2 Commits

Author	SHA1	Message	Date
Julien Olivain	b69fc85e66	support/misc/Buildroot-Initialize.cmake: make include optional ... Buildroot commit [1] introduced a new Buildroot-Initialize.cmake file, to mimic the upstream Linux-Initialize.cmake. However, this upstream file was introduced in commit [2], which was introduced in CMake 3.27. When compiling a cmake package on a host with a cmake older than version 3.27 (for example, the Buildroot Docker reference image has cmake 3.25), the configuration fails with the error: CMake Error at /buildroot/output/host/share/buildroot/Platform/Buildroot-Initialize.cmake:1 (include): include could not find requested file: Platform/Linux-Initialize Call Stack (most recent call first): /usr/share/cmake-3.25/Modules/CMakeSystemSpecificInitialize.cmake:21 (include) CMakeLists.txt:20 (project) CMake version < 3.27 is setting its LINUX predefine elsewhere (see commit log of [1]), so this commit fixes the issue by simply making the include optional. This will guarante thee cmake predefines will be present in all the cases. Fixes: [1] [1] ef9f0a07ed [2] cc737ae829 Signed-off-by: Julien Olivain <ju.o@free.fr> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>	2026-02-05 08:14:47 +01:00
Julien Olivain	ef9f0a07ed	package/pkg-cmake.mk: add Platform/Buildroot-Initialize.cmake ... Since commit [1] (core/pkg-cmake: provide our own platform description), Buildroot is setting its own CMake platform description. This description applies minor changes on top of the CMake Linux platform, see [2] and [3]. The CMake system specific script tries to include an initialization script, if present. See [4]. Since in commit [1] we set the CMAKE_SYSTEM_NAME to "Buildroot" (rather than "Linux"), CMake will search for a "Platform/Buildroot-Initialize.cmake" which does not exist, and continue normally, since the include is optional. The "Platform/Linux-Initialize.cmake" file is the one setting the LINUX [6] and UNIX [7] variables, which are expected to be true on a linux compatible system. In Buildroot, it is currently not included, so those variables are unset. If a CMake package in Buildroot has a construct such as: if(LINUX) # ...do things... else() message(FATAL_ERROR "System not supported") endif() It will fail at configuration time. This situation happened when trying to add the btop++ package in Buildroot. See [8]. Since the initial intent of commit [1] was to make the Buildroot CMake system inherit from Linux plus some fixups, this commit simply adds a Buildroot-Initialize.cmake file that includes the Linux-Initialize.cmake one from CMake. This will have the effect to properly define the LINUX and UNIX variables. [1] c69b14fe2f [2] https://gitlab.com/buildroot.org/buildroot/-/blob/2025.11/support/misc/Buildroot.cmake#L1-4 [3] https://cmake.org/cmake/help/v4.2/variable/CMAKE_SYSTEM_NAME.html [4] https://gitlab.kitware.com/cmake/cmake/-/blob/v4.2.1/Modules/CMakeSystemSpecificInitialize.cmake#L35 [5] https://gitlab.kitware.com/cmake/cmake/-/blob/v4.2.1/Modules/Platform/Linux-Initialize.cmake [6] https://cmake.org/cmake/help/v4.2/variable/LINUX.html [7] https://cmake.org/cmake/help/v4.2/variable/UNIX.html [8] https://github.com/aristocratos/btop/blob/v1.4.6/CMakeLists.txt#L76 Reported-by: Gilles Talis <gilles.talis@gmail.com> Signed-off-by: Julien Olivain <ju.o@free.fr> Tested-by: Gilles Talis <gilles.talis@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>	2026-02-04 10:12:44 +01:00