如何在yocto中指定较旧的gcc版本

Question

我正在尝试使用yocto(zeus分支机构(为英伟达捷信纳米板构建图像，以下是我的配置：

Build Configuration:
BB_VERSION           = "1.44.0"
BUILD_SYS            = "x86_64-linux"
NATIVELSBSTRING      = "universal"
TARGET_SYS           = "aarch64-poky-linux"
MACHINE              = "jetson-nano"
DISTRO               = "poky"
DISTRO_VERSION       = "3.0.2"
TUNE_FEATURES        = "aarch64 armv8a crc"
TARGET_FPU           = ""
meta                 
meta-poky            
meta-yocto-bsp       = "zeus:5e1f52edb7a9f790fb6cb5d96502f3690267c1b1"
meta-python          
meta-filesystems     
meta-oe              
meta-multimedia      = "zeus:bb65c27a772723dfe2c15b5e1b27bcc1a1ed884c"
meta-tegra           = "zeus:23a9f6c12a741b4067d7a2ee601b98c766850e47"

但是我得到了以下错误：

| /home/rui/projects/embeddeddfit/yocto/jetson-nano-build/tmp/work/armv8a_tegra210-poky-linux/cuda-samples/10.0.326-1-r0/recipe-sysroot/usr/local/cuda-10.0/include/crt/host_config.h:129:2: error: #error -- unsupported GNU version! gcc versions later than 7 are not supported!
|   129 | #error -- unsupported GNU version! gcc versions later than 7 are not supported!
|       |  ^~~~~
| Makefile:327: recipe for target 'UnifiedMemoryStreams.o' failed
| make: *** [UnifiedMemoryStreams.o] Error 1
| ERROR: oe_runmake failed
| WARNING: exit code 1 from a shell command.
| ERROR: Execution of '/home/rui/projects/embeddeddfit/yocto/jetson-nano-build/tmp/work/armv8a_tegra210-poky-linux/cuda-samples/10.0.326-1-r0/temp/run.do_compile.24230' failed with exit code 1:
| test.c:1:10: fatal error: omp.h: No such file or directory
|     1 | #include <omp.h>
|       |          ^~~~~~~
| compilation terminated.

在我看来，这是一个版本兼容性问题。

在我的本地.conf中我有：

MACHINE = "jetson-nano"
LICENSE_FLAGS_WHITELIST = "commercial"
IMAGE_CLASSES += "image_types_tegra"
IMAGE_FSTYPES = "tegraflash"
GCCVERSION = "7.%"
CUDA_VERSION="10.0"
IMAGE_INSTALL_append = " cuda-samples"

指定了7.x版本，但yocto没有找到任何兼容的版本

NOTE: Resolving any missing task queue dependencies
NOTE: preferred version 7.% of gcc-cross-aarch64 not available (for item virtual/aarch64-poky-linux-gcc)
NOTE: versions of gcc-cross-aarch64 available: 9.2.0

如何强制yocto使用7.x版本，或者如何使yocto检测7.x版本？

Answer 1

gcc配方位于中

sources/poky/meta/recipes-devtools/gcc/

如果你有一个不同于你想要的版本，你必须下载/制作另一个食谱。

Answer 2

这是meta tegra特制酱汁。自述：

CUDA 10仅支持高达gcc 7，并且提供了一些NVIDIA二进制库似乎是用g++7编译的，并导致链接器使用g++6构建应用程序时失败，因此只有gcc7应该如果您打算使用CUDA，请使用。请参阅以下wiki页面关于在构建中包含gcc7的说明：

使用来自contrib层的gcc7

使用linaro gcc7实现CUDA支持

通常，在开始使用层时，最好通读README层。