Commit 0612db5f authored by Vicent Marti's avatar Vicent Marti

cmake: Add dependency to LibELF

Add a new a `FindLibElf.cmake` package, and use it to link the main
`libbcc` library against the system's LibELF. This library will be used
to re-implement functionality that was previously dependent on
`binutils`.
parent ff9ff5d6
......@@ -47,6 +47,8 @@ if(NOT DEFINED BCC_KERNEL_MODULES_DIR)
set(BCC_KERNEL_MODULES_DIR "/lib/modules")
endif()
find_package(LibElf REQUIRED)
# Set to non-zero if system installs kernel headers with split source and build
# directories in /lib/modules/`uname -r`/. This is the case for debian and
# suse, to the best of my knowledge.
......
# - 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_path (LIBELF_INCLUDE_DIRS
NAMES
libelf.h
PATHS
/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
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)
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)
mark_as_advanced(LIBELF_INCLUDE_DIRS LIBELF_LIBRARIES ELF_GETSHDRSTRNDX)
......@@ -8,6 +8,7 @@ include_directories(${CMAKE_CURRENT_BINARY_DIR}/frontends/b)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/frontends/b)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/frontends/clang)
include_directories(${LLVM_INCLUDE_DIRS})
include_directories(${LIBELF_INCLUDE_DIRS})
# todo: if check for kernel version
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/compat)
add_definitions(${LLVM_DEFINITIONS})
......@@ -52,8 +53,8 @@ set(clang_libs ${libclangFrontend} ${libclangSerialization} ${libclangDriver} ${
${libclangAST} ${libclangLex} ${libclangBasic})
# Link against LLVM libraries
target_link_libraries(bcc-shared b_frontend clang_frontend ${clang_libs} ${expanded_libs})
target_link_libraries(bcc-static b_frontend clang_frontend bcc-loader-static ${clang_libs} ${expanded_libs})
target_link_libraries(bcc-shared b_frontend clang_frontend ${clang_libs} ${expanded_libs} ${LIBELF_LIBRARIES})
target_link_libraries(bcc-static b_frontend clang_frontend bcc-loader-static ${clang_libs} ${expanded_libs} ${LIBELF_LIBRARIES})
install(TARGETS bcc-shared LIBRARY COMPONENT libbcc
DESTINATION ${CMAKE_INSTALL_LIBDIR})
......
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