交叉编译aws webrtc库失败

Question

我试图交叉编译ARM的aws webrtc库（https://github.com/awslabs/amazon-kinesis-video-streams-webrtc-sdk-c）。所以我按照readme.md上的说明操作，但失败了。

我所做的

export CC=arm-linux-gnueabihf-gcc
export CXX=arm-linux-gnueabihf-g++
cmake .. -DBUILD_TEST=TRUE -DBUILD_OPENSSL=TRUE -DBUILD_STATIC_LIBS=TRUE -DBUILD_OPENSSL_PLATFORM=linux-generic32 -DBUILD_LIBSRTP_HOST_PLATFORM=x86_64-pc-linux-gnu -DBUILD_LIBSRTP_DESTINATION_PLATFORM=arm-unknown-linux-uclibcgnueabi

我遇到的错误

Scanning dependencies of target kvsCommonLws
[ 26%] Building C object CMakeFiles/kvsCommonLws.dir/src/source/Common/Auth.c.o
In file included from /home/jacob/Workspace/Github/amazon-kinesis-video-streams-webrtc-sdk-c/open-source/libkvsCommonLws/build/src/libkvsCommonLws-download/src/source/Common/Include_i.h:41,
                 from /home/jacob/Workspace/Github/amazon-kinesis-video-streams-webrtc-sdk-c/open-source/libkvsCommonLws/build/src/libkvsCommonLws-download/src/source/Common/Auth.c:5:
/home/jacob/Workspace/Github/amazon-kinesis-video-streams-webrtc-sdk-c/open-source/include/libwebsockets.h:120:10: fatal error: sys/capability.h: No such file or directory
  120 | #include <sys/capability.h>
      |          ^~~~~~~~~~~~~~~~~~
compilation terminated.
CMakeFiles/kvsCommonLws.dir/build.make:62: recipe for target 'CMakeFiles/kvsCommonLws.dir/src/source/Common/Auth.c.o' failed
make[5]: *** [CMakeFiles/kvsCommonLws.dir/src/source/Common/Auth.c.o] Error 1
make[4]: *** [CMakeFiles/kvsCommonLws.dir/all] Error 2
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/kvsCommonLws.dir/all' failed
Makefile:129: recipe for target 'all' failed
CMakeFiles/libkvsCommonLws-download.dir/build.make:111: recipe for target 'build/src/libkvsCommonLws-download-stamp/libkvsCommonLws-download-build' failed
make[3]: *** [all] Error 2
make[2]: *** [build/src/libkvsCommonLws-download-stamp/libkvsCommonLws-download-build] Error 2
make[1]: *** [CMakeFiles/libkvsCommonLws-download.dir/all] Error 2
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/libkvsCommonLws-download.dir/all' failed
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2
CMake Error at CMake/Utilities.cmake:65 (message):
  CMake step for libkvsCommonLws failed: 2
Call Stack (most recent call first):
  CMakeLists.txt:150 (build_dependency)

Answer 1

您的ARM工具链或构建系统如何使用它有问题。你从哪里得到的，怎么安装的？

标头sys/capability.h包含在ARM工具链中。例如，当我安装Debian包gcc-arm-linux-gnueabihf时，这个头文件被复制到/usr/arm-linux-gnueabihf/include/linux/capability.h。工具链应该自己在那里找到它。

命令arm-linux-gnueabihf-gcc-v将向您显示工具链的配置位置，以查找它自己的头文件。例如。在下面的输出中，重要的是--includedir=/usr/arm-linux-gnueabihf/include，应该找到相对于该目录的标头。我为超长的队伍道歉。

$ arm-linux-gnueabihf-gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/arm-linux-gnueabihf-gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc-cross/arm-linux-gnueabihf/10/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: ../src/configure -v --with-pkgversion='Debian 10.2.1-1' --with-bugurl=file:///usr/share/doc/gcc-10/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-10 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libitm --disable-libquadmath --disable-libquadmath-support --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --without-target-system-zlib --enable-multiarch --disable-sjlj-exceptions --with-arch=armv7-a --with-fpu=vfpv3-d16 --with-float=hard --with-mode=thumb --disable-werror --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=arm-linux-gnueabihf --program-prefix=arm-linux-gnueabihf- --includedir=/usr/arm-linux-gnueabihf/include --with-build-config=bootstrap-lto-lean --enable-link-mutex
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.1 20201207 (Debian 10.2.1-1)

您还可以尝试增加cmake构建过程的冗长性，以验证它是否调用了正确的交叉编译器。我已经忘记了细节，但是添加一个标志-v可能会有所帮助。