cmake/modules/FindLibBfd.cmake

0001 # - Try to find libbfd
0002 # Once done this will define
0003 #
0004 #  LIBBFD_FOUND - system has libbfd
0005 #  LIBBFD_INCLUDE_DIRS - the libbfd include directory
0006 #  LIBBFD_LIBRARIES - Link these to use libbfd
0007 #  LIBBFD_DEFINITIONS - Compiler switches required for using libbfd
0008 #  LIBIBERTY_LIBRARIES - libiberty static library (for static compilation)
0009 #  LIBZ_LIBRARIES - libz static library (for static compilation)
0010
0011 #if (LIBBFD_LIBRARIES AND LIBBFD_INCLUDE_DIRS)
0012 #  set (LibBpf_FIND_QUIETLY TRUE)
0013 #endif (LIBBFD_LIBRARIES AND LIBBFD_INCLUDE_DIRS)
0014
0015 find_path (LIBBFD_INCLUDE_DIRS
0016   NAMES
0017     bfd.h
0018   PATHS
0019     ENV CPATH)
0020
0021 find_library (LIBBFD_LIBRARIES
0022   NAMES
0023     bfd
0024   PATHS
0025     ENV LIBRARY_PATH
0026     ENV LD_LIBRARY_PATH)
0027
0028 # libbfd.so is statically linked with libiberty.a but libbfd.a
0029 # is not. So if we do a static bpftrace build, we must link in
0030 # libiberty.a
0031 find_library (LIBIBERTY_LIBRARIES
0032   NAMES
0033     libiberty.a
0034   PATHS
0035     ENV LIBRARY_PATH
0036     ENV LD_LIBRARY_PATH)
0037
0038 include (FindPackageHandleStandardArgs)
0039
0040
0041 # handle the QUIETLY and REQUIRED arguments and set LIBBFD_FOUND to TRUE if all listed variables are TRUE
0042 FIND_PACKAGE_HANDLE_STANDARD_ARGS(LibBfd "Please install the libbfd development package"
0043   LIBBFD_LIBRARIES
0044   LIBBFD_INCLUDE_DIRS)
0045
0046 mark_as_advanced(LIBBFD_INCLUDE_DIRS LIBBFD_LIBRARIES)
0047
0048 if(${LIBBFD_FOUND})
0049 find_package(LibOpcodes)
0050 SET(CMAKE_REQUIRED_LIBRARIES ${LIBBFD_LIBRARIES} ${LIBOPCODES_LIBRARIES})
0051 # libbfd.a is not statically linked with libiberty.a or libz.a so we must manually
0052 # do it. Furthermore, libbfd uses some libc symbols that we must manually
0053 # link against if we're not using static libc (which includes such symbols).
0054 if(STATIC_LINKING)
0055   find_package(LibZ)
0056   list(APPEND CMAKE_REQUIRED_LIBRARIES ${LIBIBERTY_LIBRARIES} ${LIBZ_LIBRARIES})
0057   if(NOT STATIC_LIBC)
0058     set(CMAKE_REQUIRED_FLAGS
0059       "-Wl,--start-group -Wl,-Bdynamic -Wl,-Bdynamic -lpthread -Wl,-Bdynamic -ldl")
0060   endif()
0061 endif()
0062 INCLUDE(CheckCXXSourceCompiles)
0063 CHECK_CXX_SOURCE_COMPILES("
0064 #include <string.h>
0065 // See comment in bfd-disasm.cpp for why this needs to exist
0066 #define PACKAGE \"bpftrace-test\"
0067 #include <bfd.h>
0068 #include <dis-asm.h>
0069 int main(void) {
0070   bfd *abfd = bfd_openr(NULL, NULL);
0071
0072   disassembler(bfd_get_arch(abfd),
0073                bfd_big_endian(abfd),
0074                bfd_get_mach(abfd),
0075                abfd);
0076   return 0;
0077 }" LIBBFD_DISASM_FOUR_ARGS_SIGNATURE)
0078 SET(CMAKE_REQUIRED_LIBRARIES)
0079 endif()