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package/pkg-cmake.mk: add Platform/Buildroot-Initialize.cmake

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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>
This commit is contained in:
Julien Olivain
2026-01-17 11:31:09 +01:00
committed by Thomas Petazzoni
parent 22ec30b514
commit ef9f0a07ed
2 changed files with 3 additions and 0 deletions
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2
package/pkg-cmake.mk
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@@ -287,6 +287,8 @@ define TOOLCHAIN_CMAKE_INSTALL_FILES
> $(HOST_DIR)/share/buildroot/toolchainfile.cmake
$(Q)$(INSTALL) -D -m 0644 support/misc/Buildroot.cmake \
$(HOST_DIR)/share/buildroot/Platform/Buildroot.cmake
$(Q)$(INSTALL) -D -m 0644 support/misc/Buildroot-Initialize.cmake \
$(HOST_DIR)/share/buildroot/Platform/Buildroot-Initialize.cmake
endef
TOOLCHAIN_POST_INSTALL_STAGING_HOOKS += TOOLCHAIN_CMAKE_INSTALL_FILES

1
support/misc/Buildroot-Initialize.cmake Normal file
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@@ -0,0 +1 @@
include(Platform/Linux-Initialize)