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# - Try to find libdwarf
# Once done this will define
#
# LIBDWARF_FOUND - system has libdwarf
# LIBDWARF_INCLUDE_DIRS - the libdwarf include directory
# LIBDWARF_LIBRARIES - Link these to use libdwarf
# LIBDWARF_DEFINITIONS - Compiler switches required for using libdwarf
#
# Locate libelf library at first
if (NOT LIBELF_FOUND)
find_package (LibElf REQUIRED)
endif (NOT LIBELF_FOUND)
if (LIBDWARF_LIBRARIES AND LIBDWARF_INCLUDE_DIRS)
set (LibDwarf_FIND_QUIETLY TRUE)
endif (LIBDWARF_LIBRARIES AND LIBDWARF_INCLUDE_DIRS)
find_path (DWARF_INCLUDE_DIR
NAMES
libdwarf.h dwarf.h
PATHS
/usr/include
/usr/include/libdwarf
/usr/local/include
/usr/local/include/libdwarf
/opt/local/include
/sw/include
ENV CPATH) # PATH and INCLUDE will also work
if (DWARF_INCLUDE_DIR)
set (LIBDWARF_INCLUDE_DIRS ${DWARF_INCLUDE_DIR})
endif ()
find_library (LIBDWARF_LIBRARIES
NAMES
dwarf libdwarf
PATHS
/usr/lib
/usr/local/lib
/opt/local/lib
/sw/lib
ENV LIBRARY_PATH # PATH and LIB will also work
ENV LD_LIBRARY_PATH)
include (FindPackageHandleStandardArgs)
# handle the QUIETLY and REQUIRED arguments and set LIBDWARF_FOUND to TRUE
# if all listed variables are TRUE
FIND_PACKAGE_HANDLE_STANDARD_ARGS(LibDwarf DEFAULT_MSG
LIBDWARF_LIBRARIES
LIBDWARF_INCLUDE_DIRS)
if (LIBDWARF_LIBRARIES AND LIBDWARF_INCLUDE_DIRS)
set(CMAKE_REQUIRED_INCLUDES ${LIBDWARF_INCLUDE_DIRS})
set(CMAKE_REQUIRED_LIBRARIES ${LIBDWARF_LIBRARIES} ${LIBELF_LIBRARIES})
# libdwarf makes breaking changes occasionally and doesn't provide an easy
# way to test for them. The following checks should detect the changes and
# pass that information on accordingly.
INCLUDE(CheckCXXSourceCompiles)
INCLUDE(CheckFunctionExists)
MACRO(CHECK_LIBDWARF_INIT init params var)
# Check for the existence of this particular init function.
unset(INIT_EXISTS CACHE)
CHECK_FUNCTION_EXISTS(${init} INIT_EXISTS)
if (INIT_EXISTS)
set(LIBDWARF_USE_INIT_C ${var})
# Check to see if we can use a const name.
unset(DW_CONST CACHE)
if (NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
# -std=c++11 is already set in HPHPCompiler.cmake, don't
# add -std=c++0x on top of that or clang will give errors
set(CMAKE_REQUIRED_FLAGS "-std=c++0x")
endif()
CHECK_CXX_SOURCE_COMPILES("
#include <libdwarf.h>
#include <cstddef>
int dwarfCallback(const char * a, int b, Dwarf_Unsigned c,
Dwarf_Unsigned d, Dwarf_Unsigned e, Dwarf_Unsigned f,
Dwarf_Unsigned * g, Dwarf_Ptr h, int * i) {}
int main() { ${init}(${params}); return 0; }" DW_CONST)
if (DW_CONST)
set(LIBDWARF_CONST_NAME 1)
else()
set(LIBDWARF_CONST_NAME 0)
endif()
endif()
ENDMACRO(CHECK_LIBDWARF_INIT)
# Order is important, last one is used.
CHECK_LIBDWARF_INIT("dwarf_producer_init"
"0, dwarfCallback, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr" 0)
CHECK_LIBDWARF_INIT("dwarf_producer_init_c" "0, dwarfCallback, nullptr, nullptr, nullptr, nullptr" 1)
endif()
if(LIBDWARF_CONST_NAME)
message(STATUS "libdwarf uses const char* type")
else()
message(STATUS "libdwarf uses char* type")
endif()
if(LIBDWARF_USE_INIT_C)
message(STATUS "libdwarf has dwarf_producer_init_c")
else()
message(STATUS "libdwarf does not have dwarf_producer_init_c, using dwarf_producer_init")
endif()
mark_as_advanced(LIBDW_INCLUDE_DIR DWARF_INCLUDE_DIR)
mark_as_advanced(LIBDWARF_INCLUDE_DIRS LIBDWARF_LIBRARIES)
mark_as_advanced(LIBDWARF_CONST_NAME LIBDWARF_USE_INIT_C)
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