environment_variables.swift

// RUN: %empty-directory(%t)
// RUN: %target-build-swift %s -o %t/main
// RUN: %target-codesign %t/main

// REQUIRES: executable_test
// UNSUPPORTED: use_os_stdlib

// RUN: env %env-SWIFT_DEBUG_HELP=YES %env-SWIFT_DEBUG_SOME_UNKNOWN_VARIABLE=42 %env-SWIFT_DEBUG_ENABLE_METADATA_ALLOCATION_ITERATION=YES %env-SWIFT_DEBUG_IMPLICIT_OBJC_ENTRYPOINT=abc %env-SWIFT_DETERMINISTIC_HASHING=whatever %env-SWIFT_ENABLE_MANGLED_NAME_VERIFICATION=YES %target-run %t/main 2>&1 | %FileCheck %s --dump-input fail

// CHECK-DAG: {{Warning: unknown environment variable SWIFT_DEBUG_SOME_UNKNOWN_VARIABLE|Using getenv to read variables. Unknown SWIFT_DEBUG_ variables will not be flagged.}}
// CHECK-DAG: Warning: cannot parse value SWIFT_DEBUG_IMPLICIT_OBJC_ENTRYPOINT=abc, defaulting to 2.
// CHECK-DAG: Warning: cannot parse value SWIFT_DETERMINISTIC_HASHING=whatever, defaulting to false.
// CHECK-DAG: Swift runtime debugging:
// CHECK-DAG:    bool SWIFT_DEBUG_ENABLE_METADATA_ALLOCATION_ITERATION [default: false] - Enable additional metadata allocation tracking for swift-inspect to use.
// CHECK-DAG: uint8_t SWIFT_DEBUG_IMPLICIT_OBJC_ENTRYPOINT [default: 2] - Print warnings when using implicit @objc entrypoints. Set to desired reporting level, 0-3.
// CHECK-DAG:    bool SWIFT_DETERMINISTIC_HASHING [default: false] - Disable randomized hash seeding.
// CHECK-DAG:    bool SWIFT_ENABLE_MANGLED_NAME_VERIFICATION [default: false] - Enable verification that metadata can roundtrip through a mangled name each time metadata is instantiated.

print("Hello, world")
// CHECK: Hello, world