138 lines
7.3 KiB
CMake
138 lines
7.3 KiB
CMake
#
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# Copyright (c) 2008-2021 the Urho3D project.
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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#
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# Workaround try_compile() limitation where it cannot yet see cache variables during initial configuration
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get_property (IN_TRY_COMPILE GLOBAL PROPERTY IN_TRY_COMPILE)
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if (IN_TRY_COMPILE)
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foreach (VAR $ENV{VARS})
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set (${VAR} $ENV{${VAR}})
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endforeach ()
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else ()
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# Prevent critical variables from changing after the initial configuration
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if (CMAKE_CROSSCOMPILING)
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set (SAVED_RPI_SYSROOT ${RPI_SYSROOT} CACHE INTERNAL "Initial value for RPI_SYSROOT")
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set (SAVED_RPI_PREFIX ${RPI_PREFIX} CACHE INTERNAL "Initial value for RPI_PREFIX")
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# Save the initial values of CC and CXX environment variables
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set (SAVED_CC $ENV{CC} CACHE INTERNAL "Initial value for CC")
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set (SAVED_CXX $ENV{CXX} CACHE INTERNAL "Initial value for CXX")
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return ()
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elseif ((SAVED_RPI_SYSROOT AND NOT SAVED_RPI_SYSROOT STREQUAL RPI_SYSROOT) OR (SAVED_RPI_PREFIX AND NOT SAVED_RPI_PREFIX STREQUAL RPI_PREFIX))
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set (RPI_SYSROOT ${SAVED_RPI_SYSROOT} CACHE PATH "Path to Raspberry Pi system root (RPI cross-compiling build only)" FORCE)
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set (RPI_PREFIX ${SAVED_RPI_PREFIX} CACHE STRING "Prefix path to Raspberry Pi cross-compiler tools (RPI cross-compiling build only)" FORCE)
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message (FATAL_ERROR "RPI_SYSROOT and RPI_PREFIX cannot be changed after the initial configuration/generation. "
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"If you wish to change that then the build tree would have to be regenerated from scratch. Auto reverting to its initial value.")
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endif ()
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endif ()
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# Reference toolchain variable to suppress "unused variable" warning
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if (CMAKE_TOOLCHAIN_FILE)
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mark_as_advanced (CMAKE_TOOLCHAIN_FILE)
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endif ()
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# This one is important
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set (CMAKE_SYSTEM_NAME Linux)
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# This one not so much
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set (CMAKE_SYSTEM_PROCESSOR arm)
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set (CMAKE_SYSTEM_VERSION 1)
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# System root
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if (NOT IN_TRY_COMPILE AND NOT SAVED_RPI_SYSROOT)
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if (NOT RPI_SYSROOT AND DEFINED ENV{RPI_SYSROOT})
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file (TO_CMAKE_PATH $ENV{RPI_SYSROOT} RPI_SYSROOT)
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endif ()
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set (RPI_SYSROOT ${RPI_SYSROOT} CACHE PATH "Path to Raspberry Pi system root (RPI cross-compiling build only)")
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if (NOT EXISTS ${RPI_SYSROOT})
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message (FATAL_ERROR "Could not find Raspberry Pi system root. "
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"Use RPI_SYSROOT environment variable or build option to specify the location of system root.")
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endif ()
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endif ()
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set (CMAKE_SYSROOT ${RPI_SYSROOT})
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# Only search libraries and headers in sysroot
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set (CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
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set (CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
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set (CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
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# Cross compiler tools
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if (NOT IN_TRY_COMPILE AND NOT SAVED_RPI_PREFIX)
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if (NOT RPI_PREFIX AND DEFINED ENV{RPI_PREFIX})
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file (TO_CMAKE_PATH $ENV{RPI_PREFIX} RPI_PREFIX)
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endif ()
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set (RPI_PREFIX ${RPI_PREFIX} CACHE STRING "Prefix path to Raspberry Pi cross-compiler tools (RPI cross-compiling build only)")
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if (NOT EXISTS ${RPI_PREFIX}-gcc)
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message (FATAL_ERROR "Could not find Raspberry Pi cross compilation tool. "
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"Use RPI_PREFIX environment variable or build option to specify the location of the toolchain.")
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endif ()
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endif ()
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if (NOT RPI_COMPILER_PREFIX)
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set (RPI_COMPILER_PREFIX ${RPI_PREFIX})
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if ("$ENV{USE_CCACHE}")
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get_filename_component (PATH ${RPI_PREFIX} PATH)
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get_filename_component (NAME ${RPI_PREFIX} NAME)
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execute_process (COMMAND whereis -b ccache COMMAND grep -o \\S*lib\\S* OUTPUT_VARIABLE CCACHE_SYMLINK ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
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if (CCACHE_SYMLINK AND EXISTS ${CCACHE_SYMLINK}/${NAME}-gcc AND EXISTS ${CCACHE_SYMLINK}/${NAME}-g++)
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set (RPI_COMPILER_PREFIX ${CCACHE_SYMLINK}/${NAME})
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else ()
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# Fallback to create the ccache symlink in the build tree itself
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execute_process (COMMAND which ccache RESULT_VARIABLE EXIT_CODE OUTPUT_VARIABLE CCACHE ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
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if (EXIT_CODE EQUAL 0 AND CCACHE)
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foreach (TOOL gcc g++)
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execute_process (COMMAND ${CMAKE_COMMAND} -E create_symlink ${CCACHE} ${CMAKE_BINARY_DIR}/${NAME}-${TOOL})
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endforeach ()
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set (RPI_COMPILER_PREFIX ${CMAKE_BINARY_DIR}/${NAME})
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else ()
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message (WARNING "ccache may not have been installed on this host system. "
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"This is required to enable ccache support for Raspberry-Pi compiler toolchain. "
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"CMake has been configured to use the actual compiler toolchain instead of ccache. "
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"In order to rectify this, the build tree must be regenerated after installing ccache.")
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endif ()
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endif ()
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if (NOT RPI_COMPILER_PREFIX STREQUAL RPI_PREFIX AND NOT $ENV{PATH} MATCHES ${PATH})
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message (FATAL_ERROR "The bin directory containing the compiler toolchain (${PATH}) has not been added in the PATH environment variable. "
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"This is required to enable ccache support for Raspberry-Pi compiler toolchain.")
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endif ()
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endif ()
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set (RPI_COMPILER_PREFIX ${RPI_COMPILER_PREFIX} CACHE INTERNAL "Path to C/C++ compiler tool symlinks or to the actual tools if not using ccache")
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endif ()
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set (CMAKE_C_COMPILER ${RPI_COMPILER_PREFIX}-gcc CACHE PATH "C compiler")
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set (CMAKE_CXX_COMPILER ${RPI_COMPILER_PREFIX}-g++ CACHE PATH "C++ compiler")
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set (CMAKE_STRIP ${RPI_PREFIX}-strip CACHE PATH "strip")
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set (CMAKE_AR ${RPI_PREFIX}-ar CACHE PATH "archive")
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set (CMAKE_LINKER ${RPI_PREFIX}-ld CACHE PATH "linker")
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set (CMAKE_NM ${RPI_PREFIX}-nm CACHE PATH "nm")
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set (CMAKE_OBJCOPY ${RPI_PREFIX}-objcopy CACHE PATH "objcopy")
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set (CMAKE_OBJDUMP ${RPI_PREFIX}-objdump CACHE PATH "objdump")
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set (CMAKE_RANLIB ${RPI_PREFIX}-ranlib CACHE PATH "ranlib")
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# Workaround try_compile() limitation where it cannot yet see cache variables during initial configuration
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if (NOT IN_TRY_COMPILE)
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get_cmake_property (CACHE_VARIABLES CACHE_VARIABLES)
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foreach (VAR ${CACHE_VARIABLES})
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if (VAR MATCHES ^RPI_|CMAKE_CX*_COMPILER)
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set (ENV{${VAR}} ${${VAR}})
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list (APPEND VARS ${VAR})
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endif ()
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endforeach ()
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set (ENV{VARS} "${VARS}") # Stringify to keep the list together
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endif ()
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set (RPI 1)
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