如何在 Yocto 生成的 SDK 中使用头文件 <xmmintrin.h>？
How to use header file <xmmintrin.h> with Yocto-generated SDK?
我在使用 Yocto 生成的 SDK 时遇到问题：尝试使用 SDK 进行编译时找不到头文件 xmmintrin.h。示例：
$ echo '#include <xmmintrin.h>' > t.cpp
$ $CXX $CXXFLAGS -no-canonical-prefixes -c t.cpp
t.cpp:1:10: fatal error: 'xmmintrin.h' file not found
$CXX 指向 SDK 的 clang++。
详细输出是：
$ $CXX $CXXFLAGS -no-canonical-prefixes -c t.cpp -v
clang version 6.0.0 (git://github.com/llvm-mirror/clang.git ff0c0d8ab3e316bb6e2741fedb3b545e198eab7a) (git://github.com/llvm-mirror/llvm.git 089d4c0c490687db6c75f1d074e99c4d42936a50)
Target: x86_64-poky-linux-musl
Thread model: posix
InstalledDir: /opt/poky-tiny/2.4.2/sysroots/x86_64-pokysdk-linux/usr/bin/x86_64-poky-linux-musl
Found candidate GCC installation: /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/lib//x86_64-poky-linux-musl/7.3.0
Found candidate GCC installation: /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/lib/gcc/x86_64-poky-linux-musl/7.3.0
Selected GCC installation: /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/lib//x86_64-poky-linux-musl/7.3.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
"/opt/poky-tiny/2.4.2/sysroots/x86_64-pokysdk-linux/usr/bin/x86_64-poky-linux-musl/x86_64-poky-linux-musl-clang++" -cc1 -triple x86_64-poky-linux-musl -emit-obj -disable-free -disable-llvm-verifier -discard-value-names -main-file-name t.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mthread-model posix -fmath-errno -mfpmath sse -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu core2 -target-feature +sse3 -dwarf-column-info -debug-info-kind=limited -dwarf-version=4 -debugger-tuning=gdb -momit-leaf-frame-pointer -v -coverage-notes-file /home/kamo7631/t.gcno -rpokyurce-dir /opt/poky-tiny/2.4.2/sysroots/x86_64-pokysdk-linux/usr/bin/lib/clang/6.0.0 -isysroot /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl -internal-isystem /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/include/c++/v1 -internal-isystem /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/local/include -internal-isystem /opt/poky-tiny/2.4.2/sysroots/x86_64-pokysdk-linux/usr/bin/lib/clang/6.0.0/include -internal-externc-isystem /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/include -internal-externc-isystem /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/include -O2 -fdeprecated-macro -fdebug-compilation-dir /home/kamo7631 -ferror-limit 19 -fmessage-length 132 -fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp -o t.o -x c++ t.cpp
clang -cc1 version 6.0.0 based upon LLVM 6.0.0 default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/local/include"
ignoring nonexistent directory "/opt/poky-tiny/2.4.2/sysroots/x86_64-pokysdk-linux/usr/bin/lib/clang/6.0.0/include"
ignoring nonexistent directory "/opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/include"
#include "..." search starts here:
#include <...> search starts here:
/opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/include/c++/v1
/opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/include
End of search list.
t.cpp:1:10: fatal error: 'xmmintrin.h' file not found
#include <xmmintrin.h>
^~~~~~~~~~~~~
1 error generated.
头文件显示为 sysroots/x86_64-pokysdk-linux/usr/lib/clang/6.0.0/include/xmmintrin.h，但在 sysroots/core2-64-poky-linux-musl（目标 sysroot）中找不到任何地方。
我需要更改什么才能使用 SDK 中的这个头文件和其他头文件？
请post输出
$CLANGCXX $CXXFLAGS -no-canonical-prefixes -c t.cpp -v
我认为问题是 SDK 中的错误，编译器正在寻找包含路径
编译器头文件但在错误的目录中。也许它指向 sysroots/x86_64-pokysdk-linux/usr/bin/lib/clang/6.0.0/include
您可以尝试将 -I ${OECORE_NATIVE_SYSROOT}/usr/lib/clang/6.0.0/include 添加到您的编译器命令行。还要确保你有 SDK 安装目录顶部的 SDK 环境脚本的来源，它的名字是这样开头的 "environment-setup-"
我在使用 Yocto 生成的 SDK 时遇到问题：尝试使用 SDK 进行编译时找不到头文件 xmmintrin.h。示例：
$ echo '#include <xmmintrin.h>' > t.cpp
$ $CXX $CXXFLAGS -no-canonical-prefixes -c t.cpp
t.cpp:1:10: fatal error: 'xmmintrin.h' file not found
$CXX 指向 SDK 的 clang++。
详细输出是：
$ $CXX $CXXFLAGS -no-canonical-prefixes -c t.cpp -v
clang version 6.0.0 (git://github.com/llvm-mirror/clang.git ff0c0d8ab3e316bb6e2741fedb3b545e198eab7a) (git://github.com/llvm-mirror/llvm.git 089d4c0c490687db6c75f1d074e99c4d42936a50)
Target: x86_64-poky-linux-musl
Thread model: posix
InstalledDir: /opt/poky-tiny/2.4.2/sysroots/x86_64-pokysdk-linux/usr/bin/x86_64-poky-linux-musl
Found candidate GCC installation: /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/lib//x86_64-poky-linux-musl/7.3.0
Found candidate GCC installation: /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/lib/gcc/x86_64-poky-linux-musl/7.3.0
Selected GCC installation: /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/lib//x86_64-poky-linux-musl/7.3.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
"/opt/poky-tiny/2.4.2/sysroots/x86_64-pokysdk-linux/usr/bin/x86_64-poky-linux-musl/x86_64-poky-linux-musl-clang++" -cc1 -triple x86_64-poky-linux-musl -emit-obj -disable-free -disable-llvm-verifier -discard-value-names -main-file-name t.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mthread-model posix -fmath-errno -mfpmath sse -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu core2 -target-feature +sse3 -dwarf-column-info -debug-info-kind=limited -dwarf-version=4 -debugger-tuning=gdb -momit-leaf-frame-pointer -v -coverage-notes-file /home/kamo7631/t.gcno -rpokyurce-dir /opt/poky-tiny/2.4.2/sysroots/x86_64-pokysdk-linux/usr/bin/lib/clang/6.0.0 -isysroot /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl -internal-isystem /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/include/c++/v1 -internal-isystem /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/local/include -internal-isystem /opt/poky-tiny/2.4.2/sysroots/x86_64-pokysdk-linux/usr/bin/lib/clang/6.0.0/include -internal-externc-isystem /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/include -internal-externc-isystem /opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/include -O2 -fdeprecated-macro -fdebug-compilation-dir /home/kamo7631 -ferror-limit 19 -fmessage-length 132 -fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp -o t.o -x c++ t.cpp
clang -cc1 version 6.0.0 based upon LLVM 6.0.0 default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/local/include"
ignoring nonexistent directory "/opt/poky-tiny/2.4.2/sysroots/x86_64-pokysdk-linux/usr/bin/lib/clang/6.0.0/include"
ignoring nonexistent directory "/opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/include"
#include "..." search starts here:
#include <...> search starts here:
/opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/include/c++/v1
/opt/poky-tiny/2.4.2/sysroots/core2-64-poky-linux-musl/usr/include
End of search list.
t.cpp:1:10: fatal error: 'xmmintrin.h' file not found
#include <xmmintrin.h>
^~~~~~~~~~~~~
1 error generated.
头文件显示为 sysroots/x86_64-pokysdk-linux/usr/lib/clang/6.0.0/include/xmmintrin.h，但在 sysroots/core2-64-poky-linux-musl（目标 sysroot）中找不到任何地方。
我需要更改什么才能使用 SDK 中的这个头文件和其他头文件？
请post输出
$CLANGCXX $CXXFLAGS -no-canonical-prefixes -c t.cpp -v
我认为问题是 SDK 中的错误，编译器正在寻找包含路径 编译器头文件但在错误的目录中。也许它指向 sysroots/x86_64-pokysdk-linux/usr/bin/lib/clang/6.0.0/include
您可以尝试将 -I ${OECORE_NATIVE_SYSROOT}/usr/lib/clang/6.0.0/include 添加到您的编译器命令行。还要确保你有 SDK 安装目录顶部的 SDK 环境脚本的来源，它的名字是这样开头的 "environment-setup-"