Add FindLibElf.cmake

CMakeLists.txt

@@ -29,6 +29,10 @@ ExternalProject_Add(bcc
   BUILD_COMMAND ${CMAKE_COMMAND} --build . --target bcc-static
 )
 
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
+find_package(LibElf REQUIRED)
+include_directories(${LIBELF_INCLUDE_DIRS})
+
 find_package(BISON REQUIRED)
 find_package(FLEX REQUIRED)
 bison_target(bison_parser src/parser.yy ${CMAKE_BINARY_DIR}/parser.tab.cc)

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_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)

src/CMakeLists.txt

@@ -31,4 +31,4 @@ include_directories(${source_dir}/src/cc)
 target_link_libraries(bpftrace ${binary_dir}/src/cc/libbpf.a)
 target_link_libraries(bpftrace ${binary_dir}/src/cc/libbcc-loader-static.a)
 target_link_libraries(bpftrace ${binary_dir}/src/cc/libbcc.a)
-target_link_libraries(bpftrace ${CMAKE_CURRENT_SOURCE_DIR}/../../../../../../../usr/lib/x86_64-linux-gnu/libelf.a)
+target_link_libraries(bpftrace ${LIBELF_LIBRARIES})

tests/CMakeLists.txt

@@ -29,8 +29,7 @@ include_directories(${source_dir}/src/cc)
 target_link_libraries(bpftrace_test ${binary_dir}/src/cc/libbpf.a)
 target_link_libraries(bpftrace_test ${binary_dir}/src/cc/libbcc-loader-static.a)
 target_link_libraries(bpftrace_test ${binary_dir}/src/cc/libbcc.a)
-target_link_libraries(bpftrace_test /usr/lib/x86_64-linux-gnu/libelf.a)
-target_link_libraries(bpftrace_test /usr/lib/x86_64-linux-gnu/libz.a)
+target_link_libraries(bpftrace_test ${LIBELF_LIBRARIES})
 
 find_package(Threads REQUIRED)