self {
            for dep in DEPENDENCIES.iter() {
                dep.probe();
            }
            let version = Self::version();
            let source_path = Self::source(out_path, &version);
            Self::compile(&source_path);
            Self {

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

[Superhepper]

If I emit the metadata of the dependencies after the compile stage then the build on Linux fails because the compiler or linker can not find the libraries.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

[Firstyear]

This seems to be working! Thank you so much!!!!

[ionut-arm]

💯