Allow compile tests to run under both debug and release profiles.

Fixes #28.

tests/tests.rs

@@ -3,9 +3,9 @@
 
 extern crate compiletest_rs as compiletest;
 
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 
-fn find_rlib(dependency_path: &str, dependency_name: &str) -> std::io::Result<Option<PathBuf>> {
+fn find_rlib(dependency_path: &Path, dependency_name: &str) -> std::io::Result<Option<PathBuf>> {
     use std::fs::read_dir;
 
     for entry in read_dir(dependency_path)? {
@@ -23,8 +23,8 @@ fn find_rlib(dependency_path: &str, dependency_name: &str) -> std::io::Result<Op
     Ok(None)
 }
 
-fn rustc_flags(dependency_path: &str, dependencies: &[&str]) -> String {
-    let mut flags = format!("--edition=2021 -L dependency={} ", dependency_path);
+fn rustc_flags(dependency_path: &Path, dependencies: &[&str]) -> String {
+    let mut flags = format!("--edition=2021 -L dependency={} ", dependency_path.display());
 
     for dep in dependencies {
         let rlib_path = find_rlib(dependency_path, dep).expect("io error").expect("rlib not found");
@@ -35,6 +35,18 @@ fn rustc_flags(dependency_path: &str, dependencies: &[&str]) -> String {
     flags
 }
 
+fn dependency_path() -> PathBuf {
+    std::env::var("LD_LIBRARY_PATH")
+        .ok()
+        .or_else(|| std::env::var("DYLD_FALLBACK_LIBRARY_PATH").ok())
+        .or_else(|| std::env::var("PATH").ok())
+        .expect("unable to find the dependency path")
+        .split(':')
+        .map(PathBuf::from)
+        .find(|path| path.ends_with("deps"))
+        .expect("could not find dependency path")
+}
+
 #[test]
 fn compile_tests() {
     use compiletest::common::Mode;
@@ -48,7 +60,7 @@ fn compile_tests() {
 
     let dependencies = ["archery", "static_assertions"];
 
-    config.target_rustcflags = Some(rustc_flags("target/debug/deps/", &dependencies));
+    config.target_rustcflags = Some(rustc_flags(&dependency_path(), &dependencies));
 
     compiletest::run_tests(&config);
 }