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# - Find Dwarf
# Find the dwarf.h header from elf utils
#
# DWARF_INCLUDE_DIR - where to find dwarf.h, etc.
# DWARF_LIBRARIES - List of libraries when using elf utils.
# DWARF_FOUND - True if fdo found.
message(STATUS "Checking availability of DWARF and ELF development libraries")
INCLUDE(CheckLibraryExists)
if (DWARF_INCLUDE_DIR AND LIBDW_INCLUDE_DIR AND DWARF_LIBRARY AND ELF_LIBRARY)
# Already in cache, be silent
set(DWARF_FIND_QUIETLY TRUE)
endif (DWARF_INCLUDE_DIR AND LIBDW_INCLUDE_DIR AND DWARF_LIBRARY AND ELF_LIBRARY)
find_path(DWARF_INCLUDE_DIR dwarf.h
/usr/include
/usr/local/include
/usr/include/libdwarf
~/usr/local/include
)
find_path(LIBDW_INCLUDE_DIR elfutils/libdw.h
/usr/include
/usr/local/include
~/usr/local/include
)
find_library(DWARF_LIBRARY
NAMES dw dwarf
PATHS /usr/lib /usr/local/lib /usr/lib64 /usr/local/lib64 ~/usr/local/lib ~/usr/local/lib64
)
find_library(ELF_LIBRARY
NAMES elf
PATHS /usr/lib /usr/local/lib /usr/lib64 /usr/local/lib64 ~/usr/local/lib ~/usr/local/lib64
)
if (DWARF_INCLUDE_DIR AND LIBDW_INCLUDE_DIR AND DWARF_LIBRARY AND ELF_LIBRARY)
set(DWARF_FOUND TRUE)
set(DWARF_LIBRARIES ${DWARF_LIBRARY} ${ELF_LIBRARY})
set(CMAKE_REQUIRED_LIBRARIES ${DWARF_LIBRARIES})
# check if libdw have the dwfl_module_build_id routine, i.e. if it supports the buildid
# mechanism to match binaries to detached debug info sections (the -debuginfo packages
# in distributions such as fedora). We do it against libelf because, IIRC, some distros
# include libdw linked statically into libelf.
check_library_exists(elf dwfl_module_build_id "" HAVE_DWFL_MODULE_BUILD_ID)
else (DWARF_INCLUDE_DIR AND LIBDW_INCLUDE_DIR AND DWARF_LIBRARY AND ELF_LIBRARY)
set(DWARF_FOUND FALSE)
set(DWARF_LIBRARIES)
endif (DWARF_INCLUDE_DIR AND LIBDW_INCLUDE_DIR AND DWARF_LIBRARY AND ELF_LIBRARY)
if (DWARF_FOUND)
if (NOT DWARF_FIND_QUIETLY)
message(STATUS "Found dwarf.h header: ${DWARF_INCLUDE_DIR}")
message(STATUS "Found elfutils/libdw.h header: ${LIBDW_INCLUDE_DIR}")
message(STATUS "Found libdw library: ${DWARF_LIBRARY}")
message(STATUS "Found libelf library: ${ELF_LIBRARY}")
endif (NOT DWARF_FIND_QUIETLY)
else (DWARF_FOUND)
if (DWARF_FIND_REQUIRED)
# Check if we are in a Red Hat (RHEL) or Fedora system to tell
# exactly which packages should be installed. Please send
# patches for other distributions.
find_path(FEDORA fedora-release /etc)
find_path(REDHAT redhat-release /etc)
if (FEDORA OR REDHAT)
if (NOT DWARF_INCLUDE_DIR OR NOT LIBDW_INCLUDE_DIR)
message(STATUS "Please install the elfutils-devel package")
endif (NOT DWARF_INCLUDE_DIR OR NOT LIBDW_INCLUDE_DIR)
if (NOT DWARF_LIBRARY)
message(STATUS "Please install the elfutils-libs package")
endif (NOT DWARF_LIBRARY)
if (NOT ELF_LIBRARY)
message(STATUS "Please install the elfutils-libelf package")
endif (NOT ELF_LIBRARY)
else (FEDORA OR REDHAT)
if (NOT DWARF_INCLUDE_DIR)
message(STATUS "Could NOT find dwarf include dir")
endif (NOT DWARF_INCLUDE_DIR)
if (NOT LIBDW_INCLUDE_DIR)
message(STATUS "Could NOT find libdw include dir")
endif (NOT LIBDW_INCLUDE_DIR)
if (NOT DWARF_LIBRARY)
message(STATUS "Could NOT find libdw library")
endif (NOT DWARF_LIBRARY)
if (NOT ELF_LIBRARY)
message(STATUS "Could NOT find libelf library")
endif (NOT ELF_LIBRARY)
endif (FEDORA OR REDHAT)
message(FATAL_ERROR "Could NOT find some ELF and DWARF libraries, please install the missing packages")
endif (DWARF_FIND_REQUIRED)
endif (DWARF_FOUND)
mark_as_advanced(DWARF_INCLUDE_DIR LIBDW_INCLUDE_DIR DWARF_LIBRARY ELF_LIBRARY)
include_directories(${DWARF_INCLUDE_DIR} ${LIBDW_INCLUDE_DIR})
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/config.h.cmake ${CMAKE_CURRENT_SOURCE_DIR}/config.h)
message(STATUS "Checking availability of DWARF and ELF development libraries - done")
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