[openssl-dev] compile error

[Song Geng]

Hi,

Finally I found the reason. The program find lib “crypto” in the default path. And my system has installed a openssl-0.98. That version doesn’t support “gcm”.

I installed a new version openssl from source code, but it only generate libcrypto.a in directory “lib/“. And I notice that there’s the libcrypto.dylib in /usr/lib. So I use brew to install the latest openssl in from the repo. Then use command as follows:

 cc -g -L/path/to/brew repo/openssl/1.0.2a-1/lib/ -Wall -I../../include  -o test aesgcm.c  -lcrypto

It works.

Br, Great Soul
soul.great at me.com





> On Jul 24, 2015, at 7:52 PM, Stefan.Neis at t-online.de wrote:
> 
> > And I use both gcc and clang with command “cc -g -Wall -I../../include -lcrypto aesgcm.c" to compile the source code.
> Long version:
> Note that the linker processes its libraries from left to right, e.g. if you have an object file object.o and to libraries
> liba.a and libb.a, then "cc object.o -la -lb" will first collect all unresolved symbols in the object files, then it will
> resolve whatever it can resolve with the files in liba.a, possibly adding new unresolved symbols and finally it
> will try to resolve the remaining symbols with libb.a. If you do "cc object.o -lb -la", it will again start with the
> symbols from object.o, resolve what it can against libb.a, then resolve the reamaining stuff against liba.a and
> if it adds any symbol from liba.a that needs something from libb.a you get an error.
> If you do "cc -lb -la object.o", it will start with no symbols, add whatever it needs to resolve the symbols from
> libb.a (i.e. nothing), then adds whatever it needs from liba.a (i.e. nothing), then add object.o and complain
> about everything that remains unresolved.
>  
> In short: try "cc ... aesgcm.c -lcrypto", that should work.
>  
>         Regards,
>                   Stefan
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