Eclipse C / C ++：外部庫的交叉編譯鏈接器錯誤：Ubuntu VM amd64到Ubuntu armhf（Raspberry Pi）

Question

設定：

主機：-amd64 VM，用於托管安裝了Eclipse Mars x64的Ubuntu Mate 15.10。 還安裝了Linaro x64工具鏈

目標：-armhf Ubuntu Mate 15.10 Raspberry Pi

問題

我試圖交叉編譯我在git上找到的現有代碼，但是由於鏈接器錯誤，我無法這樣做。 該項目有一個已編譯的lib mqtt3as.so，它查找libcrypt和libssl。 鏈接器未找到這些鏈接。 我應該提到我嘗試了以下步驟。

-Git代碼在Raspberry Pi上構建良好

-主機到目標的交叉編譯器可以與Hello_world代碼一起正常工作。 部署和調試工作

-NFS將Raspi的/ lib和/ usr / lib掛載到toolchainx64 / lib文件夾

但沒有任何變化。 我了解此問題與鏈接器找不到庫有關。 我試圖遵循我用Google搜索的所有可能的建議。 以下是主機上eclipse的日志。 如果需要，我可以分享詳細的日志。

從字面上看，現在的想法已經用完了。 我有unix的經驗..但是那是幾年前的事，而且還很新。 如果需要，我仍然可以學習和探索。

---

日志記錄

    18:18:50 **** Build of configuration Default for project prj_c ****
make all 
Building file: ../cJSON.c
Invoking: Cross GCC Compiler
arm-linux-gnueabihf-gcc -I"/home/k/dev/workspace/iot/iot-raspberrypi/samples/c" -O2 -g -Wall -c -fmessage-length=0 -MMD -MP -MF"cJSON.d" -MT"cJSON.o" -o "cJSON.o" "../cJSON.c"
Finished building: ../cJSON.c

Building file: ../cpustat.c
Invoking: Cross GCC Compiler
arm-linux-gnueabihf-gcc -I"/home/k/dev/workspace/iot/iot-raspberrypi/samples/c" -O2 -g -Wall -c -fmessage-length=0 -MMD -MP -MF"cpustat.d" -MT"cpustat.o" -o "cpustat.o" "../cpustat.c"
../cpustat.c: In function ‘GetCPULoad’:
../cpustat.c:68:10: warning: implicit declaration of function ‘sleep’ [-Wimplicit-function-declaration]
          sleep(1);
          ^
../cpustat.c:63:11: warning: unused variable ‘dump’ [-Wunused-variable]
      char dump[50];
           ^
Finished building: ../cpustat.c

Building file: ../iotmain.c
Invoking: Cross GCC Compiler
arm-linux-gnueabihf-gcc -I"/home/k/dev/workspace/iot/iot-raspberrypi/samples/c" -O2 -g -Wall -c -fmessage-length=0 -MMD -MP -MF"iotmain.d" -MT"iotmain.o" -o "iotmain.o" "../iotmain.c"
../iotmain.c: In function ‘main’:
../iotmain.c:75:6: warning: unused variable ‘lckStatus’ [-Wunused-variable]
  int lckStatus;
      ^
../iotmain.c: In function ‘trim’:
../iotmain.c:266:2: warning: implicit declaration of function ‘isspace’ [-Wimplicit-function-declaration]
  while (isspace(*(++frontp)))
  ^
../iotmain.c: In function ‘get_config’:
../iotmain.c:291:17: warning: unused variable ‘str2’ [-Wunused-variable]
  char str1[10], str2[10];
                 ^
../iotmain.c:291:7: warning: unused variable ‘str1’ [-Wunused-variable]
  char str1[10], str2[10];
       ^
Finished building: ../iotmain.c

Building file: ../jsonReader.c
Invoking: Cross GCC Compiler
arm-linux-gnueabihf-gcc -I"/home/k/dev/workspace/iot/iot-raspberrypi/samples/c" -O2 -g -Wall -c -fmessage-length=0 -MMD -MP -MF"jsonReader.d" -MT"jsonReader.o" -o "jsonReader.o" "../jsonReader.c"
Finished building: ../jsonReader.c

Building file: ../jsonator.c
Invoking: Cross GCC Compiler
arm-linux-gnueabihf-gcc -I"/home/k/dev/workspace/iot/iot-raspberrypi/samples/c" -O2 -g -Wall -c -fmessage-length=0 -MMD -MP -MF"jsonator.d" -MT"jsonator.o" -o "jsonator.o" "../jsonator.c"
Finished building: ../jsonator.c

Building file: ../mac.c
Invoking: Cross GCC Compiler
arm-linux-gnueabihf-gcc -I"/home/k/dev/workspace/iot/iot-raspberrypi/samples/c" -O2 -g -Wall -c -fmessage-length=0 -MMD -MP -MF"mac.d" -MT"mac.o" -o "mac.o" "../mac.c"
Finished building: ../mac.c

Building file: ../mqttPublisher.c
Invoking: Cross GCC Compiler
arm-linux-gnueabihf-gcc -I"/home/k/dev/workspace/iot/iot-raspberrypi/samples/c" -O2 -g -Wall -c -fmessage-length=0 -MMD -MP -MF"mqttPublisher.d" -MT"mqttPublisher.o" -o "mqttPublisher.o" "../mqttPublisher.c"
../mqttPublisher.c: In function ‘subscribeMessage’:
../mqttPublisher.c:117:6: warning: unused variable ‘i’ [-Wunused-variable]
  int i;
      ^
../mqttPublisher.c:126:10: warning: ‘command’ may be used uninitialized in this function [-Wmaybe-uninitialized]
   sprintf(command,"sudo /sbin/shutdown -r %d", time_delay);
          ^
Finished building: ../mqttPublisher.c

Building target: prj_c
Invoking: Cross G++ Linker
arm-linux-gnueabihf-g++ -L"/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib" -o "prj_c"  ./cJSON.o ./cpustat.o ./iotmain.o ./jsonReader.o ./jsonator.o ./mac.o ./mqttPublisher.o   -lpaho-mqtt3as
/home/k/dev/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/../lib/gcc/arm-linux-gnueabihf/4.8.3/../../../../arm-linux-gnueabihf/bin/ld: warning: libcrypto.so.1.0.0, needed by /home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so, not found (try using -rpath or -rpath-link)
/home/k/dev/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/../lib/gcc/arm-linux-gnueabihf/4.8.3/../../../../arm-linux-gnueabihf/bin/ld: warning: libssl.so.1.0.0, needed by /home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so, not found (try using -rpath or -rpath-link)
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_get_error@OPENSSL_1.0.0'
makefile:44: recipe for target 'prj_c' failed
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_CTX_load_verify_locations@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_alert_desc_string_long@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_CTX_set_msg_callback@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_get1_session@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_write@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `CRYPTO_THREADID_set_numeric@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `ERR_get_error@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_alert_type_string_long@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_CTX_set_default_passwd_cb@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_CIPHER_get_name@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_load_error_strings@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_CTX_set_default_passwd_cb_userdata@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_new@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `CRYPTO_set_locking_callback@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `OPENSSL_add_all_algorithms_noconf@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_CTX_use_PrivateKey_file@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_library_init@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_get_current_cipher@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_CTX_set_cipher_list@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_CTX_set_default_verify_paths@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_shutdown@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_connect@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_get_cipher_list@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSLv23_client_method@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_CTX_use_certificate_chain_file@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `ERR_print_errors_fp@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_CTX_set_info_callback@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_set_session@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_CTX_new@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `CRYPTO_THREADID_set_callback@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `CRYPTO_num_locks@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_free@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_read@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSLeay_version@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `ERR_load_crypto_strings@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_get_verify_result@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_CTX_free@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_CTX_ctrl@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_pending@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_CTX_set_verify@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_state_string_long@OPENSSL_1.0.0'
/home/k/dev/workspace/iot/iot-raspberrypi/samples/c/lib/libpaho-mqtt3as.so: undefined reference to `SSL_set_fd@OPENSSL_1.0.0'
collect2: error: ld returned 1 exit status
make: *** [prj_c] Error 1

18:18:52 Build Finished (took 1s.675ms)

Answer 1

您在構建系統上缺少2個庫： libcrypto.so.1.0.0和libssl.so.1.0.0 。

開發人員在其存儲庫中添加了一個額外的部分，描述了構建示例所需的內容： 對於要更改代碼，編譯和構建.deb文件的用戶的說明

他們聲明的一件事是，您需要安裝libssl-dev ，它將自動安裝libssl1.0.0 。 該軟件包包含libcrypto.so.1.0.0和libssl.so.1.0.0 。

因此，運行sudo apt-get install libssl-dev可能會解決您的問題。

但是：您不是直接在arm系統上構建代碼，而是在x86 / 64系統上構建代碼。 我不確定鏈接是否可以正常工作。

Answer 2

我能夠正確構建。 自開始以來，始終是鏈接器路徑問題。 但是，由於我缺乏Eclipse和linux的專業知識，因此無法找到原因。 將我的觀察結果發布給其他人。

1. 鏈接器正在尋找libssl.so和libcrypto.so。 而eclipse控制台中的錯誤是尋找libcrypto.1.0.0。 有人可以指導我為什么這個命名問題嗎？
2. 我能夠使用本地lib文件夾以及到外部庫的NFS鏈接進行構建。
3. 與庫-L的鏈接應指向.so的最終文件夾，而不是指向父級或上層目錄。
4. 使用NFS時，由於第1點中提到的問題，我登錄到目標（Raspberry Pi），並通過文件資源管理器>右鍵單擊>建立鏈接將.so.1.0.0鏈接到.so。 該鏈接在主機nfs掛載上顯示為斷開。 也許那是絕對的。 幾乎沒有帶有鏈接的標准庫。
5. 為了在主機上從eclipse進行有效運行，如果遇到錯誤-“加載共享庫時出錯”，則需要將這些庫復制到目標上的/ lib或/ usr / lib。