[Bug 1038] New: KDLConfig.cmake.in changes PKG_CONFIG_PATH environment variable and doesn't restore it.

http://bugs.orocos.org/show_bug.cgi?id=1038

           Summary: KDLConfig.cmake.in changes PKG_CONFIG_PATH environment
                    variable and doesn't restore it.
           Product: KDL
           Version: kdl-trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Build system
        AssignedTo: [email protected]
        ReportedBy: [email protected]
                CC: [email protected]
   Estimated Hours: 0.0


This lost me an afternoon's work.

Line 18 in KDLConfig.cmake.in:

set(ENV{PKG_CONFIG_PATH} "@CMAKE_INSTALL_PREFIX@/lib/pkgconfig/")

changes the contents of the environment variable PKG_CONFIG_PATH, which breaks
any other uses of pkg-config later in the cmake session.

The workaround I am currently using looks like this:

set(saved_PKG_CONFIG_PATH $ENV{PKG_CONFIG_PATH})
  find_package(orocos_kdl)
set(ENV{PKG_CONFIG_PATH} ${saved_PKG_CONFIG_PATH})

This does work for me, but should not be necessary.

You could put similar lines in KDLConfig.cmake.in as a first pass, to at least
avoid corrupting the variable for others.  If you do, please use a very unique
temporary variable name, since cmake variables are all in a single namespace.

I'm pretty sure there is a better way though.

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