[Bug 201057] [PATCH] devel/jsoncpp: Properly version libjsoncpp.so.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201057

            Bug ID: 201057
           Summary: [PATCH] devel/jsoncpp: Properly version libjsoncpp.so.
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: rakuco at FreeBSD.org
                CC: johan at stromnet.se
             Flags: maintainer-feedback?(johan at stromnet.se)

The attached patch fixes the problem described in bug 200969: currently,
libjsoncpp.so is not properly versioned by SCons; in other words, there's no
SONAME in the library's ELF header, which confuses the linker when creating
binaries that link against it. This causes the problems in the bug I mentioned
before.

Solve it by using InstallVersionedLib(), available since SCons 2.3.0: this call
is able to properly version the shared library the way we need it. Since there
is no support for actually installing the files outside the build directory, we
have to recreate the required symlinks ourselves in the Makefile. Another
related change is that we now create the libraries with the proper names
instead of doing that in the Makefile.

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