fix CMakefile for lua

Issue #1621 reported an issue where bcc-lua has an unresolved
symbol bcc_resolve_symname. This is a side effect of previous
cmake file refactorization which permits better control
over what features can be enabled during build time.
The refactorization caused some symbols in bcc_syms.cc
got lost in the final link which produced bcc-lua.

This patch fixed the issue by add a new static library target
bcc-lua-static and adds bcc_syms.cc to it when the library
is created and hence preserved the symbol.

Also removed unnecessary linking for clang_frontend library.
Signed-off-by: Yonghong Song <yhs@fb.com>

src/cc/CMakeLists.txt

@@ -52,6 +52,8 @@ target_link_libraries(bcc-loader-static elf)
 add_library(bcc-static STATIC
   ${bcc_common_sources} ${bcc_table_sources} ${bcc_util_sources})
 set_target_properties(bcc-static PROPERTIES OUTPUT_NAME bcc)
+add_library(bcc-lua-static STATIC
+  ${bcc_common_sources} ${bcc_table_sources} ${bcc_sym_sources} ${bcc_util_sources})
 
 include(clang_libs)
 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${clang_lib_exclude_flags}")
@@ -62,6 +64,7 @@ set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${llvm_lib_exclude_f
 set(bcc_common_libs_for_a b_frontend clang_frontend bpf-static
   ${clang_libs} ${llvm_libs} ${LIBELF_LIBRARIES})
 set(bcc_common_libs_for_s ${bcc_common_libs_for_a})
+set(bcc_common_libs_for_lua ${bcc_common_libs_for_a})
 
 if(ENABLE_CPP_API)
   add_subdirectory(api)
@@ -74,6 +77,7 @@ if(ENABLE_USDT)
   add_subdirectory(usdt)
   list(APPEND bcc_common_libs_for_a usdt-static)
   list(APPEND bcc_common_libs_for_s usdt-static)
+  list(APPEND bcc_common_libs_for_lua usdt-static)
 endif()
 
 add_subdirectory(frontends)
@@ -81,6 +85,7 @@ add_subdirectory(frontends)
 # Link against LLVM libraries
 target_link_libraries(bcc-shared ${bcc_common_libs_for_s})
 target_link_libraries(bcc-static ${bcc_common_libs_for_a} bcc-loader-static)
+target_link_libraries(bcc-lua-static ${bcc_common_libs_for_lua})
 
 install(TARGETS bcc-shared LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
 install(FILES ${bcc_table_headers} DESTINATION include/bcc)

src/cc/frontends/clang/CMakeLists.txt

@@ -10,4 +10,3 @@ if(DEFINED BCC_BACKUP_COMPILE)
 endif()
 
 add_library(clang_frontend STATIC loader.cc b_frontend_action.cc tp_frontend_action.cc kbuild_helper.cc ../../common.cc)
-target_link_libraries(clang_frontend bcc-static)

src/lua/CMakeLists.txt

@@ -23,7 +23,7 @@ if (LUAJIT_LIBRARIES AND LUAJIT)
 	add_executable(bcc-lua src/main.c bcc.o)
 	set_target_properties(bcc-lua PROPERTIES LINKER_LANGUAGE C)
 	target_link_libraries(bcc-lua ${LUAJIT_LIBRARIES})
-	target_link_libraries(bcc-lua -Wl,--whole-archive bcc-static -Wl,--no-whole-archive)
+	target_link_libraries(bcc-lua -Wl,--whole-archive bcc-lua-static -Wl,--no-whole-archive)
 	if (NOT COMPILER_NOPIE_FLAG EQUAL "")
 		target_link_libraries(bcc-lua ${COMPILER_NOPIE_FLAG})
 	endif()