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cmake: Document CMAKE_SYSTEM_-variables, and add CMAKE_SYSTEM_VERSION

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Aid user in understanding what CMake expects of:

 * Document and add CMAKE_SYSTEM_VERSION
 * Document CMAKE_SYSTEM_NAME
 * Document CMAKE_SYSTEM_PROCESSOR
 * Document BUILD_SHARED_LIBS
 * Document Policies CMP0002, CMP0079

CMAKE_SYSTEM_VERSION is required officially by CMake, but appears
unused -- at least now we are compliant.

Signed-off-by: Mark Ruvald Pedersen <mped@oticon.com>
This commit is contained in:
Mark Ruvald Pedersen 2018-12-19 16:01:05 +01:00 • committed by Carles Cufí
commit 6e158b1794
2 changed files with 30 additions and 1 deletions
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2
cmake/app/boilerplate.cmake
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@ -21,11 +21,13 @@
# invocation in every toplevel CMakeLists.txt.
cmake_minimum_required(VERSION 3.8.2)
# CMP0002: "Logical target names must be globally unique"
cmake_policy(SET CMP0002 NEW)
if(NOT (${CMAKE_VERSION} VERSION_LESS "3.13.0"))
# Use the old CMake behaviour until 3.13.x is required and the build
# scripts have been ported to the new behaviour.
# CMP0079: "target_link_libraries() allows use with targets in other directories"
cmake_policy(SET CMP0079 OLD)
endif()

29
cmake/target_toolchain.cmake
View file

@ -1,6 +1,33 @@
set(CMAKE_SYSTEM_NAME Generic)
# No official documentation exists for the "Generic" value, except their wiki.
#
# https://gitlab.kitware.com/cmake/community/wikis/doc/cmake/CrossCompiling:
# CMAKE_SYSTEM_NAME : this one is mandatory, it is the name of the target
# system, i.e. the same as CMAKE_SYSTEM_NAME would have if CMake would run
# on the target system. Typical examples are "Linux" and "Windows". This
# variable is used for constructing the file names of the platform files
# like Linux.cmake or Windows-gcc.cmake. If your target is an embedded
# system without OS set CMAKE_SYSTEM_NAME to "Generic".
set(CMAKE_SYSTEM_NAME Generic)
# https://cmake.org/cmake/help/latest/variable/CMAKE_SYSTEM_PROCESSOR.html:
# The name of the CPU CMake is building for.
#
# https://gitlab.kitware.com/cmake/community/wikis/doc/cmake/CrossCompiling:
# CMAKE_SYSTEM_PROCESSOR : optional, processor (or hardware) of the
# target system. This variable is not used very much except for one
# purpose, it is used to load a
# CMAKE_SYSTEM_NAME-compiler-CMAKE_SYSTEM_PROCESSOR.cmake file,
# which can be used to modify settings like compiler flags etc. for
# the target
set(CMAKE_SYSTEM_PROCESSOR ${ARCH})
# https://cmake.org/cmake/help/latest/variable/CMAKE_SYSTEM_VERSION.html:
# 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.
set(CMAKE_SYSTEM_VERSION ${PROJECT_VERSION})
# We are not building dynamically loadable libraries
set(BUILD_SHARED_LIBS OFF)
if(NOT (COMPILER STREQUAL "host-gcc"))