C++ 当我链接动态库而不是静态库时，CMake可以工作

当我将动态库与CMake链接时，创建make文件，然后使用make，它会正确编译和构建

当我链接一个静态库时，CMake不会抱怨，但当我运行make时，它会向我抛出一个链接器错误，尽管我所做的只是将

.dylib

替换为同名的

.a

这是链接到静态库的我的CMake文件：

cmake_minimum_required (VERSION 3.0)
add_executable (TEST main.cpp)

include_directories ("${CMAKE_SOURCE_DIR}/Dependencies/libpqxx/include")
target_link_libraries (TEST "${CMAKE_SOURCE_DIR}/Dependencies/libpqxx/lib/libpqxx.a")

有什么想法吗

cmake的输出：

>> cmake .
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/john/Documents/Test/src

make的输出：

>> make
[ 33%] Linking CXX executable TEST
Undefined symbols for architecture x86_64:
  "_PQbackendPID", referenced from:
      pqxx::connection_base::backendpid() const in libpqxx.a(connection_base.o)
  "_PQcancel", referenced from:
      pqxx::connection_base::cancel_query() in libpqxx.a(connection_base.o)
  "_PQclear", referenced from:
      pqxx::internal::clear_result(pg_result const*) in libpqxx.a(result.o)
  "_PQclientEncoding", referenced from:
      pqxx::connection_base::encoding_code() in libpqxx.a(connection_base.o)
  "_PQcmdStatus", referenced from:
      pqxx::result::cmd_status() const in libpqxx.a(result.o)
  "_PQcmdTuples", referenced from:
      pqxx::result::affected_rows() const in libpqxx.a(result.o)
  "_PQconnectPoll", referenced from:
      pqxx::connect_async::do_completeconnect(pg_conn*) in libpqxx.a(connection.o)
  "_PQconnectStart", referenced from:
      pqxx::connect_async::do_startconnect(pg_conn*) in libpqxx.a(connection.o)
  "_PQconnectdb", referenced from:
      pqxx::connectionpolicy::normalconnect(pg_conn*) in libpqxx.a(connection.o)
  "_PQconsumeInput", referenced from:
      pqxx::connection_base::consume_input() in libpqxx.a(connection_base.o)
  "_PQdb", referenced from:
      pqxx::connection_base::dbname() in libpqxx.a(connection_base.o)
  "_PQencryptPassword", referenced from:
      pqxx::encrypt_password(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) in libpqxx.a(connection_base.o)
  "_PQendcopy", referenced from:
      pqxx::connection_base::write_copy_line(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) in libpqxx.a(connection_base.o)
  "_PQerrorMessage", referenced from:
      pqxx::connection_base::err_msg() const in libpqxx.a(connection_base.o)
      pqxx::connectionpolicy::normalconnect(pg_conn*) in libpqxx.a(connection.o)
      pqxx::connect_direct::do_startconnect(pg_conn*) in libpqxx.a(connection.o)
      pqxx::connect_async::do_startconnect(pg_conn*) in libpqxx.a(connection.o)
      pqxx::connect_async::do_completeconnect(pg_conn*) in libpqxx.a(connection.o)
  "_PQescapeByteaConn", referenced from:
      pqxx::connection_base::esc_raw(unsigned char const*, unsigned long) in libpqxx.a(connection_base.o)
  "_PQescapeIdentifier", referenced from:
      pqxx::connection_base::quote_name(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) in libpqxx.a(connection_base.o)
  "_PQescapeStringConn", referenced from:
      pqxx::connection_base::esc(char const*, unsigned long) in libpqxx.a(connection_base.o)
  "_PQexec", referenced from:
      pqxx::connection_base::exec(char const*, int) in libpqxx.a(connection_base.o)
      pqxx::connection_base::add_receiver(pqxx::notification_receiver*) in libpqxx.a(connection_base.o)
  "_PQexecParams", referenced from:
      pqxx::connection_base::parameterized_exec(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, char const* const*, int const*, int const*, int) in libpqxx.a(connection_base.o)
      pqxx::connection_base::exec_params(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, pqxx::internal::params const&) in libpqxx.a(connection_base.o)
  "_PQexecPrepared", referenced from:
      pqxx::connection_base::prepared_exec(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, char const* const*, int const*, int const*, int) in libpqxx.a(connection_base.o)
      pqxx::connection_base::exec_prepared(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, pqxx::internal::params const&) in libpqxx.a(connection_base.o)
  "_PQfinish", referenced from:
      pqxx::connectionpolicy::normalconnect(pg_conn*) in libpqxx.a(connection.o)
      pqxx::connectionpolicy::do_disconnect(pg_conn*) in libpqxx.a(connection.o)
  "_PQfname", referenced from:
      pqxx::result::column_name(unsigned int) const in libpqxx.a(result.o)
  "_PQfnumber", referenced from:
      pqxx::result::column_number(char const*) const in libpqxx.a(row.o)
  "_PQfreeCancel", referenced from:
      (anonymous namespace)::cancel_wrapper::~cancel_wrapper() in libpqxx.a(connection_base.o)
  "_PQfreemem", referenced from:
      pqxx::internal::freepqmem(void const*) in libpqxx.a(util.o)
  "_PQftable", referenced from:
      pqxx::result::column_table(unsigned int) const in libpqxx.a(result.o)
  "_PQftablecol", referenced from:
      pqxx::result::table_column(unsigned int) const in libpqxx.a(result.o)
  "_PQftype", referenced from:
      pqxx::result::column_type(unsigned int) const in libpqxx.a(result.o)
  "_PQgetCancel", referenced from:
      pqxx::connection_base::cancel_query() in libpqxx.a(connection_base.o)
  "_PQgetCopyData", referenced from:
      pqxx::connection_base::read_copy_line(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >&) in libpqxx.a(connection_base.o)
  "_PQgetResult", referenced from:
      pqxx::connection_base::set_up_state() in libpqxx.a(connection_base.o)
      pqxx::connection_base::read_copy_line(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >&) in libpqxx.a(connection_base.o)
      pqxx::connection_base::end_copy_write() in libpqxx.a(connection_base.o)
      pqxx::connection_base::get_result() in libpqxx.a(connection_base.o)
  "_PQgetisnull", referenced from:
      pqxx::result::get_is_null(unsigned long, unsigned int) const in libpqxx.a(result.o)
  "_PQgetlength", referenced from:
      pqxx::result::get_length(unsigned long, unsigned int) const in libpqxx.a(result.o)
  "_PQgetvalue", referenced from:
      pqxx::result::GetValue(unsigned long, unsigned int) const in libpqxx.a(result.o)
  "_PQhost", referenced from:
      pqxx::connection_base::hostname() in libpqxx.a(connection_base.o)
  "_PQisBusy", referenced from:
      pqxx::connection_base::is_busy() const in libpqxx.a(connection_base.o)
  "_PQisthreadsafe", referenced from:
      pqxx::describe_thread_safety() in libpqxx.a(util.o)
  "_PQnfields", referenced from:
      pqxx::result::columns() const in libpqxx.a(result.o)
  "_PQnotifies", referenced from:
      pqxx::connection_base::get_notifs() in libpqxx.a(connection_base.o)
  "_PQntuples", referenced from:
      pqxx::result::size() const in libpqxx.a(result.o)
      pqxx::result::empty() const in libpqxx.a(result.o)
  "_PQoidValue", referenced from:
      pqxx::result::inserted_oid() const in libpqxx.a(result.o)
  "_PQport", referenced from:
      pqxx::connection_base::port() in libpqxx.a(connection_base.o)
  "_PQprepare", referenced from:
      pqxx::connection_base::register_prepared(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) in libpqxx.a(connection_base.o)
  "_PQprotocolVersion", referenced from:
      pqxx::connection_base::protocol_version() const in libpqxx.a(connection_base.o)
  "_PQputCopyData", referenced from:
      pqxx::connection_base::write_copy_line(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) in libpqxx.a(connection_base.o)
  "_PQputCopyEnd", referenced from:
      pqxx::connection_base::end_copy_write() in libpqxx.a(connection_base.o)
  "_PQreset", referenced from:
      pqxx::connection_base::reset() in libpqxx.a(connection_base.o)
  "_PQresultErrorField", referenced from:
      pqxx::result::ThrowSQLError(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) const in libpqxx.a(result.o)
      pqxx::result::errorposition() const in libpqxx.a(result.o)
  "_PQresultErrorMessage", referenced from:
      pqxx::result::StatusError() const in libpqxx.a(result.o)
  "_PQresultStatus", referenced from:
      pqxx::result::StatusError() const in libpqxx.a(result.o)
  "_PQsendQuery", referenced from:
      pqxx::connection_base::set_up_state() in libpqxx.a(connection_base.o)
      pqxx::connection_base::start_exec(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) in libpqxx.a(connection_base.o)
  "_PQserverVersion", referenced from:
      pqxx::connection_base::read_capabilities() in libpqxx.a(connection_base.o)
  "_PQsetErrorVerbosity", referenced from:
      pqxx::connection_base::set_verbosity(pqxx::connection_base::error_verbosity) in libpqxx.a(connection_base.o)
  "_PQsetNoticeProcessor", referenced from:
      pqxx::connection_base::set_up_state() in libpqxx.a(connection_base.o)
      pqxx::connection_base::close() in libpqxx.a(connection_base.o)
  "_PQsocket", referenced from:
      (anonymous namespace)::socket_of(pg_conn const*) in libpqxx.a(connection_base.o)
  "_PQstatus", referenced from:
      pqxx::connection_base::status() const in libpqxx.a(connection_base.o)
      pqxx::connectionpolicy::normalconnect(pg_conn*) in libpqxx.a(connection.o)
      pqxx::connect_direct::do_startconnect(pg_conn*) in libpqxx.a(connection.o)
      pqxx::connect_async::do_startconnect(pg_conn*) in libpqxx.a(connection.o)
  "_PQtrace", referenced from:
      pqxx::connection_base::internal_set_trace() in libpqxx.a(connection_base.o)
  "_PQunescapeBytea", referenced from:
      pqxx::connection_base::unesc_raw(char const*) in libpqxx.a(connection_base.o)
  "_PQuntrace", referenced from:
      pqxx::connection_base::internal_set_trace() in libpqxx.a(connection_base.o)
  "_PQuser", referenced from:
      pqxx::connection_base::username() in libpqxx.a(connection_base.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]: *** [TEST] Error 1
make[1]: *** [CMakeFiles/TEST.dir/all] Error 2
make: *** [all] Error 2

>制作
[33%]链接CXX可执行测试
架构x86_64的未定义符号：
“_PQbackendPID”，引用自：
pqxx:：connection_base:：libpqxx.a（connection_base.o）中的backendpid（）常量
“取消”，引用自：
pqxx:：connection_base:：取消libpqxx.a（connection_base.o）中的查询（）
“_PQclear”，引用自：
pqxx:：内部：：清除libpqxx.a（result.o）中的结果（pg\u result const*）
“客户编码”，引用自：
pqxx:：connection_base:：在libpqxx.a（connection_base.o）中编码_code（）
“PQcmdStatus”，引用自：
pqxx:：result:：libpqxx.a（result.o）中的cmd_status（）常量
“_PQcmdTuples”，引用自：
pqxx:：result:：libpqxx.a（result.o）中受影响的_行（）常量
“_PQconnectPoll”，引用自：
pqxx:：connect\u async:：在libpqxx.a（connection.o）中完成连接（pg\u conn*）
“_PQconnectStart”，引用自：
pqxx:：connect\u async:：do\u startconnect（pg\u conn*）在libpqxx.a（connection.o）中
“_PQconnectdb”，引用自：
libpqxx.a（connection.o）中的pqxx:：connectionpolicy:：normalconnect（pg_conn*）
“输入”，引用自：
pqxx:：connection_base:：使用libpqxx.a（connection_base.o）中的输入（）
“PQdb”，引用自：
libpqxx.a（connection_base.o）中的pqxx:：connection_base:：dbname（）
“_PQencryptPassword”，引用自：
pqxx:：在libpqxx.a（connection\u base.o）中加密\u密码（std:：\u 1:：basic\u string const&，std:\u 1:：basic\u string const&）
“_PQendcopy”，引用自：
pqxx:：connection_base:：在libpqxx.a（connection_base.o）中写入_copy_行（std:_1:：basic_string const&）
“\u PQerrorMessage”，引用自：
pqxx:：connection_base:：libpqxx.a（connection_base.o）中的err_msg（）常量
libpqxx.a（connection.o）中的pqxx:：connectionpolicy:：normalconnect（pg_conn*）
pqxx:：connect\u direct:：在libpqxx.a（connection.o）中启动连接（pg\u conn*）
pqxx:：connect\u async:：do\u startconnect（pg\u conn*）在libpqxx.a（connection.o）中
pqxx:：connect\u async:：在libpqxx.a（connection.o）中完成连接（pg\u conn*）
“_PQESCAPEBYTECON”，引用自：
pqxx:：connection_base:：libpqxx.a（connection_base.o）中的esc_raw（unsigned char const*，unsigned long）
“\u PQescapeIdentifier”，引用自：
libpqxx.a（connection_base.o）中的pqxx:：connection_base:：quote_name（std:：_1:：basic_string const&）
“\u PQescapeStringConn”，引用自：
pqxx:：connection_base:：libpqxx.a（connection_base.o）中的esc（char const*，unsigned long）
“_PQexec”，引用自：
libpqxx.a（connection_base.o）中的pqxx:：connection_base:：exec（char const*，int）
pqxx:：connection_base:：在libpqxx.a（connection_base.o）中添加_receiver（pqxx:：notification_receiver*）
“_PQexecParams”，引用自：
pqxx:：connection_base:：libpqxx.a（connection_base.o）中的参数化_exec（std:_1:：basic_字符串常量&，char const*const*，int const*，int const*，int）
libpqxx.a（connection_base.o）中的pqxx:：connection_base:：exec_params（std:：_1:：basic_string const&，pqxx:：internal:：params const&）
“准备就绪”，引用自：
pqxx:：connection_base:：在libpqxx.a（connection_base.o）中准备好的_exec（标准：：_1:：basic_string const&，char const*const*，int const*，int const*，int）
libpqxx.a（connection_base.o）中的pqxx:：connection_base:：exec_prepared（标准：：_1:：basic_字符串常量&，pqxx:：internal:：params常量&）
“_PQfinish”，引用自：
libpqxx.a（connection.o）中的pqxx:：connectionpolicy:：normalconnect（pg_conn*）
连接策略：：在libpqxx.a（connection.o）中断开连接（pg\u conn*）
“_PQfname”，引用自：
pqxx:：result:：libpqxx.a（result.o）中的列名称（unsigned int）常量
“_PQfnumber”，引用自：
pqxx:：result:：libpqxx.a（row.o）中的列号（char const*）常量
“取消”，引用自：
（匿名命名空间）：：cancel_wrapper:：~cancel_wrapper（）位于libpqxx.a（connection_base.o）中
“\u PQfreemem”，引用自：
libpqxx.a（util.o）中的pqxx:：internal:：freepqmem（void const*）
“_PQftable”，引用自：
pqxx:：result:：libpqxx.a（result.o）中的列_表（unsigned int）常量
“_PQftablecol”，引用自：
pqxx:：result:：libpqxx.a（result.o）中的表_列（unsigned int）常量
“_PQftype”，引用自：
pqxx:：result:：libpqxx.a（result.o）中的列类型（无符号int）常量
“\u PQgetCancel”，引用自：
pqxx:：connection_base:：取消libpqxx.a（connection_base.o）中的查询（）
“\u PQgetCopyData”，引用自：
pqxx:：connection_base:：读取libpqxx.a（connection_base.o）中的\u copy_行（std:：\uu 1:：basic_string&）
“_PQgetResult”，引用自：
pqxx:：connection_base:：在libpqxx.a（connection_base.o）中设置_-up_-state（）
pqxx:：connection_base:：读取libpqxx.a（connection_base.o）中的\u copy_行（std:：\uu 1:：basic_string&）
pqxx:：connection_base:：end_copy_write（）在libpqxx.a（connection_base.o）中
pqxx:：connection_base:：在libpqxx.a（connection_base.o）中获取结果（）
“_PQgetisnull”，引用自：
pqxx:：result:：get_是libpqxx.a（result.o）中的null（无符号长，无符号整数）常量
“_PQgetlength”，引用自：
pqxx:：result:：获取libpqxx.a（result.o）中的长度（无符号长，无符号整数）常量
“_PQgetvalue”，引用自：
pqxx:：result:：libpqxx.a（result.o）中的GetValue（无符号长，无符号整数）常量
“PQU主机”，引用自：
libpqxx.a（connection_base.o）中的pqxx:：connection_base:：hostname（）
“\u PQisBusy”，引用自：
pqxx:：连接\基础：：忙吗（）
link_directories(${CMAKE_SOURCE_DIR}/Dependencies/libpqxx/lib)
target_link_libraries (TEST pqxx)