link to libtaskchampion separately from the unity tests

integration-tests/build.rs

@@ -2,25 +2,29 @@ use std::env;
 use std::fs;
 use std::path::Path;
 
-fn build_libtaskchampion(suites: &[&'static str]) {
-    // This crate has taskchampion-lib in its build-dependencies, so
-    // libtaskchampion.so should be built already.  Hopefully it's in target/$PROFILE, and hopefully
-    // it's named libtaskchampion.so and not something else
-    let mut libtaskchampion = env::current_dir().unwrap();
-    libtaskchampion.pop();
-    libtaskchampion.push("target");
-    libtaskchampion.push(env::var("PROFILE").unwrap());
-    libtaskchampion.push("deps");
-    libtaskchampion.push(if cfg!(target_os = "macos") {
-        "libtaskchampion.dylib"
-    } else {
-        "libtaskchampion.so"
-    });
+/// Link to the libtaskchampion library produced by the `taskchampion-lib` crate.  This is done as
+/// a build dependency, rather than a cargo dependency, for unclear reasons. TODO
+fn link_libtaskchampion() {
+    // This crate has taskchampion-lib in its build-dependencies, so libtaskchampion.so should be
+    // built already.
+    //
+    // Shared libraries (crate-type=cdylib) appear to be placed in target/$PROFILE/deps.
+    let mut libtc_dir = env::current_dir().unwrap();
+    libtc_dir.pop();
+    libtc_dir.push("target");
+    libtc_dir.push(env::var("PROFILE").unwrap());
+    libtc_dir.push("deps");
 
+    let libtc_dir = libtc_dir.to_str().expect("path is valid utf-8");
+    println!("cargo:rustc-link-search={}", libtc_dir);
+    println!("cargo:rustc-link-lib=dylib=taskchampion");
+}
+
+/// Build the Unity-based C test suite in `src/bindings_tests`, linking the result with this
+/// package's library crate.
+fn build_bindings_tests(suites: &[&'static str]) {
     let mut build = cc::Build::new();
-    build.shared_flag(true);
-    build.object(libtaskchampion);
-    build.include("../lib");
+    build.include("../lib"); // include path for taskchampion.h
     build.include("src/bindings_tests/unity");
     build.define("UNITY_OUTPUT_CHAR", "test_output");
     build.define(
@@ -41,6 +45,8 @@ fn build_libtaskchampion(suites: &[&'static str]) {
     build.compile("bindings-tests");
 }
 
+/// Make `bindings_test_suites.rs` listing all of the test suites, for use in building the
+/// bindings-test binary.
 fn make_suite_file(suites: &[&'static str]) {
     let out_dir = env::var_os("OUT_DIR").unwrap();
     let dest_path = Path::new(&out_dir).join("bindings_test_suites.rs");
@@ -55,6 +61,7 @@ fn main() {
     println!("cargo:rerun-if-changed=build.rs");
 
     let suites = &["uuid", "string", "task", "replica"];
-    build_libtaskchampion(suites);
+    link_libtaskchampion();
+    build_bindings_tests(suites);
     make_suite_file(suites);
 }

lib/Cargo.toml

@@ -5,7 +5,7 @@ edition = "2018"
 
 [lib]
 name = "taskchampion"
-crate-type = ["cdylib"]
+crate-type = ["staticlib", "cdylib"]
 
 [dependencies]
 libc = "0.2.113"