# This file is part of LyX, the document processor.
# Licence details can be found in the file COPYING.
#
# Copyright (c) 2006, Peter Kümmel, <syntheticpp@gmx.net>
#

include(CheckIncludeFile)
include(CheckIncludeFileCXX)
include(CheckIncludeFiles)
include(CheckSymbolExists)
include(CheckFunctionExists)
include(CheckLibraryExists)
include(CheckTypeSize)
include(CheckCXXSourceCompiles)
include(CheckCXXSourceRuns)
include(MacroBoolTo01)
include(TestBigEndian)

test_big_endian(WORDS_BIGENDIAN)

#check_include_file_cxx(istream HAVE_ISTREAM)
#check_include_file_cxx(ostream HAVE_OSTREAM)
#check_include_file_cxx(sstream HAVE_SSTREAM)
#check_include_file_cxx(ios HAVE_IOS)
#check_include_file_cxx(locale HAVE_LOCALE)

# defines will be written to configIncludes.h
set(Include_Defines)
foreach(_h_file aspell.h aspell/aspell.h limits.h locale.h
	stdlib.h sys/stat.h sys/time.h sys/types.h sys/utime.h
	sys/socket.h unistd.h inttypes.h utime.h string.h argz.h)
	string(REGEX REPLACE "[/\\.]" "_" _hf ${_h_file})
	string(TOUPPER ${_hf} _HF)
	check_include_files(${_h_file} HAVE_${_HF})
	set(Include_Defines "${Include_Defines}#cmakedefine HAVE_${_HF} 1\n")
endforeach()
check_include_file_cxx(regex HAVE_REGEX)
set(Include_Defines "${Include_Defines}#cmakedefine HAVE_REGEX 1\n")
configure_file(${LYX_CMAKE_DIR}/configIncludes.cmake ${TOP_BINARY_DIR}/configIncludes.h.cmake)
configure_file(${TOP_BINARY_DIR}/configIncludes.h.cmake ${TOP_BINARY_DIR}/configIncludes.h)

# defines will be written to configFunctions.h
set(Function_Defines)
foreach(_f alloca __argz_count __argz_next __argz_stringify
	chmod close _close dcgettext fcntl fork __fsetlocking
	getcwd getegid getgid getpid _getpid gettext getuid lstat lockf mempcpy mkdir _mkdir
	mkfifo open _open pclose _pclose popen _popen putenv readlink
	setenv setlocale strcasecmp stpcpy strdup strerror strtoul tsearch unsetenv wcslen)
  string(TOUPPER ${_f} _UF)
  check_function_exists(${_f} HAVE_${_UF})
  set(Function_Defines "${Function_Defines}#cmakedefine HAVE_${_UF} 1\n")
endforeach()
configure_file(${LYX_CMAKE_DIR}/configFunctions.cmake ${TOP_BINARY_DIR}/configFunctions.h.cmake)
configure_file(${TOP_BINARY_DIR}/configFunctions.h.cmake ${TOP_BINARY_DIR}/configFunctions.h)

check_symbol_exists(alloca "malloc.h" HAVE_SYMBOL_ALLOCA)
check_symbol_exists(asprintf "stdio.h" HAVE_ASPRINTF)
check_symbol_exists(wprintf "stdio.h" HAVE_WPRINTF)
check_symbol_exists(snprintf "stdio.h" HAVE_SNPRINTF)
check_symbol_exists(printf "stdio.h" HAVE_POSIX_PRINTF)
check_symbol_exists(pid_t "sys/types.h" HAVE_PID_T)
check_symbol_exists(intmax_t "inttypes.h" HAVE_INTTYPES_H_WITH_UINTMAX)
check_symbol_exists(uintmax_t "stdint.h" HAVE_STDINT_H_WITH_UINTMAX)
check_symbol_exists(LC_MESSAGES "locale.h" HAVE_LC_MESSAGES)
check_symbol_exists(PATH_MAX "limits.h" HAVE_DEF_PATH_MAX)

check_type_size(intmax_t HAVE_INTMAX_T)
macro_bool_to_01(HAVE_UINTMAX_T HAVE_STDINT_H_WITH_UINTMAX)

check_type_size("long double"  HAVE_LONG_DOUBLE)
check_type_size("long long"  HAVE_LONG_LONG)
check_type_size(wchar_t HAVE_WCHAR_T)
check_type_size(wint_t  HAVE_WINT_T)

if(HUNSPELL_FOUND)
  # check whether hunspell C++ (rather than C) ABI is provided
  set(HunspellTestFile "${CMAKE_BINARY_DIR}/hunspelltest.cpp")
  file(WRITE "${HunspellTestFile}"
  "
  #include <hunspell/hunspell.hxx>

  int main()
  {
    Hunspell sp(\"foo\", \"bar\");
    int i = sp.stem(\"test\").size();
  return(0);
  }
  "
  )

  try_compile(HAVE_HUNSPELL_CXXABI
    "${CMAKE_BINARY_DIR}"
    "${HunspellTestFile}"
    CMAKE_FLAGS
      "-DINCLUDE_DIRECTORIES:STRING=${HUNSPELL_INCLUDE_DIR}"
      "-DCMAKE_CXX_LINK_EXECUTABLE='${CMAKE_COMMAD} echo not linking now...'"
  OUTPUT_VARIABLE  LOG2)

  message(STATUS "HAVE_HUNSPELL_CXXABI = ${HAVE_HUNSPELL_CXXABI}")
  #message(STATUS "LOG2 = ${LOG2}")
  if(LYX_EXTERNAL_HUNSPELL AND LYX_STDLIB_DEBUG AND HAVE_HUNSPELL_CXXABI)
    message(WARNING "Compiling LyX with stdlib-debug and system hunspell libraries may lead to crashes. Consider using -DLYX_STDLIB_DEBUG=OFF or -DLYX_EXTERNAL_HUNSPELL=OFF.")
  endif()
endif()

#check_cxx_source_compiles(
#	"
#	#include <algorithm>
#	using std::count;
#	int countChar(char * b, char * e, char const c)
#	{
#		return count(b, e, c);
#	}
#	int main(){return 0;}
#	"
#HAVE_STD_COUNT)

#check_cxx_source_compiles(
#	"
#	#include <cctype>
#	using std::tolower;
#	int main(){return 0;}
#	"
#CXX_GLOBAL_CSTD)

check_cxx_source_compiles(
	"
	#include <iconv.h>
	// this declaration will fail when there already exists a non const char** version which returns size_t
	double iconv(iconv_t cd,  char **inbuf, size_t *inbytesleft, char **outbuf, size_t *outbytesleft);
	int main() { return 0; }
	"
HAVE_ICONV_CONST)

check_cxx_source_compiles(
	"
	int i[ ( sizeof(wchar_t)==2 ? 1 : -1 ) ];
	int main(){return 0;}
	"
SIZEOF_WCHAR_T_IS_2)

check_cxx_source_compiles(
	"
	int i[ ( sizeof(wchar_t)==4 ? 1 : -1 ) ];
	int main(){return 0;}
	"
SIZEOF_WCHAR_T_IS_4)

check_cxx_source_compiles(
	"
	int i[ ( sizeof(long long)>sizeof(long) ? 1 : -1 ) ];
	int main(){return 0;}
	"
SIZEOF_LONG_LONG_GREATER_THAN_SIZEOF_LONG)

check_cxx_source_compiles(
	"
	#include <execinfo.h>
	#include <cxxabi.h>
	int main() {
		void* array[200];
		size_t size = backtrace(array, 200);
		backtrace_symbols(array, size);
		int status = 0;
		abi::__cxa_demangle(\"abcd\", 0, 0, &status);
	}
	"
LYX_CALLSTACK_PRINTING)

# Check whether STL is libstdc++
check_cxx_source_compiles(
	"
	#include <vector>
	int main() {
	#if ! defined(__GLIBCXX__) && ! defined(__GLIBCPP__)
		this is not libstdc++
	#endif
		return(0);
	}
	"
lyx_cv_lib_stdcxx)

# Check whether STL is libstdc++ with C++11 ABI
check_cxx_source_compiles(
	"
	#include <vector>
	int main() {
	#if ! defined(_GLIBCXX_USE_CXX11_ABI) || ! _GLIBCXX_USE_CXX11_ABI
		this is not libstdc++ using the C++11 ABI
	#endif
		return(0);
	}
	"
USE_GLIBCXX_CXX11_ABI)

check_cxx_source_compiles(
	"
	#ifndef __clang__
		this is not clang
	#endif
	int main() {
	  return(0);
	}
	"
lyx_cv_prog_clang)

check_cxx_source_compiles(
  "
  #include <memory>
  using std::make_unique;
  int main() {
    return(0);
  }
  "
HAVE_DEF_MAKE_UNIQUE)

check_cxx_source_compiles(
  "
  #include <mutex>
  static std::once_flag flag;
  int main() {
    std::call_once(flag, [](){ return; });
    return(0);
  }
  "
LYX_USE_STD_CALL_ONCE)

set(USE_LLVM_LIBCPP)
set(STD_STRING_USES_COW)
set(USE_GLIBCXX_CXX11_ABI)
if(lyx_cv_lib_stdcxx)
  if(NOT USE_GLIBCXX_CXX11_ABI)
    set(STD_STRING_USES_COW 1)
  endif()
else()
  if(lyx_cv_prog_clang)
    # use libc++ provided by llvm instead of GNU libstdc++
    set(USE_LLVM_LIBCPP 1)
  endif()
endif()

set(QPA_XCB)
set(HAVE_QT5_X11_EXTRAS)
if(LYX_USE_QT MATCHES "QT5")

  set(CMAKE_REQUIRED_INCLUDES ${Qt5Core_INCLUDE_DIRS})
  set(CMAKE_REQUIRED_FLAGS)
  #message(STATUS "Qt5Core_INCLUDE_DIRS = ${Qt5Core_INCLUDE_DIRS}")
  check_include_file_cxx(QtGui/qtgui-config.h HAVE_QTGUI_CONFIG_H)
  if (HAVE_QTGUI_CONFIG_H)
    set(lyx_qt5_config "QtGui/qtgui-config.h")
  else()
    set(lyx_qt5_config "QtCore/qconfig.h")
  endif()
  check_cxx_source_runs(
    "
    #include <${lyx_qt5_config}>
    #include <string>
    using namespace std;
    string a(QT_QPA_DEFAULT_PLATFORM_NAME);
    int main(int argc, char **argv)
    {
      if (a.compare(\"xcb\") == 0)
	return(0);
      else
	return 1;
    }
    "
    QT_USES_X11)
  set(QPA_XCB ${QT_USES_X11})

  if (Qt5X11Extras_FOUND)
    get_target_property(_x11extra_prop Qt5::X11Extras IMPORTED_CONFIGURATIONS)
    get_target_property(_x11extra_link_libraries Qt5::X11Extras IMPORTED_LOCATION_${_x11extra_prop})
    set(CMAKE_REQUIRED_LIBRARIES ${_x11extra_link_libraries})
    set(CMAKE_REQUIRED_INCLUDES ${Qt5X11Extras_INCLUDE_DIRS})
    set(CMAKE_REQUIRED_FLAGS "${Qt5X11Extras_EXECUTABLE_COMPILE_FLAGS} -fPIC -DQT_NO_VERSION_TAGGING")
    #message(STATUS "CMAKE_REQUIRED_LIBRARIES = ${_x11extra_link_libraries}")
    #message(STATUS "CMAKE_REQUIRED_INCLUDES = ${Qt5X11Extras_INCLUDE_DIRS}")
    #message(STATUS "CMAKE_REQUIRED_FLAGS = ${CMAKE_REQUIRED_FLAGS}")
    check_cxx_source_compiles(
            "
            #include <QtX11Extras/QX11Info>
            int main()
            {
              bool isX11 = QX11Info::isPlatformX11();
            }
            "
      QT_HAS_X11_EXTRAS)
    set(HAVE_QT5_X11_EXTRAS ${QT_HAS_X11_EXTRAS})
    set(LYX_QT5_X11_EXTRAS_LIBRARY ${_x11extra_link_libraries})
  endif()
  if (Qt5WinExtras_FOUND)
    get_target_property(_winextra_prop Qt5::WinExtras IMPORTED_CONFIGURATIONS)
    string(TOUPPER ${CMAKE_BUILD_TYPE} BUILD_TYPE)
    get_target_property(_winextra_link_libraries Qt5::WinExtras IMPORTED_LOCATION_${BUILD_TYPE})
    set(CMAKE_REQUIRED_LIBRARIES ${_winextra_link_libraries})
    set(CMAKE_REQUIRED_INCLUDES ${Qt5WinExtras_INCLUDE_DIRS})
    set(CMAKE_REQUIRED_FLAGS ${Qt5WinExtras_EXECUTABLE_COMPILE_FLAGS})
  endif()
elseif(LYX_USE_QT MATCHES "QT4")
  set(CMAKE_REQUIRED_LIBRARIES ${QT_QTGUI_LIBRARY})
  set(CMAKE_REQUIRED_INCLUDES ${QT_INCLUDES})
  check_cxx_source_compiles(
          "
          #include <QtGui/QX11Info>
          int main()
          {
            QX11Info *qxi = new QX11Info;
            qxi->~QX11Info();
          }
          "
  QT_USES_X11)
else()
  message(FATAL_ERROR "Check for QT_USES_X11: Not handled LYX_USE_QT (= ${LYX_USE_QT})")
endif()