Ask for debug output

Author: neonichu

Sources/Commands/Utilities/TestingSupport.swift

@@ -102,6 +102,7 @@ enum TestingSupport {
             sanitizers: sanitizers
         )
         let args = [path.description, "--dump-tests-json"]
+        print(env)
         let data = try Process.checkNonZeroExit(arguments: args, environment: env)
         #endif
         // Parse json and return TestSuites.
@@ -136,6 +137,7 @@ enum TestingSupport {
         #elseif os(Linux)
         // Pass this explicitly on Linux because XCTest started requiring it, rdar://103054033
         env["LD_LIBRARY_PATH"] = "/usr/lib/swift/linux"
+        env["LD_DEBUG"] = "all"
         #endif
         return env
         #else