CMakeLists.txt

# Toolchain-only build products

list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/../cmake/modules)
include(AddSwiftStdlib)

set(CXX_COMPILE_FLAGS)
set(CXX_LINK_FLAGS)


set(compile_flags
  # Build the runtime with -Wall to catch, e.g., uninitialized variables
  # warnings.
  "-Wall"

  # C++ code in the runtime and standard library should generally avoid
  # introducing static constructors or destructors.
  "-Wglobal-constructors"
  "-Wexit-time-destructors"

  # We don't want runtime C++ code to export symbols we didn't explicitly
  # choose to.
  "-fvisibility=hidden")


# Build the runtime with -Wall to catch, e.g., uninitialized variables
# warnings.
if(SWIFT_COMPILER_IS_MSVC_LIKE)
  list(APPEND compile_flags "/W3")
else()
  list(APPEND compile_flags "-Wall")
endif()


foreach(flag ${compile_flags})
  check_cxx_compiler_flag("${flag}" is_supported)
  if(is_supported)
    list(APPEND CXX_COMPILE_FLAGS "${flag}")
  endif()
endforeach()
unset(compile_flags)


if("Thread" IN_LIST SWIFT_RUNTIME_USE_SANITIZERS)
  list(APPEND CXX_LINK_FLAGS "-fsanitize=thread")
endif()

# Do not enforce checks for LLVM's ABI-breaking build settings.
# The Swift runtime uses some header-only code from LLVM's ADT classes,
# but we do not want to link libSupport into the runtime. These checks rely
# on the presence of symbols in libSupport to identify how the code was
# built and cause link failures for mismatches. Without linking that library,
# we get link failures regardless, so instead, this just disables the checks.
if(CMAKE_VERSION VERSION_LESS 3.12)
  append("-DLLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING=1" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
else()
  add_compile_definitions(LLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING=1)
endif()

# Compatibility libraries build in a special alternate universe that can't
# directly link to most OS runtime libraries, and have to access the
# runtime being patched only through public ABI.
list(APPEND CXX_COMPILE_FLAGS "-DSWIFT_COMPATIBILITY_LIBRARY=1")

add_subdirectory(legacy_layouts)
add_subdirectory(Compatibility50)
add_subdirectory(Compatibility51)
add_subdirectory(CompatibilityDynamicReplacements)