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我正在使用 nanomsg 进行请求/接收，当我使用 Makefile 编译它时，我的代码工作得很好。但是，当我尝试使用 cmake 时，它​​编译得很好，但在尝试发送消息时会遇到分段错误。

有谁知道发生了什么？我也不确定问题出在我的 cmake 文件还是 .cc 文件中。

这是一个最小的工作示例。

request.cc（这里省略了它的 .h 文件）

Requester::Requester(const char* url) {
  int socket = nn_socket(AF_SP, NN_REQ);
  assert(socket >= 0);
  assert(nn_connect (socket, url) >= 0);
}

Requester::~Requester() {
  nn_shutdown(socket, 0);
}

const char* Requester::request_for_sentence(const char* sentence){

  int size_sentence = strlen(sentence) + 1;
  int bytes = nn_send(socket, sentence, size_sentence, 0); # segmentation fault occurs here
  assert(bytes == size_sentence);
  char *buf = NULL;
  bytes = nn_recv(socket, &buf, NN_MSG, 0);
  assert(bytes >= 0);
  printf("REQUESTER RECEIVED %s\n", buf);
  return buf;
}

request_test.cc

int main(int argc, char** argv) {
  extractor::Requester my_requester("ipc:///tmp/extractor.ipc");
  const char* output = my_requester.request_for_sentence("some input");
  cerr << "output: " << output << endl;
  return 0;
}

接收者.cc

int main(int argc, char** argv) {
  const char* url = "ipc:///tmp/extractor.ipc";
  int socket = nn_socket (AF_SP, NN_REP);
  assert(socket >= 0);
  assert(nn_bind (socket, url) >= 0); 
  while(1){

    char *buf = NULL;
    int bytes = nn_recv(socket, &buf, NN_MSG, 0);
    assert (bytes >= 0);

    const char* grammar_for_sentence = extract_for_sentence(buf);

    cerr << grammar_for_sentence << endl;

    int size_grammar = strlen(grammar_for_sentence) + 1; // '\0' too
    bytes = nn_send(socket, grammar_for_sentence, size_grammar, 0);
    assert(bytes == size_grammar);

    nn_freemsg (buf);
  }

  return 0;
}

有效的Makefile：

CC=g++
CFLAGS = -L$HOME/opt/lib -I$HOME/opt/include -lnanomsg

all : run_test run_extract_daemon

run_test : extract_request_test.cc extract_request.o
    $(CC) $(CFLAGS) -o run_test extract_request_test.cc extract_request.o -I.

run_extract_daemon : extract_daemon.cc
    $(CC) $(CFLAGS) -o run_extract_daemon extract_daemon.cc

extract_request.o : extract_request.cc extract_request.h
    $(CC) $(CFLAGS) -c extract_request.cc
clean :
    rm run_test run_extract_daemon extract_request.o

不起作用的 CMakeLists.txt：

find_package(nanomsg)
if(NANOMSG_FOUND)
  include_directories(${NANOMSG_INCLUDE_DIR})    
  set(extract_request_test_SRCS extract_request_test.cc)
  add_executable(run_extractor_request_test ${extract_request_test_SRCS})
  target_link_libraries(run_extractor_request_test extractor ${NANOMSG_LIBRARIES})

  set(extract_daemon_SRCS extract_daemon.cc)
  add_executable(run_daemon ${extract_daemon_SRCS})
  target_link_libraries(run_daemon extractor ${NANOMSG_LIBRARIES})
endif(NANOMSG_FOUND)

set(extractor_STAT_SRCS
    extract_request.cc
    extract_request.h)


add_library(extractor STATIC ${extractor_STAT_SRCS})
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