I'm trying to use CMake for building a project which uses the MSPGCC cross-compiler for a MSP430 microcontroller. To successfully compile any simple program with it, we need to pass a compile flag indicating the target processor, or else it fails like this:
$ msp430-gcc -o test test.c
In file included from test.c:1:0:
/usr/local/lib/gcc/msp430/4.6.3/../../../../msp430/include/msp430.h:813:2: warning: #warning Unable to identify and include MCU header, use -mmcu=MCU [-Wcpp]
/usr/local/lib/gcc/msp430/4.6.3/../../../../msp430/bin/ld: cannot open linker script file memory.x: No such file or directory
collect2: ld returned 1 exit status
Hence, if I indicate the processor using the -mmcu
switch it works fine. The problem is, although I'm already specifying this in my CMakeLists.txt file:
cmake_minimum_required (VERSION 2.6)
project (test-project C)
set (SOURCES
test.c
)
add_executable (test-project ${SOURCES})
set (CPU_FLAG "-mmcu=msp430f148")
set (CMAKE_C_FLAGS ${CPU_FLAG})
set (CMAKE_EXE_LINKER_FLAGS ${CPU_FLAG})
CMake complains the compiler failed the test to compile a simple program, which I bet is happening because it is probably not using the -mmcu
switch (note the message about not being able to open linker script file memory.x):
$ cd ~/git/test-project
$ mkdir build
$ cd build
$ cmake -DCMAKE_TOOLCHAIN_FILE=../msp430.cmake ..
-- The C compiler identification is GNU 4.6.3
-- Check for working C compiler: /usr/local/bin/msp430-gcc
-- Check for working C compiler: /usr/local/bin/msp430-gcc -- broken
CMake Error at /usr/share/cmake-2.8/Modules/CMakeTestCCompiler.cmake:52 (MESSAGE):
The C compiler "/usr/local/bin/msp430-gcc" is not able to compile a simple
test program.
It fails with the following output:
Change Dir: /home/claudio/git/test-project/build/CMakeFiles/CMakeTmp
Run Build Command:/usr/bin/gmake "cmTryCompileExec2889462763/fast"
/usr/bin/gmake -f CMakeFiles/cmTryCompileExec2889462763.dir/build.make
CMakeFiles/cmTryCompileExec2889462763.dir/build
gmake[1]: Entering directory
`/home/claudio/git/test-project/build/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report
/home/claudio/git/test-project/build/CMakeFiles/CMakeTmp/CMakeFiles 1
Building C object
CMakeFiles/cmTryCompileExec2889462763.dir/testCCompiler.c.o
/usr/local/bin/msp430-gcc -o
CMakeFiles/cmTryCompileExec2889462763.dir/testCCompiler.c.o -c
/home/claudio/git/test-project/build/CMakeFiles/CMakeTmp/testCCompiler.c
Linking C executable cmTryCompileExec2889462763
/usr/bin/cmake -E cmake_link_script
CMakeFiles/cmTryCompileExec2889462763.dir/link.txt --verbose=1
/usr/local/bin/msp430-gcc
CMakeFiles/cmTryCompileExec2889462763.dir/testCCompiler.c.o -o
cmTryCompileExec2889462763 -rdynamic
/usr/local/lib/gcc/msp430/4.6.3/../../../../msp430/bin/ld: cannot open
linker script file memory.x: No such file or directory
collect2: ld returned 1 exit status
gmake[1]: Leaving directory
`/home/claudio/git/test-project/build/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTryCompileExec2889462763] Error 1
gmake: *** [cmTryCompileExec2889462763/fast] Error 2
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:3 (project)
-- Configuring incomplete, errors occurred!
Just for the record, my toolchain file is as follows, and my PATH variable allows it to find the compiler binaries at /usr/local/bin
:
# the name of the target operating system
#SET(CMAKE_SYSTEM_NAME Linux)
# which C and C++ compiler to use
SET(CMAKE_C_COMPILER msp430-gcc)
SET(CMAKE_CXX_COMPILER msp430-g++)
# here is the target environment located
SET(CMAKE_FIND_ROOT_PATH /usr/local/msp430)
# adjust the default behaviour of the FIND_XXX() commands:
# search headers and libraries in the target environment, search
# programs in the host environment
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
All that said, can anyone tell me how to check which compile flags CMake is using to carry the compiler test, and how can we pass custom flags (like -mmcu
, for instance) so it doesn't fail it?
According to the Docs:
http://www.cmake.org/Wiki/CMake_Cross_Compiling#The_toolchain_file
you should use the CMakeForceCompiler thing
INCLUDE(CMakeForceCompiler)
# this one is important
SET(CMAKE_SYSTEM_NAME eCos)
# specify the cross compiler
CMAKE_FORCE_C_COMPILER(arm-elf-gcc GNU)
CMAKE_FORCE_CXX_COMPILER(arm-elf-g++ GNU)
# where is the target environment
SET(CMAKE_FIND_ROOT_PATH /home/alex/src/ecos/install )
# search for programs in the build host directories
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
# for libraries and headers in the target directories
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
(copy&paste from the docs)
Using it fine here for my MSP430 too
来源:https://stackoverflow.com/questions/13012937/how-to-pass-a-compile-flag-to-cmake-initial-compiler-test