# Note: copied from https://github.com/facebook/hhvm/blob/master/CMake/FindLibElf.cmake

# - Try to find libelf
# Once done this will define
#
#  LIBELF_FOUND - system has libelf
#  LIBELF_INCLUDE_DIRS - the libelf include directory
#  LIBELF_LIBRARIES - Link these to use libelf
#  LIBELF_DEFINITIONS - Compiler switches required for using libelf
#
#  Copyright (c) 2008 Bernhard Walle <bernhard.walle@gmx.de>
#
#  Redistribution and use is allowed according to the terms of the New
#  BSD license.
#  For details see the accompanying COPYING-CMAKE-SCRIPTS file.
#


if (LIBELF_LIBRARIES AND LIBELF_INCLUDE_DIRS)
  set (LibElf_FIND_QUIETLY TRUE)
endif (LIBELF_LIBRARIES AND LIBELF_INCLUDE_DIRS)

find_package(PkgConfig)
pkg_check_modules(PkgConfig_LibElf QUIET libelf)

find_path (LIBELF_INCLUDE_DIRS
    NAMES
      libelf.h
    PATHS
      ${PkgConfig_LibElf_INCLUDE_DIRS}
      /usr/include
      /usr/include/libelf
      /usr/local/include
      /usr/local/include/libelf
      /opt/local/include
      /opt/local/include/libelf
      /sw/include
      /sw/include/libelf
      ENV CPATH)

find_library (LIBELF_LIBRARIES
    NAMES
      elf
    PATHS
      /usr/lib
      /usr/local/lib
      /opt/local/lib
      /sw/lib
      ${PkgConfig_LibElf_LIBRARY_DIRS}
      ENV LIBRARY_PATH
      ENV LD_LIBRARY_PATH)

include (FindPackageHandleStandardArgs)


# handle the QUIETLY and REQUIRED arguments and set LIBELF_FOUND to TRUE if all listed variables are TRUE
FIND_PACKAGE_HANDLE_STANDARD_ARGS(LibElf DEFAULT_MSG
    LIBELF_LIBRARIES
    LIBELF_INCLUDE_DIRS)

if ( 0 ) #not needed in dynamips
SET(CMAKE_REQUIRED_LIBRARIES elf)
INCLUDE(CheckCXXSourceCompiles)
CHECK_CXX_SOURCE_COMPILES("#include <libelf.h>
int main() {
  Elf *e = (Elf*)0;
  size_t sz;
  elf_getshdrstrndx(e, &sz);
  return 0;
}" ELF_GETSHDRSTRNDX)
endif ()

mark_as_advanced(LIBELF_INCLUDE_DIRS LIBELF_LIBRARIES ELF_GETSHDRSTRNDX)
