CODEWITHSUNDEEP
gccopensslhomebrewosx-yosemite
Eneri
Eneri

Reputation: 11

Link error on OS X using Homebrew OpenSSL and OpenMP

I am new about coding and I have this problem: I need to compile a C program that uses openMP and openSSL. I installed openSSL using Homebrew getting this:

If you build your own software and it requires this formula, you'll need to add to your build variables:

LDFLAGS:  -L/usr/local/opt/openssl/lib
CPPFLAGS: -I/usr/local/opt/openssl/include

and then I used the following command 

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

and I get the following errors

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

What is that I did wrong?????

Upvotes: 1

Views: 1894

Answers (3)

jww
jww

Reputation: 102296

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

CPPFLAGS are flags to the preprocessor. You need to add -I/usr/local/opt/openssl/include to CFLAGS in C or CXXFLAFS in C++. The compiler driver will pass the appropriate flags to the preprocessor.

If you omit -I/usr/local/opt/openssl/include, then you will compile against OS X's 0.9.8 headers, but link against Homebrew's 1.0.2 libraries.

As Hanbum noted, you are also missing -lcrypto. Order matters for the placement of libraries because the linker is single pass.

So you compile command should be:

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

I need to compile a C program that uses openMP and openSSL.

Related (and your mileage may vary)... OpenMP is a easy way to get portable threads. However, benchmarks against Crypto++ (which has OpenMP support) showed they slowed things down, rather than speeding things up.

Upvotes: 2

Fara Importanta
Fara Importanta

Reputation: 161

You need to install the 64-bit version of the library.

Upvotes: 0

hanbumpark
hanbumpark

Reputation: 233

try again with -lcrypto option

Upvotes: 2

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