[cmake-developers] [CMake] Debugging find_package() search behavior?

Robert Dailey rcdailey.lists at gmail.com
Tue Aug 29 11:11:36 EDT 2017


What I'm hoping for is that find_package() follows the rules it
documents here:
https://cmake.org/cmake/help/v3.6/command/find_package.html

Specifically, it states it searches these paths (and that <name> is
treated case-insensitive):

<prefix>/                                               (W)
<prefix>/(cmake|CMake)/                                 (W)
<prefix>/<name>*/                                       (W)
<prefix>/<name>*/(cmake|CMake)/                         (W)
<prefix>/(lib/<arch>|lib|share)/cmake/<name>*/          (U)
<prefix>/(lib/<arch>|lib|share)/<name>*/                (U)
<prefix>/(lib/<arch>|lib|share)/<name>*/(cmake|CMake)/  (U)

If this is true, then the 3rd one from the top should be a match,
because <prefix> is set to:

E:/code/frontend/msvc_2015/third_party/installed

And <name> is set to ZLIB in find_package() first argument, so it
should be adding that to the end.

I need to keep CMAKE_PREFIX_PATH pointing to the parent directory
("installed") because I have other libraries that get installed in
that directory, each with their own directory to contain their
installation files. If find_package() is appending <name> to <prefix>
like it says it should, it should find each one of them without
switching the value of CMAKE_PREFIX_PATH.

Am I misunderstanding something?


On Tue, Aug 29, 2017 at 10:06 AM, David Cole <DLRdave at aol.com> wrote:
> Shouldn't the "/zlib" at the end be included in your CMAKE_PREFIX_PATH?
>
> On Tue, Aug 29, 2017 at 11:01 AM, Robert Dailey
> <rcdailey.lists at gmail.com> wrote:
>> On Tue, Aug 29, 2017 at 9:56 AM, Brad King <brad.king at kitware.com> wrote:
>>> On 08/29/2017 10:55 AM, Brad King wrote:
>>>> On 08/29/2017 10:48 AM, Robert Dailey wrote:
>>>>> CMAKE_PREFIX_PATH: E:/code/frontend/msvc_2015/third_party/installed
>>>>> CMAKE_FIND_ROOT_PATH: E:/code/frontend/msvc_2015/third_party/installed
>>>>
>>>> I'm not sure how CMAKE_FIND_ROOT_PATH's path re-rooting interacts with
>>>> drive letters on Windows.
>>>
>>> Oops, sent too soon.
>>>
>>> CMAKE_FIND_ROOT_PATH should not be necessary here.  It's for cross-compiling
>>> to re-root paths like `/usr` into some prefix on the host.
>>>
>>> -Brad
>>
>> Ok but even if I remove that, find_package() still isn't working......
>> --
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