# Disable warnings for upstream projects.
if (MSVC)
  set(DISABLE_WARNING_FLAGS
    -wd4018 # 'expression' : signed/unsigned mismatch
    -wd4090 # 'operation' : different 'modifier' qualifiers
    -wd4200 # nonstandard extension used: zero-sized array in struct/union
    -wd4201 # nonstandard extension used: nameless struct/union
    -wd4334 # 'operator': result of 32-bit shift implicitly converted to 64 bits (was 64-bit shift intended?)
    -wd4221 # nonstandard extension used : 'identifier' : cannot be initialized using address of automatic variable
  )
else ()
  set(DISABLE_WARNING_FLAGS "-w")
endif ()


# External: Integer Set Library
if (POLLY_BUNDLED_ISL)
  set(ISL_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/isl")
  set(ISL_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/isl")

  # Determine version of isl
  if (EXISTS "${ISL_SOURCE_DIR}/GIT_HEAD_ID")
    # The source comes from a 'make dist' archive
    file(READ "${ISL_SOURCE_DIR}/GIT_HEAD_ID" ISL_GIT_HEAD_ID)
    string(STRIP "${ISL_GIT_HEAD_ID}" ISL_GIT_HEAD_ID)
  elseif (EXISTS "${ISL_SOURCE_DIR}/gitversion.h")
    # The source directory is preconfigured
    file(READ "${ISL_SOURCE_DIR}/gitversion.h" GITVERSION_H)
    string(REGEX REPLACE ".*\\\"([^\\\"]*)\\\".*" "\\1" ISL_GIT_HEAD_ID "${GITVERSION_H}")
  elseif ()
    # Unknown revision
    # TODO: We could look for a .git and get the revision from HEAD
    set(ISL_GIT_HEAD_ID "UNKNOWN")
  endif ()

  message(STATUS "ISL version: ${ISL_GIT_HEAD_ID}")

  # Enable small integer optimization and imath
  set(USE_GMP_FOR_MP OFF)
  set(USE_IMATH_FOR_MP ON)
  set(USE_SMALL_INT_OPT ON)

  # Determine compiler characteristics
  include(CheckCSourceCompiles)

  # Like check_c_source_compiles, but sets the result to either
  # 0 (error while compiling) or 1 (compiled successfully)
  # Required for compatibility with autotool's AC_CHECK_DECLS
  function (check_c_source_compiles_numeric _prog _var)
    check_c_source_compiles("${_prog}" "${_var}")
    if ("${${_var}}")
      set("${_var}" 1 PARENT_SCOPE)
    else ()
      set("${_var}" 0 PARENT_SCOPE)
    endif ()
  endfunction ()

  # Check for the existance of a type
  function (check_c_type_exists _type _files _variable)
    set(_includes "")
    foreach (file_name ${_files})
      set(_includes "${_includes}#include<${file_name}>\n")
    endforeach()
    check_c_source_compiles("
    ${_includes}
    ${_type} typeVar;
    int main(void) {
    return 0;
    }
    " ${_variable})
  endfunction ()


  check_c_source_compiles("
  int func(void) __attribute__((__warn_unused_result__));
  int main(void) { return 0; }
  " HAS_ATTRIBUTE_WARN_UNUSED_RESULT)
  set(GCC_WARN_UNUSED_RESULT)
  if (HAS_ATTRIBUTE_WARN_UNUSED_RESULT)
    set(GCC_WARN_UNUSED_RESULT "__attribute__((__warn_unused_result__))")
  endif ()

  check_c_source_compiles("
  __attribute__ ((unused)) static void foo(void);
  int main(void) { return 0; }
  " HAVE___ATTRIBUTE__)


  check_c_source_compiles_numeric("
  #include <strings.h>
  int main(void) { (void)ffs(0); return 0; }
  " HAVE_DECL_FFS)

  check_c_source_compiles_numeric("
  int main(void) { (void)__builtin_ffs(0); return 0; }
  " HAVE_DECL___BUILTIN_FFS)

  check_c_source_compiles_numeric("
  #include <intrin.h>
  int main(void) { (void)_BitScanForward(NULL, 0); return 0; }
  " HAVE_DECL__BITSCANFORWARD)

  if (NOT HAVE_DECL_FFS AND
      NOT HAVE_DECL___BUILTIN_FFS AND
      NOT HAVE_DECL__BITSCANFORWARD)
    message(FATAL_ERROR "No ffs implementation found")
  endif ()


  check_c_source_compiles_numeric("
  #include <strings.h>
  int main(void) { (void)strcasecmp(\"\", \"\"); return 0; }
  " HAVE_DECL_STRCASECMP)

  check_c_source_compiles_numeric("
  #include <string.h>
  int main(void) { (void)_stricmp(\"\", \"\"); return 0; }
  " HAVE_DECL__STRICMP)

  if (NOT HAVE_DECL_STRCASECMP AND NOT HAVE_DECL__STRICMP)
    message(FATAL_ERROR "No strcasecmp implementation found")
  endif ()


  check_c_source_compiles_numeric("
  #include <strings.h>
  int main(void) { (void)strncasecmp(\"\", \"\", 0); return 0; }
  " HAVE_DECL_STRNCASECMP)

  check_c_source_compiles_numeric("
  #include <string.h>
  int main(void) { (void)_strnicmp(\"\", \"\", 0); return 0; }
  " HAVE_DECL__STRNICMP)

  if (NOT HAVE_DECL_STRNCASECMP AND NOT HAVE_DECL__STRNICMP)
    message(FATAL_ERROR "No strncasecmp implementation found")
  endif ()


  check_c_source_compiles_numeric("
  #include <stdio.h>
  int main(void) { snprintf((void*)0, 0, \" \"); return 0; }
  " HAVE_DECL_SNPRINTF)

  check_c_source_compiles_numeric("
  #include <stdio.h>
  int main(void) { _snprintf((void*)0, 0, \" \"); return 0; }
  " HAVE_DECL__SNPRINTF)

  if (NOT HAVE_DECL_SNPRINTF AND NOT HAVE_DECL__SNPRINTF)
    message(FATAL_ERROR "No snprintf implementation found")
  endif ()


  check_c_type_exists(uint8_t "" HAVE_UINT8T)
  check_c_type_exists(uint8_t "stdint.h" HAVE_STDINT_H)
  check_c_type_exists(uint8_t "inttypes.h" HAVE_INTTYPES_H)
  check_c_type_exists(uint8_t "sys/types.h" HAVE_SYS_INTTYPES_H)
  if (HAVE_UINT8T)
    set(INCLUDE_STDINT_H "")
  elseif (HAVE_STDINT_H)
    set(INCLUDE_STDINT_H "#include <stdint.h>")
  elseif (HAVE_INTTYPES_H)
    set(INCLUDE_STDINT_H "#include <inttypes.h>")
  elseif (HAVE_SYS_INTTYPES_H)
    set(INCLUDE_STDINT_H "#include <sys/inttypes.h>")
  else ()
    message(FATAL_ERROR "No stdint.h or compatible found")
  endif ()

  # Write configure result
  # configure_file(... COPYONLY) avoids that the time stamp changes if the file is identical
  file(WRITE "${ISL_BINARY_DIR}/gitversion.h.tmp"
    "#define GIT_HEAD_ID \"${ISL_GIT_HEAD_ID}\"")
  configure_file("${ISL_BINARY_DIR}/gitversion.h.tmp"
    "${ISL_BINARY_DIR}/gitversion.h" COPYONLY)

  file(WRITE "${ISL_BINARY_DIR}/include/isl/stdint.h.tmp"
    "${INCLUDE_STDINT_H}\n")
  configure_file("${ISL_BINARY_DIR}/include/isl/stdint.h.tmp"
    "${ISL_BINARY_DIR}/include/isl/stdint.h" COPYONLY)

  configure_file("isl_config.h.cmake" "${ISL_BINARY_DIR}/isl_config.h")
  configure_file("isl_srcdir.c.cmake" "${ISL_BINARY_DIR}/isl_srcdir.c")

  include_directories(BEFORE
    ${ISL_BINARY_DIR}
    ${ISL_SOURCE_DIR}/imath
    ${ISL_SOURCE_DIR}/include
    ${ISL_SOURCE_DIR}
    )

  # ISL files to compile
  set (ISL_FILES
    isl/basis_reduction_tab.c
    isl/isl_aff.c
    isl/isl_aff_map.c
    isl/isl_affine_hull.c
    isl/isl_arg.c
    isl/isl_ast_build.c
    isl/isl_ast_build_expr.c
    isl/isl_ast.c
    isl/isl_ast_codegen.c
    isl/isl_ast_graft.c
    isl/isl_bernstein.c
    isl/isl_blk.c
    isl/isl_bound.c
    isl/isl_box.c
    isl/isl_coalesce.c
    isl/isl_constraint.c
    isl/isl_convex_hull.c
    isl/isl_ctx.c
    isl/isl_deprecated.c
    isl/isl_dim_map.c
    isl/isl_equalities.c
    isl/isl_factorization.c
    isl/isl_farkas.c
    isl/isl_ffs.c
    isl/isl_flow.c
    isl/isl_fold.c
    isl/isl_hash.c
    isl/isl_id.c
    isl/isl_id_to_ast_expr.c
    isl/isl_id_to_id.c
    isl/isl_id_to_pw_aff.c
    isl/isl_ilp.c
    isl/isl_imath.c
    isl/isl_input.c
    isl/isl_int_sioimath.c
    isl/isl_local.c
    isl/isl_local_space.c
    isl/isl_lp.c
    isl/isl_map.c
    isl/isl_map_list.c
    isl/isl_map_simplify.c
    isl/isl_map_subtract.c
    isl/isl_map_to_basic_set.c
    isl/isl_mat.c
    isl/isl_morph.c
    isl/isl_obj.c
    isl/isl_options.c
    isl/isl_output.c
    isl/isl_point.c
    isl/isl_polynomial.c
    isl/isl_printer.c
    isl/isl_range.c
    isl/isl_reordering.c
    isl/isl_sample.c
    isl/isl_scan.c
    isl/isl_schedule.c
    isl/isl_schedule_band.c
    isl/isl_schedule_constraints.c
    isl/isl_schedule_node.c
    isl/isl_schedule_read.c
    isl/isl_schedule_tree.c
    isl/isl_scheduler.c
    isl/isl_scheduler_clustering.c
    isl/isl_scheduler_scc.c
    isl/isl_seq.c
    isl/isl_set_list.c
    isl/isl_set_to_ast_graft_list.c
    isl/isl_sort.c
    isl/isl_space.c
    isl/isl_stride.c
    isl/isl_stream.c
    isl/isl_tab.c
    isl/isl_tab_pip.c
    isl/isl_tarjan.c
    isl/isl_transitive_closure.c
    isl/isl_union_map.c
    isl/isl_val.c
    isl/isl_val_sioimath.c
    isl/isl_vec.c
    isl/isl_version.c
    isl/isl_vertices.c
    isl/print.c
    isl/set_to_map.c
    isl/set_from_map.c
    isl/uset_to_umap.c
    isl/uset_from_umap.c
    isl/imath/gmp_compat.c
    isl/imath/imath.c
    isl/imath/imrat.c
    )

  add_polly_library(PollyISL
    ${ISL_FILES}
    )


  if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
    install(DIRECTORY
      ${ISL_SOURCE_DIR}/include/
      ${ISL_BINARY_DIR}/include/
      DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/polly"
      FILES_MATCHING
      PATTERN "*.h"
      PATTERN "CMakeFiles" EXCLUDE
      )
  endif()

  add_executable(polly-isl-test
    isl/isl_test.c
    )
  set_target_properties(polly-isl-test PROPERTIES FOLDER "Polly")

  target_link_libraries(polly-isl-test PRIVATE
    PollyISL
    LLVMSupport
    )

  # ISL requires at least C99 to compile. gcc < 5.0 use -std=gnu89 as default.
  set_property(TARGET PollyISL polly-isl-test PROPERTY C_STANDARD 99)

  target_compile_options(PollyISL PRIVATE ${DISABLE_WARNING_FLAGS})
  target_compile_options(polly-isl-test PRIVATE ${DISABLE_WARNING_FLAGS})
endif (POLLY_BUNDLED_ISL)