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package/pkg-cmake: add CMAKE_SYSTEM_VERSION to toolchainfile.cmake

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Quoting the CMake documentation:

  When the CMAKE_SYSTEM_NAME variable is set explicitly to enable cross
  compiling then the value of CMAKE_SYSTEM_VERSION must also be set
  explicitly to specify the target system version.

Thus, we should also set CMAKE_SYSTEM_VERSION in toolchainfile.cmake. It
is supposed to be set to the value of `uname -r` on the target. We don't
have that exact value available (unless we build the kernel), but the
value of BR2_TOOLCHAIN_HEADERS_AT_LEAST contains the (minimum) version
of the kernel it will run on, so it should be OK for all practical
purposes.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 36568732e4)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Arnout Vandecappelle (Essensium/Mind)
2019-01-11 00:05:28 +01:00
committed by Peter Korsgaard
parent 897ac7f65e
commit f82541bb8b
2 changed files with 2 additions and 0 deletions
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1
support/misc/toolchainfile.cmake.in
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@@ -15,6 +15,7 @@ string(REPLACE "/share/buildroot" "" RELOCATED_HOST_DIR ${CMAKE_CURRENT_LIST_DIR
list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR})
set(CMAKE_SYSTEM_NAME Buildroot)
set(CMAKE_SYSTEM_VERSION @@CMAKE_SYSTEM_VERSION@@)
set(CMAKE_SYSTEM_PROCESSOR @@CMAKE_SYSTEM_PROCESSOR@@)
# Set the {C,CXX}FLAGS appended by CMake depending on the build type