[yocto] cmake recipe find_file failure

[Matt Broadstone]

On Sat, Apr 9, 2016 at 8:43 AM, Matt Broadstone <mbroadst at gmail.com> wrote:

> Hi,
> I'm trying to build a recipe for apache qpid, which is a cmake-based
> project. Configuration is currently failing due to "find_file" not being
> able to find a file in the source directory for the build:
>
> find_file(QPID_VERSION_FILE NAMES QPID_VERSION.txt PATHS
> ${PROJECT_SOURCE_DIR}/.. ${PROJECT_SOURCE_DIR} NO_DEFAULT_PATH)
> mark_as_advanced(QPID_VERSION_FILE)
> if(NOT QPID_VERSION_FILE)
>   message(FATAL_ERROR "Cannot find QPID_VERSION.txt")
> endif(NOT QPID_VERSION_FILE)
>
> What's truly puzzling is that if I try the following:
>
> execute_process(COMMAND ls ${PROJECT_SOURCE_DIR} OUTPUT_VARIABLE
> TEST_OUTPUT)
> message("LS RESULT: ${TEST_OUTPUT}")
>
> the paths are indeed correct; the result of the ls contains the
> QPID_VERSION.txt file. This seems to indicate to me that something else is
> failing internally, but am not sure where I should be looking exactly.
>
> Has anyone experienced this before? Are there any general tips for
> debugging these types of failures in cmake projects in yocto?
>
> Regards,
> Matt
>

Continuing in the tradition of answering my own silly questions, this seems
to be related to the fact that the cmake.bbclass
overwrites CMAKE_FIND_ROOT_PATH's default value (empty) with yocto-specific
values so as to prevent bleed from the host. Hope this helps someone in the
future.

Matt
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