帮助建立boost asio ssl示例 [英] Aid in building boost asio ssl example

问题描述

我一直在通过asio ssl示例（链接如下）。尽管最大的努力，我已经无法链接openssl到boost示例。 ld的输出是ld缺少来自libssl.a的符号。我不能想出的事情是，我发现libssl.a中的所有符号与nm，ld说缺失。我怀疑我做一些蠢，但我不熟悉c ++来修复它。我也包括我的makefile。

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 
  

解决方案>

我认为你误解了 -L 选项的工作原理。 -L 指定搜索库的路径。要指定要链接的单个库，请使用 -l <​​/ code>选项并省略lib前缀，如下所示：

  LIBS = -L / usr / local / boost_1_41_0 / lib -L ​​/ opt / local / lib \ 
 -lboost_system -lcrypto -lssl 
  

另外， -I include路径选项之间通常没有空格和实际路径。我不知道是否有空间导致问题，但您可以尝试这是安全的一面：

 包括= -I / usr / local / boost_1_41_0 / -I / opt / local / include / 
  

如我在注释中所述，您定义了 LIBS 变量，但使用了 LIB 变量。对g ++的调用应该如下：

  $（CPP）$（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

解决方案

I think you've misunderstood how the -L option works. -L specifies a path in which to search for libraries. To specify an individual library to link to, use the -l option and omit the "lib" prefix, as follows:

LIBS = -L/usr/local/boost_1_41_0/lib -L/opt/local/lib \
    -lboost_system -lcrypto -lssl

Also, there is usually no space between the -I include 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:

INCLUDES = -I/usr/local/boost_1_41_0/ -I/opt/local/include/

Also, as noted in my comment, you defined the LIBS variable but then used the LIB variable. The call to g++ should be as follows:

$(CPP) $(LIBS) $(INCLUDES) ssl-client.cpp

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