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cmake improve cross documentation

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Signed-off-by: Andy Green <andy.green@linaro.org>
This commit is contained in:
Andy Green 2013-03-30 10:30:03 +08:00
parent 9a4fef7ed6
commit 5b479ac2f1
3 changed files with 40 additions and 25 deletions
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2
CMakeLists.txt
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@ -17,6 +17,8 @@ set(VERSION "${CPACK_PACKAGE_VERSION}")
set(LWS_LIBRARY_VERSION ${CPACK_PACKAGE_VERSION})
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}/cmake/")
message(STATUS "CMAKE_TOOLCHAIN_FILE='${CMAKE_TOOLCHAIN_FILE}'")
# Try to find the current Git hash.
find_package(Git)
if(GIT_EXECUTABLE)

35
README.build
View file

@ -146,35 +146,20 @@ a "Toolchain file" that you supply to CMake when generating your build files.
CMake will then use the cross compilers and build paths specified in this file
to look for dependencies and such.
Below is an example of how one of these files might look like:
Libwebsockets includes an example toolchain file cross-arm-linux-gnueabihf.cmake
you can use as a starting point.
#
# CMake Toolchain file for crosscompiling on ARM.
#
# This can be used when running cmake in the following way:
# cd build/
# cmake .. -DCMAKE_TOOLCHAIN_FILE=/path/to/this/file/TC_arm-linux-gcc.cmake
#
The commandline to configure for cross with this would look like
set(CROSS_PATH /path/to/cross_environment/uClibc)
cmake .. -DCMAKE_INSTALL_PREFIX:PATH=/usr \
-DCMAKE_TOOLCHAIN_FILE=../cross-arm-linux-gnueabihf.cmake \
-DWITHOUT_EXTENSIONS=1 -DWITH_SSL=0
# Target operating system name.
set(CMAKE_SYSTEM_NAME Linux)
The example shows how to build with no external cross lib dependencies, you
need to proide the cross libraries otherwise.
# Name of C compiler.
set(CMAKE_C_COMPILER "${CROSS_PATH}/bin/arm-linux-uclibc-gcc")
set(CMAKE_CXX_COMPILER "${CROSS_PATH}/bin/arm-linux-uclibc-g++")
# Where to look for the target environment. (More paths can be added here)
set(CMAKE_FIND_ROOT_PATH "${CROSS_PATH}")
# Adjust the default behavior of the FIND_XXX() commands:
# search programs in the host environment only.
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
# Search headers and libraries in the target environment only.
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
NOTE: start from an EMPTY build directory if you had a non-cross build in there
before the settings will be cached and your changes ignored.
Additional information on cross compilation with CMake:
http://www.vtk.org/Wiki/CMake_Cross_Compiling

28
cross-arm-linux-gnueabihf.cmake Normal file
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@ -0,0 +1,28 @@
#
# CMake Toolchain file for crosscompiling on ARM.
#
# This can be used when running cmake in the following way:
# cd build/
# cmake .. -DCMAKE_TOOLCHAIN_FILE=../cross-arm-linux-gnueabihf.cmake
#
set(CROSS_PATH /opt/gcc-linaro-arm-linux-gnueabihf-4.7-2013.02-01-20130221_linux)
# Target operating system name.
set(CMAKE_SYSTEM_NAME Linux)
# Name of C compiler.
set(CMAKE_C_COMPILER "${CROSS_PATH}/bin/arm-linux-gnueabihf-gcc")
set(CMAKE_CXX_COMPILER "${CROSS_PATH}/bin/arm-linux-gnueabihf-g++")
# Where to look for the target environment. (More paths can be added here)
set(CMAKE_FIND_ROOT_PATH "${CROSS_PATH}")
# Adjust the default behavior of the FIND_XXX() commands:
# search programs in the host environment only.
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
# Search headers and libraries in the target environment only.
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)