帮助构建 boost asio ssl 示例
我一直在研究 asio ssl 示例（链接如下）。尽管尽了最大努力，我还是无法将 openssl 链接到 boost 示例中。 ld 的输出是 ld 缺少 libssl.a 中的符号。我无法弄清楚的是，我发现 libssl.a 中带有 nm 的所有符号都丢失了。我怀疑我在做一些愚蠢的事情，但我对 C++ 不够熟悉来解决它。我还包括了我的 makefile。 ssl-client.cpp 的来源是链接中的逐字来源。
http://www.boost。 org/doc/libs/1_41_0/doc/html/boost_asio/example/ssl/client.cpp
INCLUDES = -I /usr/local/boost_1_41_0/ -I /opt/local/include/
LIBS = -L/usr/local/boost_1_41_0/lib/libboost_system.a \
-L/opt/local/lib/libcrypto.a \
-L/opt/local/lib/libssl.a
CPP = g++
build: ssl-client
ssl-client: ssl-client.cpp
$(CPP) $(LIBS) $(INCLUDES) ssl-client.cpp
I have been working through the asio ssl examples (linked below). Despite by best efforts I have been unable to link openssl into the boost example. The output from ld is that ld is missing symbols from libssl.a. The thing that I can not figure out is that I found all the symbols in libssl.a with nm that ld says are missing. I suspect I am doing something dumb but I am not familiar enough with c++ to fix it. I have also included my makefile. The source of ssl-client.cpp is verbatim from the link.
http://www.boost.org/doc/libs/1_41_0/doc/html/boost_asio/example/ssl/client.cpp
INCLUDES = -I /usr/local/boost_1_41_0/ -I /opt/local/include/
LIBS = -L/usr/local/boost_1_41_0/lib/libboost_system.a \
-L/opt/local/lib/libcrypto.a \
-L/opt/local/lib/libssl.a
CPP = g++
build: ssl-client
ssl-client: ssl-client.cpp
$(CPP) $(LIBS) $(INCLUDES) ssl-client.cpp
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我认为您误解了
-L选项的工作原理。-L指定搜索库的路径。要指定要链接到的单个库，请使用-l选项并省略“lib”前缀，如下所示：此外，
-I之间通常没有空格包括路径选项和实际路径。我不确定其中的空格是否会导致问题，但为了安全起见，您可能会尝试这样做：另外，正如我的评论中所述，您定义了 LIBS 变量，但随后使用了 <代码>LIB变量。对 g++ 的调用应如下所示：
I think you've misunderstood how the
-Loption works.-Lspecifies a path in which to search for libraries. To specify an individual library to link to, use the-loption and omit the "lib" prefix, as follows:Also, there is usually no space between the
-Iinclude path option and the actual path. I'm not sure if a space in there causes problems, but you might try this to be on the safe side:Also, as noted in my comment, you defined the
LIBSvariable but then used theLIBvariable. The call to g++ should be as follows: