Cmake错误构建lib

Question

我写了一个简单的Protobuf-C库。当编译它到lib时，我有以下错误。

Scanning dependencies of target ArgentumTracer-native
[ 16%] Building C object CMakeFiles/ArgentumTracer-native.dir/src/sources/http_sender.c.o
/Users/rmuhamedgaliev/Projects/ArgentumTracer-native/src/sources/http_sender.c:36:33: warning: incompatible pointer types passing 'in_addr_t *' (aka 'unsigned int *') to parameter of type 'struct in_addr *' [-Wincompatible-pointer-types]
    if ( inet_aton(SERVER_ADDR, &dest.sin_addr.s_addr) == 0 )
                                ^~~~~~~~~~~~~~~~~~~~~
/usr/include/arpa/inet.h:83:47: note: passing argument to parameter here
int              inet_aton(const char *, struct in_addr *);
                                                         ^
1 warning generated.
[ 33%] Building C object CMakeFiles/ArgentumTracer-native.dir/src/sources/main_agent.c.o
[ 50%] Building C object CMakeFiles/ArgentumTracer-native.dir/src/sources/VMInfo.pb-c.c.o
Linking C executable ArgentumTracer-native
[ 50%] Built target ArgentumTracer-native
Scanning dependencies of target argentumtracer
[ 66%] Building C object CMakeFiles/argentumtracer.dir/src/sources/http_sender.c.o
/Users/rmuhamedgaliev/Projects/ArgentumTracer-native/src/sources/http_sender.c:36:33: warning: incompatible pointer types passing 'in_addr_t *' (aka 'unsigned int *') to parameter of type 'struct in_addr *' [-Wincompatible-pointer-types]
    if ( inet_aton(SERVER_ADDR, &dest.sin_addr.s_addr) == 0 )
                                ^~~~~~~~~~~~~~~~~~~~~
/usr/include/arpa/inet.h:83:47: note: passing argument to parameter here
int              inet_aton(const char *, struct in_addr *);
                                                         ^
1 warning generated.
[ 83%] Building C object CMakeFiles/argentumtracer.dir/src/sources/main_agent.c.o
[100%] Building C object CMakeFiles/argentumtracer.dir/src/sources/VMInfo.pb-c.c.o
Linking C shared library libargentumtracer.dylib
Undefined symbols for architecture x86_64:
  "_protobuf_c_message_free_unpacked", referenced from:
      _vminfo__free_unpacked in VMInfo.pb-c.c.o
  "_protobuf_c_message_get_packed_size", referenced from:
      _vminfo__get_packed_size in VMInfo.pb-c.c.o
  "_protobuf_c_message_pack", referenced from:
      _vminfo__pack in VMInfo.pb-c.c.o
  "_protobuf_c_message_pack_to_buffer", referenced from:
      _vminfo__pack_to_buffer in VMInfo.pb-c.c.o
  "_protobuf_c_message_unpack", referenced from:
      _vminfo__unpack in VMInfo.pb-c.c.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [libargentumtracer.dylib] Error 1
make[1]: *** [CMakeFiles/argentumtracer.dir/all] Error 2
make: *** [all] Error 2

CMakeLists.txt

cmake_minimum_required(VERSION 3.1)
project(ArgentumTracer-native)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

FIND_PACKAGE(Java REQUIRED)
FIND_PACKAGE(JNI REQUIRED)
INCLUDE_DIRECTORIES(${JAVA_INCLUDE_PATH})
INCLUDE_DIRECTORIES(${JAVA_INCLUDE_PATH2})

file(GLOB SOURCE_FILES "src/sources/*.c" "src/sources/*.h")

add_executable(ArgentumTracer-native ${SOURCE_FILES})
add_library(argentumtracer SHARED ${SOURCE_FILES})

target_link_libraries(ArgentumTracer-native protobuf-c)

请帮我建立lib。我的版本库放在github中 贮藏室 枝 发展

Answer 1

正如我在评论中所建议的，你需要使用CMake来找到protobuf并将protobuf库添加到你的target_link_libraries中。你确实在链接中明确说明了protobuf-c这个库，但这并不是一个万无一失的方法。为了确保万无一失，你应该试试下面的方法......。

find_package(Protobuf MODULE)
if(NOT PROTOBUF_FOUND)
  message(FATAL_ERROR "-- Protobuf is required!")
endif()

target_link_libraries(ArgentumTracer-native ${PROTOBUF_LIBRARIES})

现在，你可以确定你有正确的库。此外，如果找不到protobuf，当find_package失败时，你就会知道，并有机会给CMake提供真实的位置。