CMAKE, derleme işlemi sırasında eksik sysroot eksik

Question

CMAKE ile çapraz derleme ayarlayarak bazı sorunlar yaşıyorum. Kullandığım takım zinciri, cmake dışında mükemmel çalışan yocto'da yaratıldı.

Ben kurulum için bir öğretici aşağıdaki araç zinciri dosyasını takip etmiş

:

SET(CMAKE_SYSTEM_NAME Linux) 
SET(CMAKE_SYSTEM_VERSION 1) 
SET(CMAKE_SYSTEM_PROCESSOR arm) 

# specify the cross compiler 
SET(tools /opt/poky/1.7.1/sysroots/x86_64-pokysdk-linux/usr) 
SET(CMAKE_C_COMPILER ${tools}/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc) 
SET(CMAKE_CXX_COMPILER ${tools}/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc) 

# set sysroot 
SET(CMAKE_SYSROOT /home/sifu/test-yocto/qemuarmdfs) 
#SET(CMAKE_FIND_ROOT_PATH /home/sifu/test-yocto/qemuarm) 

# 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) 
SET(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY) 

Ve aşağıdaki hatayı alıyorum çalışan cmake

The C compiler 
"/opt/poky/1.7.1/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc" 
is not able to compile a simple test program. 

It fails with the following output: 

Change Dir: /home/sifu/Projects/mv/doublepump-single-pump-sw.ss016m21_swapp/cc/CMakeFiles/CMakeTmp 

Run Build Command:/usr/bin/make "cmTryCompileExec4012536451/fast" 

/usr/bin/make -f CMakeFiles/cmTryCompileExec4012536451.dir/build.make 
CMakeFiles/cmTryCompileExec4012536451.dir/build 

make[1]: Entering directory 
`/home/sifu/Projects/mv/doublepump-single-pump-sw.ss016m21_swapp/cc/CMakeFiles/CMakeTmp' 

/usr/bin/cmake -E cmake_progress_report 
/home/sifu/Projects/mv/doublepump-single-pump-sw.ss016m21_swapp/cc/CMakeFiles/CMakeTmp/CMakeFiles 
1 

Building C object 
CMakeFiles/cmTryCompileExec4012536451.dir/testCCompiler.c.o 


/opt/poky/1.7.1/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc 
-O2 -pipe -g -feliminate-unused-debug-types -o 
CMakeFiles/cmTryCompileExec4012536451.dir/testCCompiler.c.o -c 
/home/sifu/Projects/mv/doublepump-single-pump-sw.ss016m21_swapp/cc/CMakeFiles/CMakeTmp/testCCompiler.c 

Linking C executable cmTryCompileExec4012536451 

/usr/bin/cmake -E cmake_link_script 
CMakeFiles/cmTryCompileExec4012536451.dir/link.txt --verbose=1 

/opt/poky/1.7.1/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc 
-O2 -pipe -g -feliminate-unused-debug-types -Wl,-O1 -Wl,--hash-style=gnu 
-Wl,--as-needed CMakeFiles/cmTryCompileExec4012536451.dir/testCCompiler.c.o 
-o cmTryCompileExec4012536451 -rdynamic 

... (A lot of ld errors similar to the one below) 

/opt/poky/1.7.1/sysroots/x86_64-pokysdk-linux/usr/libexec/arm-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/4.9.1/ld: 
cannot find crtn.o: No such file or directory 

collect2: error: ld returned 1 exit status 

make[1]: Leaving directory 
`/home/sifu/Projects/mv/doublepump-single-pump-sw.ss016m21_swapp/cc/CMakeFiles/CMakeTmp' 

elle yukarıda günlüğüne açıklanan gcc komutu çalıştırırsanız --sysroot =/home/sifu/test-yocto/qemuarmdfs ile benim için çalışıyor. Araç zinciri dosyasına sysroot yolu eklendiğinde neden sysroot bayrağını kullanmıyoruz?

Answer 1

Sana CMAKE_C_FLAGS ayarlamanız gerekir düşünüyorum ve ben bu sorunun iki çözümü vardır

include(CMakeForceCompiler) 

Answer 2

gerek Ayrıca

CMAKE_CXX_FLAGS: Ben aşağıdaki kodu kullanabilirsiniz

1. araç zinciri dosyası:

   # compiler 
   set(CMAKE_C_COMPILER /path/to/arm-none-linux-gnueabi-gcc) 
   set(CMAKE_CXX_COMPILER /path/to/arm-none-linux-gnueabi-g++) 
   # sysroot location 
   set(MYSYSROOT /path/to/sysroots/cortexa7-vfp-neon-telechips-linux-gnueabi) 
   # compiler/linker flags 
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --sysroot=${MYSYSROOT}" CACHE INTERNAL "" FORCE) 
   set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} --sysroot=${MYSYSROOT}" CACHE INTERNAL "" FORCE) 
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --sysroot=${MYSYSROOT}" CACHE INTERNAL "" FORCE) 
   set(CMAKE_CXX_LINK_FLAGS "${CMAKE_CXX_LINK_FLAGS} --sysroot=${MYSYSROOT}" CACHE INTERNAL "" FORCE) 
   # cmake built-in settings to use find_xxx() functions 
   set(CMAKE_FIND_ROOT_PATH "${MYSYSROOT}") 
   set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER) 
   set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY) 
   set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY) 
   

2. İkinci çözüm, toolchain dosyasında CMakeForceCompiler paketini kullanmaktır. Bu farklı görünüyor ama aynı sonucu vardır: çünkü mevcut CKağıt v3.0 beri sadece

   # compiler 
   include(CMakeForceCompiler) 
   cmake_force_c_compiler(/path/to/arm-none-linux-gnueabi-gcc GNU) 
   cmake_force_cxx_compiler(/path/to/arm-none-linux-gnueabi-g++ GNU) 
   # sysroot location 
   set(MYSYSROOT /path/to/sysroots/cortexa7-vfp-neon-telechips-linux-gnueabi) 
   # compiler/linker flags 
   add_definitions("--sysroot=${MYSYSROOT}") 
   set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} --sysroot=${MYSYSROOT}" CACHE INTERNAL "" FORCE) 
   set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} --sysroot=${MYSYSROOT}" CACHE INTERNAL "" FORCE) 
   # cmake built-in settings to use find_xxx() functions 
   set(CMAKE_FIND_ROOT_PATH ${MYSYSROOT}) 
   set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER) 
   set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY) 
   set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY) 
   

BTW, CMAKE_SYSROOT değişkeni kullanamazsınız.