# Lists of warnings to enable
set(GCC_WARNINGS
  all no-sign-compare)
set(CLANG_WARNINGS ${GCC_WARNINGS} no-tautological-compare)

# Candidates for -Werror
# Warnings in common between GCC and clang
set(GCC_ERROR_WARNINGS
  array-bounds
  delete-incomplete
  int-in-bool-context
  return-type
  sequence-point
  switch
  unused-value)
# clang-only warnings
set(CLANG_ERROR_WARNINGS ${GCC_ERROR_WARNINGS}
  mismatched-tags
  return-stack-address
  uninitialized)
# GCC-only warnings
list(APPEND GCC_ERROR_WARNINGS
  maybe-uninitialized
  stringop-truncation)

# Prepend -W and -Werror=
list(TRANSFORM GCC_WARNINGS PREPEND -W)
list(TRANSFORM CLANG_WARNINGS PREPEND -W)

if (FREECIV_ENABLE_WERROR)
  # Only ever use -Werror in debug mode.
  set(MAYBE_WERROR $<IF:$<CONFIG:Debug>,-Werror=,-W>)
else()
  set(MAYBE_WERROR -W)
endif()
list(TRANSFORM GCC_ERROR_WARNINGS PREPEND ${MAYBE_WERROR})
list(TRANSFORM CLANG_ERROR_WARNINGS PREPEND ${MAYBE_WERROR})

# Join the two groups
list(APPEND GCC_WARNINGS ${GCC_ERROR_WARNINGS})
list(APPEND CLANG_WARNINGS ${CLANG_ERROR_WARNINGS})

# Enable them
add_compile_options(
  "$<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:${CLANG_WARNINGS}>"
  "$<$<CXX_COMPILER_ID:GNU>:${GCC_WARNINGS}>")

# Set no warnings for clang-cl
if (${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang" AND "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
  add_compile_options(-Wno-everything)
endif()

add_definitions(-DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x051500)