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This fails to build with clang. Discovered when updating the port to 1.0.2n for FreeBSD of which I am the maintainer.
cc -I.. -I../include -fPIC -DOPENSSL_PIC -DOPENSSL_THREADS -pthread -D_THREAD_SAFE -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -DL_ENDIAN -O3 -Wall -O2 -fno-strict-aliasing -pipe -march=native -Werror -Qunused-arguments -fstack-protector -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DRC4_ASM -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM -DWHIRLPOOL_ASM -DGHASH_ASM -DECP_NISTZ256_ASM -c fatalerrtest.c -o fatalerrtest.o
fatalerrtest.c:79:47: error: sizeof on pointer operation will return size of 'char *' instead of 'char [80]' [-Werror,-Wsizeof-array-decay]
if ((len = SSL_read(sssl, buf, sizeof(buf - 1))) > 0) {
~~~ ^
fatalerrtest.c:48:9: error: variable 'sssl' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (!SSL_CTX_set_cipher_list(sctx, "AES128-SHA")
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:91:14: note: uninitialized use occurs here
SSL_free(sssl);
^~~~
fatalerrtest.c:48:5: note: remove the 'if' if its condition is always false
if (!SSL_CTX_set_cipher_list(sctx, "AES128-SHA")
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:48:9: error: variable 'sssl' is used uninitialized whenever '||' condition is true [-Werror,-Wsometimes-uninitialized]
if (!SSL_CTX_set_cipher_list(sctx, "AES128-SHA")
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:91:14: note: uninitialized use occurs here
SSL_free(sssl);
^~~~
fatalerrtest.c:48:9: note: remove the '||' if its condition is always false
if (!SSL_CTX_set_cipher_list(sctx, "AES128-SHA")
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:38:9: error: variable 'sssl' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (!create_ssl_ctx_pair(SSLv23_method(), SSLv23_method(), &sctx, &cctx,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:91:14: note: uninitialized use occurs here
SSL_free(sssl);
^~~~
fatalerrtest.c:38:5: note: remove the 'if' if its condition is always false
if (!create_ssl_ctx_pair(SSLv23_method(), SSLv23_method(), &sctx, &cctx,
fatalerrtest.c:48:9: error: variable 'sssl' is used uninitialized whenever '||' condition is true [-Werror,-Wsometimes-uninitialized]
if (!SSL_CTX_set_cipher_list(sctx, "AES128-SHA")
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:91:14: note: uninitialized use occurs here
SSL_free(sssl);
^~~~
fatalerrtest.c:48:9: note: remove the '||' if its condition is always false
if (!SSL_CTX_set_cipher_list(sctx, "AES128-SHA")
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:38:9: error: variable 'sssl' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (!create_ssl_ctx_pair(SSLv23_method(), SSLv23_method(), &sctx, &cctx,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:91:14: note: uninitialized use occurs here
SSL_free(sssl);
^~~~
fatalerrtest.c:38:5: note: remove the 'if' if its condition is always false
if (!create_ssl_ctx_pair(SSLv23_method(), SSLv23_method(), &sctx, &cctx,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:17:14: note: initialize the variable 'sssl' to silence this warning
SSL *sssl, *cssl;
^
= NULL
fatalerrtest.c:48:9: error: variable 'cssl' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (!SSL_CTX_set_cipher_list(sctx, "AES128-SHA")
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:92:14: note: uninitialized use occurs here
SSL_free(cssl);
^~~~
fatalerrtest.c:48:5: note: remove the 'if' if its condition is always false
if (!SSL_CTX_set_cipher_list(sctx, "AES128-SHA")
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:48:9: error: variable 'cssl' is used uninitialized whenever '||' condition is true [-Werror,-Wsometimes-uninitialized]
if (!SSL_CTX_set_cipher_list(sctx, "AES128-SHA")
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:92:14: note: uninitialized use occurs here
SSL_free(cssl);
^~~~
fatalerrtest.c:48:9: note: remove the '||' if its condition is always false
if (!SSL_CTX_set_cipher_list(sctx, "AES128-SHA")
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:38:9: error: variable 'cssl' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
if (!create_ssl_ctx_pair(SSLv23_method(), SSLv23_method(), &sctx, &cctx,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:92:14: note: uninitialized use occurs here
SSL_free(cssl);
^~~~
fatalerrtest.c:38:5: note: remove the 'if' if its condition is always false
if (!create_ssl_ctx_pair(SSLv23_method(), SSLv23_method(), &sctx, &cctx,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatalerrtest.c:17:21: note: initialize the variable 'cssl' to silence this warning
SSL *sssl, *cssl;
^
= NULL
7 errors generated.
*** Error code 1
Stop.
make[3]: stopped in /usr/ports/security/openssl/work/openssl-1.0.2n/test
*** Error code 1
Stop.
make[2]: stopped in /usr/ports/security/openssl/work/openssl-1.0.2n
*** Error code 1
Stop.
FreeBSD 11.1 amd64
clang 4.0.0
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