# This file is included from the def.cmake CMakeLists.txt file.
# It sets up the compiler specific flags.

# Define the common flags and options for GCC
option(PROFILE "Enable profiling" OFF)
add_library(common_compiler_flags INTERFACE)

function(set_if_empty var value)
  if(DEFINED ENV{${var}} AND NOT "$ENV{${var}}" STREQUAL "")
    set(${var}
        ${value}
        PARENT_SCOPE
    )
    set(${var} "$ENV{${var}}")
  else()
    set(${var}
        ${value}
        PARENT_SCOPE
    )
  endif()
endfunction()

# Define the flags for the C compiler
if(TARGET_ARCH MATCHES "x86_64")

  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)

    target_compile_options(common_compiler_flags INTERFACE -funroll-loops -Wcast-align)

    # If GCC version is greater than 4.2, enable the following flags
    if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.2)
      set_if_empty(CPUTYPE "generic")
      target_compile_options(
        common_compiler_flags INTERFACE -m64 -minline-all-stringops -falign-loops -ftree-vectorize
                                        -fno-strict-overflow -mtune=${CPUTYPE}
      )
      target_link_options(common_compiler_flags INTERFACE -m64)
    elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.0)
      set_if_empty(CPUTYPE "athlon64")
      target_compile_options(
        common_compiler_flags INTERFACE -m64 -minline-all-stringops -falign-loops -ftree-vectorize
                                        -mtune=${CPUTYPE}
      )
      target_link_options(common_compiler_flags INTERFACE -m64)
    else()
      message(
        WARNING
          "You are using an old and unsupported gcc version ${CMAKE_C_COMPILER_VERSION}, compile at your own risk!"
      )
    endif()
  elseif(CMAKE_C_COMPILER_ID STREQUAL "Clang")
    set_if_empty(CPUTYPE "opteron")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)
    target_compile_options(common_compiler_flags INTERFACE -m64)
    target_link_options(common_compiler_flags INTERFACE -m64)
  elseif(CMAKE_C_COMPILER_ID STREQUAL "Intel")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)
    target_compile_options(common_compiler_flags INTERFACE -O3 -ipo -ipo_obj -unroll -tpp6 -xK)
  else()
    message(
      WARNING
        "Unsupported compiler (${CMAKE_C_COMPILER_ID}) for x86_64. Try GCC, Clang, or ICC. Compile at your own risk!"
    )
  endif()

elseif(TARGET_ARCH MATCHES "i386")

  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)

    target_compile_options(common_compiler_flags INTERFACE -Wall -funroll-loops -Wcast-align)

    # If GCC version is greater than 4.2.0, enable the following flags
    if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.2)
      set_if_empty(CPUTYPE "generic")
      target_compile_options(
        common_compiler_flags INTERFACE -m32 -minline-all-stringops -falign-loops -ftree-vectorize
                                        -fno-strict-overflow -mtune=${CPUTYPE}
      )
    elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.0)
      set_if_empty(CPUTYPE "athlon64")
      target_compile_options(
        common_compiler_flags INTERFACE -m32 -minline-all-stringops -falign-loops -ftree-vectorize
                                        -mtune=${CPUTYPE}
      )
    else()
      message(
        WARNING
          "You are using an old and unsupported gcc version ${CMAKE_C_COMPILER_VERSION}, compile at your own risk!"
      )
    endif()
  elseif(CMAKE_C_COMPILER_ID STREQUAL "Clang")
    set_if_empty(CPUTYPE "athlon64")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)
    target_compile_options(common_compiler_flags INTERFACE -m32 -mtune=${CPUTYPE})
    target_link_options(common_compiler_flags INTERFACE -m32)
  elseif(CMAKE_C_COMPILER_ID STREQUAL "Intel")
    # ICC- Intel classic specific flags
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)
    target_compile_options(common_compiler_flags INTERFACE -O3 -ipo -ipo_obj -unroll -tpp6 -xK)
  else()
    message(
      WARNING "Unsupported compiler (${CMAKE_C_COMPILER_ID}) for i386. Try GCC, Clang, or ICC."
    )
  endif()

elseif(TARGET_ARCH MATCHES "aarch64")

  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)

    # target_compile_options(common INTERFACE -O0 # <$<$<BOOL:${PROFILE}>:-pg> )

    # target_compile_options( common INTERFACE -marm -march=armv5t
    # -funroll-loops -fsigned-char )

    # # If GCC version is greater than 4.2.0, enable the following flags
    # if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.2.0) target_compile_options(
    # common INTERFACE -ftree-vectorize -fno-strict-overflow ) endif()

  endif()

elseif(TARGET_ARCH MATCHES "ppc64$")
  # PowerPC 64-bit specific flags
  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)
    target_compile_options(common_compiler_flags INTERFACE -funroll-loops -fsigned-char)

    # Try to get CPUTYPE from the environment, fallback to "powerpc64" if not set
    if(DEFINED ENV{CPUTYPE} AND NOT "$ENV{CPUTYPE}" STREQUAL "")
      set(CPUTYPE "$ENV{CPUTYPE}")
    else()
      set(CPUTYPE "powerpc64")
    endif()

    if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 4.2)
      target_compile_options(
        common_compiler_flags INTERFACE -ftree-vectorize -fno-strict-overflow -mtune=${CPUTYPE}
                                        -maltivec
      )
    elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 4.0)
      target_compile_options(
        common_compiler_flags INTERFACE -ftree-vectorize -mtune=${CPUTYPE} -maltivec
      )
    elseif(CMAKE_C_COMPILER_VERSION VERSION_LESS 3.0)
      message(
        WARNING
          "GCC version ${CMAKE_C_COMPILER_VERSION} is too old for ppc64. Try GCC 3.0 or newer."
      )
    endif()
  else()
    message(WARNING "Unsupported compiler (${CMAKE_C_COMPILER_ID}) for ppc64. Try GCC.")
  endif()
elseif(TARGET_ARCH STREQUAL "ppc")
  # PowerPC 32-bit specific flags
  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)
    if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 4.2)
      set_if_empty(CPUTYPE "powerpc")
      target_compile_options(
        common_compiler_flags INTERFACE -funroll-loops -fsigned-char -ftree-vectorize -maltivec
                                        -fno-strict-overflow -mtune=${CPUTYPE}
      )
    elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 4.0)
      set_if_empty(CPUTYPE "powerpc")
      target_compile_options(
        common_compiler_flags INTERFACE -funroll-loops -fsigned-char -ftree-vectorize -maltivec
                                        -mtune=${CPUTYPE}
      )
    else()
      message(
        WARNING "GCC version ${CMAKE_C_COMPILER_VERSION} is too old for ppc. Try GCC 4.0 or newer."
      )
    endif()
  else()
    message(
      WARNING
        "Unsupported compiler (${CMAKE_C_COMPILER_ID}) for ${TARGET_ARCH}. Try GCC. Compile at your own risk!"
    )
  endif()
elseif(TARGET_ARCH STREQUAL "arm7")
  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)

    # ARM specific flags
    target_compile_options(
      common_compiler_flags INTERFACE -march=armv7-a -funroll-loops -fsigned-char
    )
    if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.2.0)
      target_compile_options(common_compiler_flags INTERFACE -ftree-vectorize -fno-strict-overflow)
    elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.0)
      target_compile_options(common_compiler_flags INTERFACE -ftree-vectorize)
    else()
      message(
        WARNING "GCC version ${CMAKE_C_COMPILER_VERSION} is too old for arm7. Try GCC 4.0 or newer."
      )
    endif()
  else()
    message(WARNING "Unsupported compiler (${CMAKE_C_COMPILER_ID}) for arm7. Try GCC.")
  endif()
elseif(TARGET_ARCH STREQUAL "arm6")
  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)
    target_compile_options(
      common_compiler_flags INTERFACE -march=armv6 -funroll-loops -fsigned-char
    )
    if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.2.0)
      target_compile_options(common_compiler_flags INTERFACE -ftree-vectorize -fno-strict-overflow)
    elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.0)
      target_compile_options(common_compiler_flags INTERFACE -ftree-vectorize)
    else()
      message(
        WARNING "GCC version ${CMAKE_C_COMPILER_VERSION} is too old for arm6. Try GCC 4.0 or newer."
      )
    endif()
  else()
    message(WARNING "Unsupported compiler (${CMAKE_C_COMPILER_ID}) for arm6. Try GCC.")
  endif()
elseif(TARGET_ARCH STREQUAL "arm")
  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)

    # ARM specific flags
    target_compile_options(
      common_compiler_flags INTERFACE -marm -march=armv5t -funroll-loops -fsigned-char
    )
    if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.2.0)
      target_compile_options(common_compiler_flags INTERFACE -ftree-vectorize -fno-strict-overflow)
    elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.0)
      target_compile_options(common_compiler_flags INTERFACE -ftree-vectorize)
    else()
      message(
        WARNING "GCC version ${CMAKE_C_COMPILER_VERSION} is too old for arm. Try GCC 4.0 or newer."
      )
    endif()
  else()
    message(WARNING "Unsupported compiler (${CMAKE_C_COMPILER_ID}) for arm. Try GCC.")
  endif()
elseif(TARGET_ARCH STREQUAL "sparc64")
  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM SPARC64_MODE)
    target_compile_options(common_compiler_flags INTERFACE -funroll-loops)
    if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.2)
      set_if_empty(CPUTYPE "ultrasparc")
      target_compile_options(
        common_compiler_flags INTERFACE -m64 -mcpu=ultrasparc -mtune=${CPUTYPE}
                                        -fno-strict-overflow -ftree-vectorize
      )
      target_link_options(common_compiler_flags INTERFACE -m64)
    elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.0)
      set_if_empty(CPUTYPE "ultrasparc")
      target_compile_options(
        common_compiler_flags INTERFACE -m64 -mcpu=ultrasparc -mtune=${CPUTYPE} -ftree-vectorize
      )
    endif()
    # The following CMAKE_C_COMPILER_ID is not available per cmake docs
    # TODO: Use some other variable to check like CC
  elseif(CMAKE_C_COMPILER_ID STREQUAL "Sun")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM SPARC64_MODE)
    target_compile_options(
      common_compiler_flags
      INTERFACE -m64
                -xO3
                -xtarget=native
                -xmemalign=8i
                -fma=fused
                -fns=yes
                -xc99
    )
  else()
    message(WARNING "Unsupported compiler (${CMAKE_C_COMPILER_ID}) for sparc64. Try GCC or Sun.")
  endif()
elseif(TARGET_ARCH STREQUAL "sparc")
  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)
    target_compile_options(common_compiler_flags INTERFACE -funroll-loops)
    if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.2)
      set_if_empty(CPUTYPE "v8")
      target_compile_options(
        common_compiler_flags INTERFACE -mtune=${CPUTYPE} -fno-strict-overflow -ftree-vectorize
      )
    elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.0)
      set_if_empty(CPUTYPE "v8")
      target_compile_options(common_compiler_flags INTERFACE -mtune=${CPUTYPE} -ftree-vectorize)
    endif()
    # The following CMAKE_C_COMPILER_ID is not available per cmake docs
    # TODO: Use some other variable to check like CC
  elseif(CMAKE_C_COMPILER_ID STREQUAL "Sun")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)
    target_compile_options(
      common_compiler_flags INTERFACE -xO3 -xtarget=native -xmemalign=4i -fma=fused -fns=yes -xc99
    )
  else()
    message(WARNING "Unsupported compiler (${CMAKE_C_COMPILER_ID}) for sparc. Try GCC or Sun.")
  endif()
elseif(TARGET_ARCH STREQUAL "mips")
  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)
    target_compile_options(common_compiler_flags INTERFACE -funroll-loops)
    if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.2)
      target_compile_options(
        common_compiler_flags INTERFACE -mfp32 -march=r3000 -ftree-vectorize -fno-strict-overflow
      )
    elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.0)
      target_compile_options(common_compiler_flags INTERFACE -march=r3000 -ftree-vectorize)
    else()
      message(
        WARNING "GCC version ${CMAKE_C_COMPILER_VERSION} is too old for mips. Try GCC 4.0 or newer."
      )
    endif()

  else()
    message(WARNING "Unsupported compiler (${CMAKE_C_COMPILER_ID}) for mips. Try GCC.")
  endif()
elseif(TARGET_ARCH STREQUAL "mips2")
  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)
    target_compile_options(common_compiler_flags INTERFACE -funroll-loops)
    if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.2)
      target_compile_options(common_compiler_flags INTERFACE -ftree-vectorize -fno-strict-overflow)
    elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.0)
      target_compile_options(common_compiler_flags INTERFACE -ftree-vectorize)
    elseif(CMAKE_C_COMPILER_VERSION VERSION_LESS 3.0)
      message(
        WARNING
          "You are using an old and unsupported gcc version ${CMAKE_C_COMPILER_VERSION}, compile at your own risk!"
      )
    endif()
  else()
    message(
      WARNING
        "Unsupported compiler (${CMAKE_C_COMPILER_ID}) for ${TARGET_ARCH}. Try GCC. Compile at your own risk!"
    )
  endif()
elseif(TARGET_ARCH STREQUAL "mips64")
  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)
    target_compile_options(common_compiler_flags INTERFACE -funroll-loops)
    if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.2)
      target_compile_options(common_compiler_flags INTERFACE -ftree-vectorize -fno-strict-overflow)
    elseif(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.0)
      target_compile_options(common_compiler_flags INTERFACE -ftree-vectorize)
    elseif(CMAKE_C_COMPILER_VERSION VERSION_LESS 3.0)
      message(
        WARNING
          "You are using an old and unsupported gcc version ${CMAKE_C_COMPILER_VERSION}, compile at your own risk!"
      )
    endif()
  else()
    message(
      WARNING
        "Unsupported compiler (${CMAKE_C_COMPILER_ID}) for ${TARGET_ARCH}. Try GCC. Compile at your own risk!"
    )
  endif()
elseif(TARGET_ARCH STREQUAL "alpha")
  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
    target_compile_definitions(common_compiler_flags INTERFACE CC_GCC_LIKE_ASM)
    target_compile_options(common_compiler_flags INTERFACE -funroll-loops)
    if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.2)
      target_compile_options(common_compiler_flags INTERFACE -fno-strict-overflow)
    elseif(CMAKE_C_COMPILER_VERSION VERSION_LESS 3.0)
      message(
        WARNING
          "You are using an old and unsupported gcc version ${CMAKE_C_COMPILER_VERSION}, compile at your own risk!"
      )
    endif()
  else()
    message(
      WARNING
        "Unsupported compiler (${CMAKE_C_COMPILER_ID}) for ${TARGET_ARCH}. Try GCC. Compile at your own risk!"
    )
  endif()
else()
  message(
    WARNING
      "Architecture ${TARGET_ARCH} not directly supported by project. Proceeding with generic flags. \
       Define any compile options you might need with env variables like CFLAGS."
  )
endif()