[yocto] Basic Yocto+CMake Usage question

[A]

Thank you for the quick suggestion.

Unfortunately, I tried setting OECMAKE_FIND_ROOT_PATH_MODE_LIBRARY to
"ONLY", "NEVER", and "BOTH" separately, and none of the above worked.  I
must be doing something fundamentally wrong.

Any other suggestions?


On Thu, Mar 28, 2019 at 12:30 PM Patrick Boettcher <
patrick.boettcher at posteo.de> wrote:

> Hi
>
> On Thu, 28 Mar 2019 12:20:43 -0400
> A <aaron.biver at gmail.com> wrote:
>
> > I'm having issues with a yocto build that is combining recipes that
> > should depend on each other, and I need a sanity check.  Is this an
> > ok forum for stupid user questions?
> >
> > The main idea is to have one recipe install some prebuilt libraries,
> > and have another cmake-based recipe use those libraries.
> >
> > As a caveat, this is a native version of the build that I seem to be
> > having trouble with, but I assume that is mostly irrelevant:
> >
> > In ProjectA, the meat of the matter is a do_install that copies
> > ProjectA*.so into STAGING_LIBDIR.  I don't recall why I chose that
> > instead of ${D}${libdir}... is it ok this way?
> > In ProjectB, I'd like CMake's find_library() to find Project A's
> > libraries, and I seem to be having trouble.
> >
> > How would you approach this?  The recipe for Project B contains
> > "inherit cmake" and some variables I pass in with an EXTRA_OECMAKE
> > and an EXTRA_OECMAKE-native.
> >
> > I also have there:
> > DEPENDS += "ProjectA"
> > DEPENDS_class-native = "ProjectA-native"
> >
> > However,in ProjectB's find_library() call, I am uncertain how to
> > direct it to find those libraries - what PATHS or HINTS or whatever?
>
> I was having similar problems with this (a dependency for zeromq in my
> case).
>
>   DEPENDS = "zeromq" # build dependency
>
> I had to add the following variable to my recipes:
>
>   OECMAKE_FIND_ROOT_PATH_MODE_PROGRAM = "BOTH"
>
> this, iiuc, tells cmake that in case of cross-compiling (via a
> toolchain-file) that it shall also look in the sysroot for header
> and library-files when doing find_library(). Not sure if it will work
> with all find_package()-modules.
>
> It worked, I haven't investigated further why, but I should have.
>
> HTH.
> --
> Patrick.
>
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