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https://issues.apache.org/jira/browse/PROTON-1381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15804312#comment-15804312
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Volker Diels-Grabsch commented on PROTON-1381:
----------------------------------------------

I verified that this patch works with the following OpenSSL versions:

* 1.1.0c
* 1.0.2j
* 1.0.1u

Note that OpenSSL 1.0.1 and older should not be used anymore, for security 
reasons, because these are longer supported by the OpenSSL team.

Also note that this patch fixes *all* issues of qpid-proton 0.14.0, but only 
*some* of 0.16.0. That is, 0.16.0 introduced some more compilation issues on 
top of the issues of 0.14.0. This patch applies to 0.14.0 as well as 0.16.0, 
and fixes all compiling issues of 0.16.0 that were also present in 0.14.0.

> Compiler errors: dereferencing pointer to incomplete type DH {aka struct 
> dh_st}
> -------------------------------------------------------------------------------
>
>                 Key: PROTON-1381
>                 URL: https://issues.apache.org/jira/browse/PROTON-1381
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: proton-c
>    Affects Versions: 0.14.0, 0.16.0
>         Environment: GCC 6.2.1, OpenSSL 1.1.0c
>            Reporter: Volker Diels-Grabsch
>            Assignee: Andrew Stitcher
>            Priority: Blocker
>              Labels: build, patch
>         Attachments: 
> qpid-proton-0.14.0-fix-dereferencing-pointer-to-incomplete-type.patch
>
>
> Proton-C doesn't build with GCC 6.2.1 and OpenSSL 1.1.0c. The error message 
> is:
> {code:borderStyle=solid}
> [ 51%] Building C object 
> proton-c/CMakeFiles/qpid-proton.dir/src/ssl/openssl.c.o
> /.../proton-c/src/ssl/openssl.c: In function ‘get_dh2048’:
> /.../proton-c/src/ssl/openssl.c:406:5: error: dereferencing pointer to 
> incomplete type ‘DH {aka struct dh_st}’
>    dh->p=BN_bin2bn(dh2048_p,sizeof(dh2048_p),NULL);
>      ^~
> proton-c/CMakeFiles/qpid-proton.dir/build.make:1102: recipe for target 
> 'proton-c/CMakeFiles/qpid-proton.dir/src/ssl/openssl.c.o' failed
> {code}
> The attached patch fixes this issue for 0.14.0 and also works for 0.16.0.



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