894ad2b094
Currently, we tell cmake where to look for our own custom platform
description by passing the path to the moduls directory on the command
line.
However, this causes two different problems.
First, some packages simply set CMAKE_MODULE_PATH in their
CMakeList.txt, thus overriding our own path, and then our platform
description is not found.
Second, cmake may internally call sub-cmake (e.g. in the try_compile
macro), but the CMAKE_MODULE_PATH is not automatically passed down in
this case.
For the first problem, we could hunt down and fix all offenders, but
this is an endless endeavour, especially since packagers are told to do
so on the cmake wiki [0]:
CMAKE_MODULE_PATH
tell CMake to search first in directories listed in
CMAKE_MODULE_PATH when you use FIND_PACKAGE() or INCLUDE()
SET(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/MyCMakeScripts)
FIND_PACKAGE(HelloWorld)
The second problem could be solved by passing yet another variable on
the command line, that tells cmake to explicitly pass arbitrary
variables down to sub-cmake calls:
-DCMAKE_TRY_COMPILE_PLATFORM_VARIABLES=CMAKE_MODULE_PATH
However, this only covers the case of try_compile. Even though no other
case is known yet, we'd still risk missing locations where we would need
to propagate CMAKE_MODULE_PATH, even some where we'd have no solution
like for try_compile.
Instead, ngladitz on IRC suggested that CMAKE_MODULE_PATH be set
directly from the toolchain file.
And indeed this fixes both problems explained above.
So be it.
[0] https://cmake.org/Wiki/CMake_Useful_Variables
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Samuel Martin <s.martin49@gmail.com>
Cc: Jörg Krause <joerg.krause@embedded.rocks>
Cc: Ben Boeckel <mathstuf@gmail.com>
Cc: Baruch Siach <baruch@tkos.co.il>
Cc: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches