Question

因此，我正在为RIOT OS开发嵌入式库。由于我的库使用的是Cmake，但是RIOT使用简单的Makefile，因此我只编译一个静态库，然后在编译时将此库链接到RIOT。所以我编译了库：我将所有包含文件传递给CMAKE_C_FLAGS 这是必需的，因为我的库使用pthreads，而RIOT支持它。

-DCMAKE_C_FLAGS="-I/home/citrullin/git/riot_libs/core/include -I/home/citrullin/git/riot_libs/drivers/include -I/home/citrullin/git/riot_libs/sys/include -I/home/citrullin/git/riot_libs/boards/native/include -DNATIVE_INCLUDES -I/home/citrullin/git/riot_libs/boards/native/include/ -I/home/citrullin/git/riot_libs/core/include/ -I/home/citrullin/git/riot_libs/drivers/include/ -I/home/citrullin/git/riot_libs/cpu/native/include -I/home/citrullin/git/riot_libs/sys/include -I/home/citrullin/git/riot_libs/cpu/native/include -I/home/citrullin/git/riot_libs/examples/iota_transaction_node/bin/pkg/native/iota-wallet/src -I/home/citrullin/git/riot_libs/sys/posix/include -I/home/citrullin/git/riot_libs/sys/posix/pthread/include" .

所以很好。但是，cmake也试图以某种方式包括posix的Linux头文件。由于它是嵌入式的，因此不应该这样做。

Scanning dependencies of target iota_wallet
[ 11%] Building C object CMakeFiles/iota_wallet.dir/src/iota/addresses.c.obj
In file included from /usr/arm-none-eabi/include/sys/types.h:239:0,
                 from /usr/arm-none-eabi/include/stdio.h:61,
                 from /home/citrullin/git/riot_libs/examples/iota_transaction_node/bin/pkg/bluepill/iota-wallet/src/iota/common.h:4,
                 from /home/citrullin/git/riot_libs/examples/iota_transaction_node/bin/pkg/bluepill/iota-wallet/src/iota/addresses.c:2:
/usr/arm-none-eabi/include/sys/_pthreadtypes.h:154:20: note: previous declaration of 'pthread_mutex_t' was here
 typedef __uint32_t pthread_mutex_t;      /* identify a mutex */

所以，我的问题是：如何告诉cmake不包括Linux头文件？

这是current CMakeList.txt I use.

/ e我用Makefile尝试了相同的操作。同样的问题出现在这里。

make -e CFLAGS="-isystem /usr/arm-none-eabi/include/newlib-nano -I/home/citrullin/git/riot_libs/core/include -I/home/citrullin/git/riot_libs/drivers/include -I/home/citrullin/git/riot_libs/sys/include -I/home/citrullin/git/riot_libs/boards/bluepill/include -I/home/citrullin/git/riot_libs/boards/common/stm32f103c8/include -I/home/citrullin/git/riot_libs/cpu/stm32f1/include -I/home/citrullin/git/riot_libs/cpu/stm32_common/include -I/home/citrullin/git/riot_libs/cpu/cortexm_common/include -I/home/citrullin/git/riot_libs/cpu/cortexm_common/include/vendor -I/home/citrullin/git/riot_libs/sys/libc/include -I/home/citrullin/git/riot_libs/examples/iota_transaction_node/bin/pkg/bluepill/iota-wallet/src -I/home/citrullin/git/riot_libs/sys/posix/include -I/home/citrullin/git/riot_libs/sys/posix/pthread/include" lib
arm-none-eabi-gcc -c -o build/addresses.o src/iota/addresses.c -isystem /usr/arm-none-eabi/include/newlib-nano -I/home/citrullin/git/riot_libs/core/include -I/home/citrullin/git/riot_libs/drivers/include -I/home/citrullin/git/riot_libs/sys/include -I/home/citrullin/git/riot_libs/boards/bluepill/include -I/home/citrullin/git/riot_libs/boards/common/stm32f103c8/include -I/home/citrullin/git/riot_libs/cpu/stm32f1/include -I/home/citrullin/git/riot_libs/cpu/stm32_common/include -I/home/citrullin/git/riot_libs/cpu/cortexm_common/include -I/home/citrullin/git/riot_libs/cpu/cortexm_common/include/vendor -I/home/citrullin/git/riot_libs/sys/libc/include -I/home/citrullin/git/riot_libs/examples/iota_transaction_node/bin/pkg/bluepill/iota-wallet/src -I/home/citrullin/git/riot_libs/sys/posix/include -I/home/citrullin/git/riot_libs/sys/posix/pthread/include
In file included from /home/citrullin/git/riot_libs/sys/posix/pthread/include/pthread.h:38:0,
                 from src/iota/conversion.h:13,
                 from src/iota/addresses.c:8:
/home/citrullin/git/riot_libs/sys/posix/pthread/include/pthread_threading_attr.h:34:3: error: conflicting types for 'pthread_attr_t'
 } pthread_attr_t;
   ^~~~~~~~~~~~~~
In file included from /usr/arm-none-eabi/include/sys/types.h:239:0,
                 from /usr/arm-none-eabi/include/stdio.h:61,
                 from src/iota/addresses.c:2:
/usr/arm-none-eabi/include/sys/_pthreadtypes.h:75:3: note: previous declaration of 'pthread_attr_t' was here
 } pthread_attr_t;
   ^~~~~~~~~~~~~~
In file included from /home/citrullin/git/riot_libs/sys/posix/pthread/include/pthread.h:38:0,
                 from src/iota/conversion.h:13,
                 from src/iota/addresses.c:8:
/home/citrullin/git/riot_libs/sys/posix/pthread/include/pthread_threading_attr.h:39:8: error: redefinition of 'struct sched_param'
 struct sched_param {
        ^~~~~~~~~~~
In file included from /usr/arm-none-eabi/include/sys/_pthreadtypes.h:23:0,
                 from /usr/arm-none-eabi/include/sys/types.h:239,
                 from /usr/arm-none-eabi/include/stdio.h:61,
                 from src/iota/addresses.c:2:
/usr/arm-none-eabi/include/sys/sched.h:48:8: note: originally defined here
 struct sched_param {
        ^~~~~~~~~~~

这些重复的定义错误更多。看起来它们具有相同的性质。

复制步骤：

克隆此repository（分支：iota_new_implementation）
cd进入文件夹examples / iota_transaction_node
执行make

带有Makefile的版本。提交：7e1d8884ab135ae64cee02c8c1a447015f4325bc

带有CMake的版本。提交：dbf32e727889afa3efb466cfdc8561e697af48b0

USEPKG += iota-wallet

该示例的Makefile中的

指向this package。 This Makefile用于创建静态库。

Cmake日志：

Makefile：

Answer 1

使用POSIX标头嵌入的问题不是CMake。这是对该错误的误解。

我认为混乱来自Scanning dependencies of target iota_wallet行，然后是[ 11%] Building C object CMakeFiles/iota_wallet.dir/src/iota/addresses.c.obj行。这是两个不同的步骤，都不涉及CMake。 CMake没有扫描任何东西。当CMake生成Makefile时，它只是将CMakeLists.txt添加为构建依赖项的一部分。这样一来，更新CMakeLists.txt即可在运行make时重新生成新的Makefile。执行此操作时，它会打印Scanning dependencies...。

实际问题出在用arm-none-eabi编译源代码。该编译器附带newlib作为其c库。无论出于何种原因，newlib都包含一些pthread头文件。只要您在源代码中包含诸如stdint.h或stdlib.h之类的头文件，它就会包含sys/types.h，然后再包含sys/_pthreadtypes.h。这与RIOT附带的pthreads头文件冲突。

您可以通过使用-std=c99进行编译来解决此问题。

或者您可以通过编辑文件/usr/arm-none-eabi/include/sys/_pthreadtypes.h解决此问题。

更改：

#if defined(_POSIX_THREADS) || __POSIX_VISIBLE >= 199506

收件人：

#if defined(_POSIX_THREADS)

仅供参考，Makefile和CMake示例仍然存在问题，但与特定问题无关。

有关newlib问题的更多详细信息，请参见https://github.com/RIOT-OS/RIOT/issues/10443。

Answer 2

好吧，首先，请确保已将工具链gcc添加到路径中（参见wiki）

然后，在此github repo和this associated page的基础上，您可以查看一些实际在RIOT中使用CMake的人的例子（这不是我的情况，也不是RIOT开发人员的情况）），他制作了自定义文件来查找RIOT和目标板，因此我认为这对您有帮助。

一旦RIOT检测正常工作，如果pthread问题仍然存在，那么在按照Fred的建议手动编辑系统文件之前，我会考虑尝试将CMake的pthread检测强制带给RIOT：

find_package (Threads REQUIRED PATHS ${RIOT_ROOT}/sys/posix/pthread/include NO_DEFAULT_PATH)

编辑重新考虑该问题，也许我应该澄清一些事情：我认为最重要的想法是您根据the one from the polymcu repo重新格式化CMakeLists.txt以正确设置交叉编译（尤其是设置CMAKE_SYSTEM_NAME）。一旦CMake知道它是交叉编译的，就不应该使用POSIX，它应该导致系统__POSIX_VISIBLE >= 199506部分的include评估为false，从而消除了任何手动编辑的需要。这也是为什么我提出的find_package命令是万不得已的情况，以防万一，应该立即使用。

优先考虑的是正确配置您的CMake，这将使问题自行解决。

嵌入式嵌入式cmake：删除Linux POSIX标头

2 个答案: