Re: [CMake] Overriding the include path, library path of OpenSSL, Zlib and libcurl

[Michael Ellery]

after find_package is invoked, several variables will be set. You use these to 
augment your compiler and linker information, e.g.:

target_include_directories(mytarget $ZLIB_INCLUDE_DIRS)
target_link_libraries(mytarget $ZLIB_LIBRARIES)

…and so on for other modules you find (OpenSSL, for example).  You can also 
choose to add the include paths “globally” using include_directories(), but 
it’s usually considered best practice to modify individual target properties 
where possible.

-Mike
..
> On Apr 21, 2017, at 10:58 AM, Alex Chen  wrote:
> 
> Although cmake uses the path I supplied for OpenSSL and Zlib, I do not see 
> the –I flag being used in compiling the code. (I set VERBOSE=1 to make to see 
> what it does.)
> When I run ‘ldd’ against the resulting .so files, reference to libssl.so or 
> libcrypto.so is empty, i.e ‘libssl.so => not found’, but libz.so still links 
> to /lib64/libz.so. (It seems to ignore the fact it does find a new path of 
> zlib.)
>  
> How to I set the linker flag, i.e. –L and –Wl,-rpath=$myLibPath ?
>  
> Alex Chen
>  
> From: CMake  on behalf of Alex Chen 
> 
> Date: Friday, April 21, 2017 at 10:28 AM
> To: CMake 
> Subject: Re: [CMake] Overriding the include path, library path of OpenSSL, 
> Zlib and libcurl
>  
> Thanks for the help.  I will try that. 
>  
> Alex Chen
>  
> From: Michael Ellery 
> Date: Thursday, April 20, 2017 at 8:13 PM
> To: Alex Chen 
> Cc: CMake 
> Subject: Re: [CMake] Overriding the include path, library path of OpenSSL, 
> Zlib and libcurl
>  
> It doesn’t look like that find module directly supports HINTS or PATHS, so 
> you can try setting CMAKE_LIBRARY_PATH and CMAKE_INCLUDE_PATH  
> (https://cmake.org/cmake/help/v3.7/variable/CMAKE_LIBRARY_PATH.html) before 
> calling the curl finder. I think you can add to those variables whatever 
> paths are appropriate to search for CURL on your systems.
>  
> -Mike
>  
>> On Apr 20, 2017, at 6:06 PM, Alex Chen  wrote:
>> The source code I want to compile on Linux uses ‘FindOpenSSL’, ‘FindZLIB’, 
>> and ‘FindCURL’ to resolve the paths of these libraries.
>> However, I have newer version of these libraries in different locations.  
>> How to I override these to use my paths?
>> I am able to use OPENSSL_ROOT_DIR, from FindOpenSSL module, and ZLIB_ROOT, 
>> from FindZLIB module, to override the paths.  
>> But I cannot find anything in FindCURL module to override the path of 
>> libcurl.
>>   
>>   
>> Alex Chen
>> -- 
>> Powered by www.kitware.com
>> Please keep messages on-topic and check the CMake FAQ at: 
>> http://www.cmake.org/Wiki/CMake_FAQ
>> Kitware offers various services to support the CMake community. For more 
>> information on each offering, please visit:
>> CMake Support: http://cmake.org/cmake/help/support.html
>> CMake Consulting: http://cmake.org/cmake/help/consulting.html
>> CMake Training Courses: http://cmake.org/cmake/help/training.html
>> Visit other Kitware open-source projects at 
>> http://www.kitware.com/opensource/opensource.html
>> Follow this link to subscribe/unsubscribe:
>> http://public.kitware.com/mailman/listinfo/cmake
>  
>  
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Re: [CMake] Overriding the include path, library path of OpenSSL, Zlib and libcurl

[Alex Chen]

Although cmake uses the path I supplied for OpenSSL and Zlib, I do not see the 
–I flag being used in compiling the code. (I set VERBOSE=1 to make to see what 
it does.)

When I run ‘ldd’ against the resulting .so files, reference to libssl.so or 
libcrypto.so is empty, i.e ‘libssl.so => not found’, but libz.so still links to 
/lib64/libz.so. (It seems to ignore the fact it does find a new path of zlib.)

 

How to I set the linker flag, i.e. –L and –Wl,-rpath=$myLibPath ?

 

Alex Chen

 

From: CMake  on behalf of Alex Chen 

Date: Friday, April 21, 2017 at 10:28 AM
To: CMake 
Subject: Re: [CMake] Overriding the include path, library path of OpenSSL, Zlib 
and libcurl

 

Thanks for the help.  I will try that. 

 

Alex Chen

 

From: Michael Ellery 
Date: Thursday, April 20, 2017 at 8:13 PM
To: Alex Chen 
Cc: CMake 
Subject: Re: [CMake] Overriding the include path, library path of OpenSSL, Zlib 
and libcurl

 

It doesn’t look like that find module directly supports HINTS or PATHS, so you 
can try setting CMAKE_LIBRARY_PATH and CMAKE_INCLUDE_PATH  
(https://cmake.org/cmake/help/v3.7/variable/CMAKE_LIBRARY_PATH.html) before 
calling the curl finder. I think you can add to those variables whatever paths 
are appropriate to search for CURL on your systems.

 

-Mike

 

On Apr 20, 2017, at 6:06 PM, Alex Chen  wrote:

The source code I want to compile on Linux uses ‘FindOpenSSL’, ‘FindZLIB’, and 
‘FindCURL’ to resolve the paths of these libraries.

However, I have newer version of these libraries in different locations.  How 
to I override these to use my paths?

I am able to use OPENSSL_ROOT_DIR, from FindOpenSSL module, and ZLIB_ROOT, from 
FindZLIB module, to override the paths.  

But I cannot find anything in FindCURL module to override the path of libcurl.

  

  

Alex Chen

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Re: [CMake] Overriding the include path, library path of OpenSSL, Zlib and libcurl

[Alex Chen]

Thanks for the help.  I will try that. 

 

Alex Chen

 

From: Michael Ellery 
Date: Thursday, April 20, 2017 at 8:13 PM
To: Alex Chen 
Cc: CMake 
Subject: Re: [CMake] Overriding the include path, library path of OpenSSL, Zlib 
and libcurl

 

It doesn’t look like that find module directly supports HINTS or PATHS, so you 
can try setting CMAKE_LIBRARY_PATH and CMAKE_INCLUDE_PATH  
(https://cmake.org/cmake/help/v3.7/variable/CMAKE_LIBRARY_PATH.html) before 
calling the curl finder. I think you can add to those variables whatever paths 
are appropriate to search for CURL on your systems.

 

-Mike

 

On Apr 20, 2017, at 6:06 PM, Alex Chen  wrote:

The source code I want to compile on Linux uses ‘FindOpenSSL’, ‘FindZLIB’, and 
‘FindCURL’ to resolve the paths of these libraries.

However, I have newer version of these libraries in different locations.  How 
to I override these to use my paths?

I am able to use OPENSSL_ROOT_DIR, from FindOpenSSL module, and ZLIB_ROOT, from 
FindZLIB module, to override the paths.  

But I cannot find anything in FindCURL module to override the path of libcurl.

  

  

Alex Chen

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Re: [CMake] Overriding the include path, library path of OpenSSL, Zlib and libcurl

[Michael Ellery]

It doesn’t look like that find module directly supports HINTS or PATHS, so you 
can try setting CMAKE_LIBRARY_PATH and CMAKE_INCLUDE_PATH  
(https://cmake.org/cmake/help/v3.7/variable/CMAKE_LIBRARY_PATH.html) before 
calling the curl finder. I think you can add to those variables whatever paths 
are appropriate to search for CURL on your systems.

-Mike

> On Apr 20, 2017, at 6:06 PM, Alex Chen  wrote:
> 
> The source code I want to compile on Linux uses ‘FindOpenSSL’, ‘FindZLIB’, 
> and ‘FindCURL’ to resolve the paths of these libraries.
> However, I have newer version of these libraries in different locations.  How 
> to I override these to use my paths?
> I am able to use OPENSSL_ROOT_DIR, from FindOpenSSL module, and ZLIB_ROOT, 
> from FindZLIB module, to override the paths.  
> But I cannot find anything in FindCURL module to override the path of libcurl.
>  
>  
> Alex Chen
> -- 
> 
> Powered by www.kitware.com
> 
> Please keep messages on-topic and check the CMake FAQ at: 
> http://www.cmake.org/Wiki/CMake_FAQ
> 
> Kitware offers various services to support the CMake community. For more 
> information on each offering, please visit:
> 
> CMake Support: http://cmake.org/cmake/help/support.html
> CMake Consulting: http://cmake.org/cmake/help/consulting.html
> CMake Training Courses: http://cmake.org/cmake/help/training.html
> 
> Visit other Kitware open-source projects at 
> http://www.kitware.com/opensource/opensource.html
> 
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[CMake] Overriding the include path, library path of OpenSSL, Zlib and libcurl

[Alex Chen]

The source code I want to compile on Linux uses ‘FindOpenSSL’, ‘FindZLIB’, and 
‘FindCURL’ to resolve the paths of these libraries.

However, I have newer version of these libraries in different locations.  How 
to I override these to use my paths?

I am able to use OPENSSL_ROOT_DIR, from FindOpenSSL module, and ZLIB_ROOT, from 
FindZLIB module, to override the paths.  

But I cannot find anything in FindCURL module to override the path of libcurl.

 

 

Alex Chen

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