Stephen Kelly wrote:
> Sounds good to me. I haven't looked into the implementation details like
> that yet, but I'll do so tomorrow.
I looked into the implementation details and used the following two
toolchains to test it:
rpitoolchain.cmake:
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSROOT /home/stephen/rpi/rasp-pi-rootfs)
set(CMAKE_STAGING_PREFIX /home/stephen/dev/src/qtbase-rpi/extprefix)
set(CMAKE_C_COMPILER /home/stephen/rpi/gcc-4.7-linaro-rpi-
gnueabihf/bin/arm-linux-gnueabihf-gcc)
set(CMAKE_CXX_COMPILER /home/stephen/rpi/gcc-4.7-linaro-rpi-
gnueabihf/bin/arm-linux-gnueabihf-g++)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
clangtargettoolchain.cmake:
set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSROOT /home/stephen/rpi/rasp-pi-rootfs)
set(CMAKE_STAGING_PREFIX /home/stephen/dev/src/qtbase-rpi/extprefix)
set(triple arm-linux-gnueabihf)
set(gcc_toolchain /home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf)
set(CMAKE_C_COMPILER /home/stephen/dev/build/qtbase/llvm/bin/clang)
set(CMAKE_C_COMPILER_TARGET ${triple})
set(CMAKE_C_COMPILER_EXTERNAL_TOOLCHAIN ${gcc_toolchain})
set(CMAKE_CXX_COMPILER /home/stephen/dev/build/qtbase/llvm/bin/clang++)
set(CMAKE_CXX_COMPILER_TARGET ${triple})
set(CMAKE_CXX_COMPILER_EXTERNAL_TOOLCHAIN ${gcc_toolchain})
# Debian bug 708744
include_directories(SYSTEM "${CMAKE_SYSROOT}/usr/include/${triple}")
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
I tested with this CMakeLists.txt:
cmake_minimum_required(VERSION 2.8.12)
find_package(Qt5Widgets 5.2 REQUIRED)
find_package(ZLIB REQUIRED)
include_directories(${ZLIB_INCLUDE_DIRS})
add_executable(main main.cpp)
target_link_libraries(main ${ZLIB_LIBRARIES} Qt5::Widgets)
stephen@hal:~/dev/src/playground/cmake/build{master}$ cmake .. -
DCMAKE_TOOLCHAIN_FILE=../rpitoolchain.cmake -DCMAKE_INSTALL_PREFIX=/opt/kf5
-- The C compiler identification is GNU 4.7.2
-- The CXX compiler identification is GNU 4.7.2
-- Check for working C compiler: /home/stephen/rpi/gcc-4.7-linaro-rpi-
gnueabihf/bin/arm-linux-gnueabihf-gcc
-- Check for working C compiler: /home/stephen/rpi/gcc-4.7-linaro-rpi-
gnueabihf/bin/arm-linux-gnueabihf-gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /home/stephen/rpi/gcc-4.7-linaro-rpi-
gnueabihf/bin/arm-linux-gnueabihf-g++
-- Check for working CXX compiler: /home/stephen/rpi/gcc-4.7-linaro-rpi-
gnueabihf/bin/arm-linux-gnueabihf-g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Found ZLIB: /home/stephen/rpi/rasp-pi-rootfs/usr/lib/arm-linux-
gnueabihf/libz.so (found version "1.2.7")
-- Configuring done
-- Generating done
-- Build files have been written to:
/home/stephen/dev/src/playground/cmake/build
Qt( base ) KDE ( )
stephen@hal:~/dev/src/playground/cmake/build{master}$ make VERBOSE=1
makeobj[0]: Entering directory
`/home/stephen/dev/src/playground/cmake/build'
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -
H/home/stephen/dev/src/playground/cmake -
B/home/stephen/dev/src/playground/cmake/build --check-build-system
CMakeFiles/Makefile.cmake 0
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -E cmake_progress_start
/home/stephen/dev/src/playground/cmake/build/CMakeFiles
/home/stephen/dev/src/playground/cmake/build/CMakeFiles/progress.marks
/usr/bin/make -f CMakeFiles/Makefile2 all
make[1]: Entering directory `/home/stephen/safe/dev/playground/cmake/build'
/usr/bin/make -f CMakeFiles/main.dir/build.make CMakeFiles/main.dir/depend
make[2]: Entering directory `/home/stephen/safe/dev/playground/cmake/build'
cd /home/stephen/dev/src/playground/cmake/build &&
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -E cmake_depends "Unix
Makefiles" /home/stephen/dev/src/playground/cmake
/home/stephen/dev/src/playground/cmake
/home/stephen/dev/src/playground/cmake/build
/home/stephen/dev/src/playground/cmake/build
/home/stephen/dev/src/playground/cmake/build/CMakeFiles/main.dir/DependInfo.cmake
--color=
Dependee
"/home/stephen/dev/src/playground/cmake/build/CMakeFiles/main.dir/DependInfo.cmake"
is newer than depender
"/home/stephen/dev/src/playground/cmake/build/CMakeFiles/main.dir/depend.internal".
Dependee
"/home/stephen/dev/src/playground/cmake/build/CMakeFiles/CMakeDirectoryInformation.cmake"
is newer than depender
"/home/stephen/dev/src/playground/cmake/build/CMakeFiles/main.dir/depend.internal".
Scanning dependencies of target main
make[2]: Leaving directory `/home/stephen/safe/dev/playground/cmake/build'
/usr/bin/make -f CMakeFiles/main.dir/build.make CMakeFiles/main.dir/build
make[2]: Entering directory `/home/stephen/safe/dev/playground/cmake/build'
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -E cmake_progress_report
/home/stephen/dev/src/playground/cmake/build/CMakeFiles 1
[100%] Building CXX object CMakeFiles/main.dir/main.cpp.o
/home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf-g++
--sysroot=/home/stephen/rpi/rasp-pi-rootfs -DQT_CORE_LIB -DQT_GUI_LIB -
DQT_NO_DEBUG -DQT_WIDGETS_LIB -fPIE -isystem /home/stephen/dev/src/qtbase-
rpi/extprefix/include -isystem /home/stephen/dev/src/qtbase-
rpi/extprefix/include/QtWidgets -isystem /home/stephen/dev/src/qtbase-
rpi/extprefix/include/QtGui -isystem /home/stephen/rpi/rasp-pi-
rootfs/opt/vc/include -isystem /home/stephen/dev/src/qtbase-
rpi/extprefix/include/QtCore -isystem /home/stephen/dev/src/qtbase-
rpi/hostprefix/mkspecs/devices/linux-rasp-pi-g++ -o
CMakeFiles/main.dir/main.cpp.o -c
/home/stephen/dev/src/playground/cmake/main.cpp
Linking CXX executable main
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -E cmake_link_script
CMakeFiles/main.dir/link.txt --verbose=1
/home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf-g++
--sysroot=/home/stephen/rpi/rasp-pi-rootfs
CMakeFiles/main.dir/main.cpp.o -o main -rdynamic -lz
/home/stephen/dev/src/qtbase-rpi/extprefix/lib/libQt5Widgets.so.5.3.0
/home/stephen/dev/src/qtbase-rpi/extprefix/lib/libQt5Gui.so.5.3.0
/home/stephen/dev/src/qtbase-rpi/extprefix/lib/libQt5Core.so.5.3.0 -Wl,-
rpath,/opt/kf5/lib:/opt/vc/lib -Wl,-rpath-link,/home/stephen/rpi/rasp-pi-
rootfs/opt/vc/lib
make[2]: Leaving directory `/home/stephen/safe/dev/playground/cmake/build'
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -E cmake_progress_report
/home/stephen/dev/src/playground/cmake/build/CMakeFiles 1
[100%] Built target main
make[1]: Leaving directory `/home/stephen/safe/dev/playground/cmake/build'
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -E cmake_progress_start
/home/stephen/dev/src/playground/cmake/build/CMakeFiles 0
makeobj[0]: Leaving directory `/home/stephen/dev/src/playground/cmake/build'
So, determining compiler information works, find_package works, the zlib
include dir is stripped as it is implicit (and I verified that the sysroot
zlib.h is used by adding an #error), the libz.so.1.2.7 is simplified to -lz
because of the implicit link directories, the -rpath info is properly
transformed with the CMAKE_INSTALL_PREFIX replacing the
CMAKE_STAGING_PREFIX, and the -rpath-link info is properly not transformed.
I also tested without setting the CMAKE_INSTALL_PREFIX and the default
/usr/local path is the result of the transformation.
The clang toolchain also works fine with clang trunk (I made some changes
there to find the crti.o etc properly).
stephen@hal:~/dev/src/playground/cmake/build{master}$ cmake .. -
DCMAKE_TOOLCHAIN_FILE=../clangtargettoolchain.cmake
-- The C compiler identification is Clang 3.4.0
-- The CXX compiler identification is Clang 3.4.0
-- Check for working C compiler:
/home/stephen/dev/build/qtbase/llvm/bin/clang
-- Check for working C compiler:
/home/stephen/dev/build/qtbase/llvm/bin/clang -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler:
/home/stephen/dev/build/qtbase/llvm/bin/clang++
-- Check for working CXX compiler:
/home/stephen/dev/build/qtbase/llvm/bin/clang++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Found ZLIB: /home/stephen/rpi/rasp-pi-rootfs/usr/lib/arm-linux-
gnueabihf/libz.so (found version "1.2.7")
-- Configuring done
-- Generating done
-- Build files have been written to:
/home/stephen/dev/src/playground/cmake/build
Qt( base ) KDE ( )
stephen@hal:~/dev/src/playground/cmake/build{master}$ make VERBOSE=1
makeobj[0]: Entering directory
`/home/stephen/dev/src/playground/cmake/build'
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -
H/home/stephen/dev/src/playground/cmake -
B/home/stephen/dev/src/playground/cmake/build --check-build-system
CMakeFiles/Makefile.cmake 0
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -E cmake_progress_start
/home/stephen/dev/src/playground/cmake/build/CMakeFiles
/home/stephen/dev/src/playground/cmake/build/CMakeFiles/progress.marks
/usr/bin/make -f CMakeFiles/Makefile2 all
make[1]: Entering directory `/home/stephen/safe/dev/playground/cmake/build'
/usr/bin/make -f CMakeFiles/main.dir/build.make CMakeFiles/main.dir/depend
make[2]: Entering directory `/home/stephen/safe/dev/playground/cmake/build'
cd /home/stephen/dev/src/playground/cmake/build &&
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -E cmake_depends "Unix
Makefiles" /home/stephen/dev/src/playground/cmake
/home/stephen/dev/src/playground/cmake
/home/stephen/dev/src/playground/cmake/build
/home/stephen/dev/src/playground/cmake/build
/home/stephen/dev/src/playground/cmake/build/CMakeFiles/main.dir/DependInfo.cmake
--color=
Dependee
"/home/stephen/dev/src/playground/cmake/build/CMakeFiles/main.dir/DependInfo.cmake"
is newer than depender
"/home/stephen/dev/src/playground/cmake/build/CMakeFiles/main.dir/depend.internal".
Dependee
"/home/stephen/dev/src/playground/cmake/build/CMakeFiles/CMakeDirectoryInformation.cmake"
is newer than depender
"/home/stephen/dev/src/playground/cmake/build/CMakeFiles/main.dir/depend.internal".
Scanning dependencies of target main
make[2]: Leaving directory `/home/stephen/safe/dev/playground/cmake/build'
/usr/bin/make -f CMakeFiles/main.dir/build.make CMakeFiles/main.dir/build
make[2]: Entering directory `/home/stephen/safe/dev/playground/cmake/build'
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -E cmake_progress_report
/home/stephen/dev/src/playground/cmake/build/CMakeFiles 1
[100%] Building CXX object CMakeFiles/main.dir/main.cpp.o
/home/stephen/dev/build/qtbase/llvm/bin/clang++ -target arm-linux-gnueabihf
-gcc-toolchain /home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf --
sysroot=/home/stephen/rpi/rasp-pi-rootfs -DQT_CORE_LIB -DQT_GUI_LIB -
DQT_NO_DEBUG -DQT_WIDGETS_LIB -fPIE -isystem /home/stephen/rpi/rasp-pi-
rootfs/usr/include/arm-linux-gnueabihf -isystem
/home/stephen/dev/src/qtbase-rpi/extprefix/include -isystem
/home/stephen/dev/src/qtbase-rpi/extprefix/include/QtWidgets -isystem
/home/stephen/dev/src/qtbase-rpi/extprefix/include/QtGui -isystem
/home/stephen/rpi/rasp-pi-rootfs/opt/vc/include -isystem
/home/stephen/dev/src/qtbase-rpi/extprefix/include/QtCore -isystem
/home/stephen/dev/src/qtbase-rpi/hostprefix/mkspecs/devices/linux-rasp-pi-
g++ -o CMakeFiles/main.dir/main.cpp.o -c
/home/stephen/dev/src/playground/cmake/main.cpp
Linking CXX executable main
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -E cmake_link_script
CMakeFiles/main.dir/link.txt --verbose=1
/home/stephen/dev/build/qtbase/llvm/bin/clang++ -target arm-linux-gnueabihf
-gcc-toolchain /home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf --
sysroot=/home/stephen/rpi/rasp-pi-rootfs CMakeFiles/main.dir/main.cpp.o
-o main -rdynamic -lz /home/stephen/dev/src/qtbase-
rpi/extprefix/lib/libQt5Widgets.so.5.3.0 /home/stephen/dev/src/qtbase-
rpi/extprefix/lib/libQt5Gui.so.5.3.0 /home/stephen/dev/src/qtbase-
rpi/extprefix/lib/libQt5Core.so.5.3.0 -Wl,-rpath,/usr/local/lib:/opt/vc/lib
-Wl,-rpath-link,/home/stephen/rpi/rasp-pi-rootfs/opt/vc/lib
make[2]: Leaving directory `/home/stephen/safe/dev/playground/cmake/build'
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -E cmake_progress_report
/home/stephen/dev/src/playground/cmake/build/CMakeFiles 1
[100%] Built target main
make[1]: Leaving directory `/home/stephen/safe/dev/playground/cmake/build'
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -E cmake_progress_start
/home/stephen/dev/src/playground/cmake/build/CMakeFiles 0
makeobj[0]: Leaving directory `/home/stephen/dev/src/playground/cmake/build'
All the same things work as with the other toolchain, and now the -target
and -gcc-toolchain are also properly passed, which result in finding
binutils etc properly.
I also tested a static and shared lib.
Linking CXX shared library libuser2.so
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -E cmake_link_script
CMakeFiles/user2.dir/link.txt --verbose=1
/home/stephen/dev/build/qtbase/llvm/bin/clang++ -target arm-linux-gnueabihf
-gcc-toolchain /home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf --
sysroot=/home/stephen/rpi/rasp-pi-rootfs -fPIC -shared -Wl,-
soname,libuser2.so -o libuser2.so CMakeFiles/user2.dir/lib.cpp.o
/home/stephen/dev/src/qtbase-rpi/extprefix/lib/libQt5Widgets.so.5.3.0
/home/stephen/dev/src/qtbase-rpi/extprefix/lib/libQt5Gui.so.5.3.0
/home/stephen/dev/src/qtbase-rpi/extprefix/lib/libQt5Core.so.5.3.0 -Wl,-
rpath,/opt/kf5/lib:/opt/vc/lib -Wl,-rpath-link,/home/stephen/rpi/rasp-pi-
rootfs/opt/vc/lib
Linking CXX static library libuser.a
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -P
CMakeFiles/user.dir/cmake_clean_target.cmake
/home/stephen/dev/prefix/qtbase/kde/bin/cmake -E cmake_link_script
CMakeFiles/user.dir/link.txt --verbose=1
/home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf-ar cr
libuser.a CMakeFiles/user.dir/lib.cpp.o
/home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf-
ranlib libuser.a
So, the correct ar and ranlib are used when building the static library.
When building the shared library, the correct ld is used:
stephen@hal:~/dev/src/playground/cmake/build{master}$
/home/stephen/dev/build/qtbase/llvm/bin/clang++ -target arm-linux-gnueabihf
-gcc-toolchain /home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf --
sysroot=/home/stephen/rpi/rasp-pi-rootfs -fPIC -shared -Wl,-
soname,libuser2.so -o libuser2.so CMakeFiles/user2.dir/lib.cpp.o
/home/stephen/dev/src/qtbase-rpi/extprefix/lib/libQt5Widgets.so.5.3.0
/home/stephen/dev/src/qtbase-rpi/extprefix/lib/libQt5Gui.so.5.3.0
/home/stephen/dev/src/qtbase-rpi/extprefix/lib/libQt5Core.so.5.3.0 -Wl,-
rpath,/opt/kf5/lib:/opt/vc/lib -Wl,-rpath-link,/home/stephen/rpi/rasp-pi-
rootfs/opt/vc/lib -v
clang version 3.4
Target: arm--linux-gnueabihf
Thread model: posix
Found candidate GCC installation: /home/stephen/rpi/gcc-4.7-linaro-rpi-
gnueabihf/lib/gcc/arm-linux-gnueabihf/4.7.2
Selected GCC installation: /home/stephen/rpi/gcc-4.7-linaro-rpi-
gnueabihf/lib/gcc/arm-linux-gnueabihf/4.7.2
"/home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf/lib/gcc/arm-linux-
gnueabihf/4.7.2/../../../../arm-linux-gnueabihf/bin/ld" --
sysroot=/home/stephen/rpi/rasp-pi-rootfs -z relro -X --hash-style=gnu --
build-id --eh-frame-hdr -m armelf_linux_eabi -shared -dynamic-linker
/lib/ld-linux-armhf.so.3 -o libuser2.so /home/stephen/rpi/rasp-pi-
rootfs/usr/lib/arm-linux-gnueabihf/crti.o /home/stephen/rpi/gcc-4.7-linaro-
rpi-gnueabihf/lib/gcc/arm-linux-gnueabihf/4.7.2/crtbeginS.o -
L/home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf/lib/gcc/arm-linux-
gnueabihf/4.7.2 -L/home/stephen/rpi/gcc-4.7-linaro-rpi-
gnueabihf/lib/gcc/arm-linux-gnueabihf/4.7.2/../../../../arm-linux-
gnueabihf/lib/../lib32 -L/home/stephen/rpi/rasp-pi-rootfs/lib/arm-linux-
gnueabihf -L/home/stephen/rpi/rasp-pi-rootfs/usr/lib/arm-linux-gnueabihf -
L/home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf/lib/gcc/arm-linux-
gnueabihf/4.7.2/../../../../arm-linux-gnueabihf/lib -
L/home/stephen/rpi/rasp-pi-rootfs/lib -L/home/stephen/rpi/rasp-pi-
rootfs/usr/lib -soname libuser2.so CMakeFiles/user2.dir/lib.cpp.o
/home/stephen/dev/src/qtbase-rpi/extprefix/lib/libQt5Widgets.so.5.3.0
/home/stephen/dev/src/qtbase-rpi/extprefix/lib/libQt5Gui.so.5.3.0
/home/stephen/dev/src/qtbase-rpi/extprefix/lib/libQt5Core.so.5.3.0 -rpath
/opt/kf5/lib:/opt/vc/lib -rpath-link /home/stephen/rpi/rasp-pi-
rootfs/opt/vc/lib -lstdc++ -lm -lgcc_s -lc -lgcc_s
/home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf/lib/gcc/arm-linux-
gnueabihf/4.7.2/crtendS.o /home/stephen/rpi/rasp-pi-rootfs/usr/lib/arm-
linux-gnueabihf/crtn.o
Qt( base ) KDE ( )
stephen@hal:~/dev/src/playground/cmake/build{master}$ realpath
/home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf/lib/gcc/arm-linux-
gnueabihf/4.7.2/../../../../arm-linux-gnueabihf/bin/ld
/home/stephen/rpi/gcc-4.7-linaro-rpi-gnueabihf/arm-linux-gnueabihf/bin/ld
I'll do further tests later with other projects and with the QNX toolchain
file.
Thanks,
Steve.
--
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