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Re: Linking with *SSL

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On 13/05/2016 1:33 a.m., Spil Oss wrote:
>> Hi!
>> When we worked on squid port on FreeBSD one of the FreeBSD user
>> (Bernard Spil) noticed:
>>
>> When working on this, I ran into another issue. Perhaps maintainer can
>> fix that with upstream. I've now added LIBOPENSSL_LIBS="-lcrypto
>> -lssl" because of configure failing in configure.ac line 1348.
>>
>>> AC_CHECK_LIB(ssl,[SSL_library_init],[LIBOPENSSL_LIBS="-lssl $LIBOPENSSL_LIBS"],[AC_MSG_ERROR([library 'ssl' is required for OpenSSL])
>>
>> You cannot link against libssl when not linking libcrypto as well
>> leading to an error with LibreSSL. This check should add -lcrypto in
>> addition to -lssl to pass.
>>
>> Is this something someone could take a look at?
> 
> Hi All,
> 
> Sorry for replying out-of-thread.
> 
> What happens is that the check for SSL_library_init fails as -lcrypto
> is missing.
> 
> Output from configure
> 
>> checking for CRYPTO_new_ex_data in -lcrypto... yes
>> checking for SSL_library_init in -lssl... no
>> configure: error: library 'ssl' is required for OpenSSL
>> ===>  Script "configure" failed unexpectedly.
> 
> What I usually see in autoconf scripts is that temp CFLAGS etc are set
> before the test for SSL libs and reversed after the test.
> 
> Adding LIBOPENSSL_LIBS="-lcrypto -lssl" to configure works as well
> 
> Would be great if you can fix this!
> 

Hi, sorry for the long delay. Its been an interesting month.

It seems we need to now stop relying on LIBS being set correctly by
autoconf when consecutive AC_CHECK_LIB are done. I'm trying out a fix
now and which should be in the next releases.

FYI: Squid is increasingly using the pkg-config tool for resolving odd
library dependencies. If it is available this broken check will never be
reached.


Amos

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