Question

我是关于编码的新手，我遇到了这个问题：我需要编译一个使用openMP和openSSL的C程序。我使用Homebrew安装openSSL得到这个：

如果您构建自己的软件并且需要此公式，那么您将会这样做需要添加到您的构建变量：
LDFLAGS:  -L/usr/local/opt/openssl/lib
CPPFLAGS: -I/usr/local/opt/openssl/include

然后我使用了以下命令

gcc-4.9 -std=c99 -fopenmp main.c -L/usr/local/opt/openssl/lib -lssl

我收到以下错误

Undefined symbols for architecture x86_64:   "_CRYPTO_free", referenced from:
      _openmp_thread_cleanup in ccESSonD.o   "_CRYPTO_malloc", referenced from:
      _openmp_thread_setup in ccESSonD.o   "_CRYPTO_num_locks", referenced from:
      _openmp_thread_setup in ccESSonD.o
      _openmp_thread_cleanup in ccESSonD.o   "_CRYPTO_set_id_callback", referenced from:
      _openmp_thread_setup in ccESSonD.o
      _openmp_thread_cleanup in ccESSonD.o   "_CRYPTO_set_locking_callback", referenced from:
      _openmp_thread_setup in ccESSonD.o
      _openmp_thread_cleanup in ccESSonD.o   "_ERR_free_strings", referenced from:
      _cleanup_EVP in ccESSonD.o   "_ERR_load_crypto_strings", referenced from:
      _init_EVP in ccESSonD.o   "_ERR_print_errors_fp", referenced from:
      _handleErrors in ccESSonD.o   "_EVP_CIPHER_CTX_cleanup", referenced from:
      _getAllRandomness in ccESSonD.o   "_EVP_CIPHER_CTX_init", referenced from:
      _setupAES in ccESSonD.o   "_EVP_EncryptInit_ex", referenced from:
      _setupAES in ccESSonD.o   "_EVP_EncryptUpdate", referenced from:
      _getAllRandomness in ccESSonD.o   "_EVP_aes_128_ctr", referenced from:
      _setupAES in ccESSonD.o   "_EVP_cleanup", referenced from:
      _cleanup_EVP in ccESSonD.o   "_OPENSSL_add_all_algorithms_noconf", referenced from:
      _init_EVP in ccESSonD.o   "_OPENSSL_config", referenced from:
      _init_EVP in ccESSonD.o   "_RAND_bytes", referenced from:
      _main in ccESSonD.o   "_SHA256_Final", referenced from:
      _H in ccESSonD.o
      _H3 in ccESSonD.o   "_SHA256_Init", referenced from:
      _H in ccESSonD.o
      _H3 in ccESSonD.o   "_SHA256_Update", referenced from:
      _H in ccESSonD.o
      _H3 in ccESSonD.o ld: symbol(s) not found for architecture x86_64  collect2: error: ld returned 1 exit status

我做错了什么?????

Answer 1

再次使用-lcrypto选项

Answer 2

gcc-4.9 -std = c99 -fopenmp main.c -L / usr / local / opt / openssl / lib -lssl

CPPFLAGS是预处理器的标志。您需要在C中将-I/usr/local/opt/openssl/include添加到CFLAGS或在C ++中添加CXXFLAFS。编译器驱动程序会将适当的标志传递给预处理器。

如果省略-I/usr/local/opt/openssl/include，那么您将针对OS X的0.9.8标头编译，但链接到Homebrew的1.0.2库。

正如Hanbum所说，你也失踪了-lcrypto。由于链接器是单次传递，因此顺序对于放置库很重要。

所以编译命令应该是：

gcc-4.9 -I/usr/local/opt/openssl/include -std=c99 -fopenmp main.c \
    -L/usr/local/opt/openssl/lib -lssl -lcrypto

我需要编译一个使用openMP和openSSL的C程序。

相关（您的里程可能会有所不同）... OpenMP是获取便携式线程的简便方法。但是，针对Crypto ++（具有OpenMP支持）的基准测试显示，它们减慢了速度，而不是加快速度。

Answer 3

您需要安装64位版本的库。

使用Homebrew OpenSSL和OpenMP在OS X上链接错误

3 个答案: