源码编译dotnetcore的runtime

为了dotnetcore运行时的安可目标，特意在国庆假期研究了怎么编译dotnetcore的runtime。由于我们用的是.net6，最新的是8，所以从github下载的.net6的分支代码进行的编译。查遍了国内外资料，估计微软服务太体贴了，竟然没什么编译runtime的资料参照，而开始我也没翻源码doc的文档就自己猜着试了。整体试了4-5天总算自己给完全编译ok了，分享给需要安可的小伙伴，麻烦的应该就是runtime的编译了，因为涉及到cli的c++代码和环境依赖，后面再编译asp.netcore代码。虽然整个过程很痛苦，一直看编译报错和翻他的编译脚本及解决依赖问题和各种尝试。但是收获很多，C#编程环境更可控了，对Linux下c编译更加熟悉了。

成功编译的runtime

首先到开源的dotnet官网下载自己要编译的分支代码到本地

然后把下载的代码上传到linux的根下解压

代码大体层级，这个我是编译成功才翻文档的，早知道文档很明确就不用走这么多弯路了

Linux下的编译文档

Linux下用docker编译的镜像地址，不过国内网不好

dotnetcore编译的docker镜像地址，能够下载镜像的话应该镜像会容易些，不用解决复杂的依赖问题

| OS                          | Target Arch     | Image location                                                                                       | crossrootfs location | Clang Version |
| --------------------------- | --------------- | ---------------------------------------------------------------------------------------------------- | -------------------- | ------------- |
| Ubuntu 16.04                | x64             | `mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-a50a721-20191120200116`                    | -                    | -clang9       |
| Alpine                      | x64             | `mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.9-WithNode-20200602002639-0fc54a3`             | -                    | -clang5.0     |
| CentOS 7 (build for RHEL 7) | x64             | `mcr.microsoft.com/dotnet-buildtools/prereqs:centos-7-359e48e-20200313130914`                        | -                    | -clang9       |
| Ubuntu 16.04                | arm32 (armhf)   | `mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-cross-20200413125008-09ec757`              | `/crossrootfs/arm`   | -clang9       |
| Ubuntu 16.04                | arm64 (arm64v8) | `mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-cross-arm64-20201022204150-b2c2436`        | `/crossrootfs/arm64` | -clang9       |
| Alpine                      | arm64 (arm64v8) | `mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-cross-arm64-alpine-20200413125008-406629a` | `/crossrootfs/arm64` | -clang9       |

Linux下编译环境具体介绍，参照这个文档应该更准确

以下是我自己在CentOS7的编译经历，最终执行的编译命令是./build.sh --gcc指定用gcc编译了。

首先第一次运行build.sh时候他会下载一个版本的dotnetsdk来支持编译.net得基础库，这个下载很慢，而且没告诉下载到什么地方，

翻他的脚步发现他是把包下载到/root/下dotnet的隐藏文件了，可以把隐藏文件备份处理后面放进去就行了，避免每次下载.net环境慢。也能改他sh脚本的下载地址。

这里cmake版本要对，gcc要比较新，我试的好使的是gcc9,CentOS7默认gcc是4.8，需要升级。cmake也没有要求的版本，需要源码安装。

升级gcc

sudo yum install centos-release-scl
sudo yum install devtoolset-9-gcc*
scl enable devtoolset-9 bash
echo "source /opt/rh/devtoolset-9/enable" >>/etc/profile

编译如果确实新版gcc头文件也是从gcc源码拷贝上传来解决

cmacke源码安装，下载地址https://cmake.org/files/

tar -zxvf cmake-3.16.4-Linux-x86_64.tar.gz
vi /etc/profile
export PATH=$PATH:/cmake-3.16.4-Linux-x86_64/bin
source /etc/profile

vi ~/.bashrc
export PATH=$PATH:/cmake-3.16.4-Linux-x86_64/bin

缺少ttng头文件，这里要安装ttng软件，安装后了还是在usr/include下没头文件，我又到ttng官网下载源码把头文件上传上去才解决，这里也消耗了大量时间。

把下载的源码的头文件上传到/usr/include，其他包缺头文件也是同样处理

cmake版本不对，太高了也不行，太低了也不行。这里按文档要求安装就行。这个事情我消耗了太多时间，版本低了有些代码编译报错，用最新的cmake有的写法已经移除不支持了。

缺少ninja，用yum安装就行

编译成功之后后期操作又缺Python3，由于CentOS7默认安装的是2.7，还不能卸载默认的，卸载默认的之后yum会使用有问题，yum依赖的Python

/bin/sh: Python3_EXECUTABLE-NOTFOUND: command not found

首先从https://www.python.org/ftp/python/3.7.1/Python-3.7.1.tgz下载Python3源码，上传到Linux上编译

先安装依赖,之前我安装里gcc和make额，没安装的先安装编译器

yum install libffi-devel -y

然后进入Python3代码目录生成makefile

chmod +x configure
./configure --prefix=/usr/local

执行编译和编译安装

make
make install

测试

python3 -V
pip -V

都搞定之后执行./build.sh --gcc就是漫长的编译过程了，持续十几分钟能编译完，下面是几个大概的片段

 -- Performing Test HAVE_FDS_BITS - Failed
  -- Performing Test HAVE_PRIVATE_FDS_BITS
  -- Performing Test HAVE_PRIVATE_FDS_BITS - Failed
  -- Performing Test HAVE_SENDFILE_4
  -- Performing Test HAVE_SENDFILE_4 - Success
  -- Performing Test HAVE_SENDFILE_6
  -- Performing Test HAVE_SENDFILE_6 - Failed
  -- Performing Test HAVE_SENDFILE_7
  -- Performing Test HAVE_SENDFILE_7 - Failed
  -- Looking for fcopyfile
  -- Looking for fcopyfile - not found
  -- Looking for include file sys/sockio.h
  -- Looking for include file sys/sockio.h - not found
  -- Looking for include file linux/ethtool.h
  -- Looking for include file linux/ethtool.h - found
  -- Looking for include file sys/poll.h
  -- Looking for include file sys/poll.h - found
  -- Looking for include file sys/proc_info.h
  -- Looking for include file sys/proc_info.h - not found
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  -- Looking for accept4 - found
  -- Looking for kqueue
  -- Looking for kqueue - not found
  -- Looking for disconnectx
  -- Looking for disconnectx - not found
  -- Performing Test HAVE_GETNAMEINFO_SIGNED_FLAGS
  -- Performing Test HAVE_GETNAMEINFO_SIGNED_FLAGS - Success
  -- Looking for malloc_size
  -- Looking for malloc_size - not found
  -- Looking for malloc_usable_size
  -- Looking for malloc_usable_size - found
  -- Looking for malloc_usable_size
  -- Looking for malloc_usable_size - not found
  -- Looking for posix_memalign
  -- Looking for posix_memalign - found
  -- Looking for aligned_alloc
  -- Looking for aligned_alloc - found
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************************************************************************
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  ApiCompat -> 
  Trimming linux-x64 runtime pack assemblies with ILLinker...
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  /runtime-6.0.22/artifacts/obj/Microsoft.NETCore.App.Runtime.Composite/Debug/net6.0/linux-x64/symbols/ -> /runtime-6.0.22/artifacts/packages/Debug/Shipping//dotnet-runtime-composite-symbols-linux-x64-6.0.22.tar.gz
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  Microsoft.NETCore.App.Composite.Bundle -> 
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  Microsoft.NETCore.App.Ref -> 
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  Successfully created package '/runtime-6.0.22/artifacts/packages/Debug/Shipping/Microsoft.NETCore.App.Ref.6.0.22.nupkg'.
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  Microsoft.NETCore.App.Host -> 
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  dotnet-runtime-deps-centos.7 -> 
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  /runtime-6.0.22/artifacts/obj/Microsoft.NETCore.App.Runtime/Debug/net6.0/linux-x64/symbols/ -> /runtime-6.0.22/artifacts/packages/Debug/Shipping//dotnet-runtime-symbols-linux-x64-6.0.22.tar.gz
  Successfully created package '/runtime-6.0.22/artifacts/packages/Debug/Shipping/Microsoft.NETCore.App.Runtime.linux-x64.6.0.22.nupkg'.
  Successfully created package '/runtime-6.0.22/artifacts/packages/Debug/Shipping/Microsoft.NETCore.App.Runtime.linux-x64.6.0.22.symbols.nupkg'.
  Microsoft.NETCore.App.Bundle -> 
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  Microsoft.NET.HostModel -> /runtime-6.0.22/artifacts/bin/Microsoft.NET.HostModel/Debug/netstandard2.0/Microsoft.NET.HostModel.dll
  Successfully created package '/runtime-6.0.22/artifacts/packages/Debug/NonShipping/Microsoft.NET.HostModel.6.0.22-dev.nupkg'.
  Successfully created package '/runtime-6.0.22/artifacts/packages/Debug/NonShipping/Microsoft.NET.HostModel.6.0.22-dev.symbols.nupkg'.
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  BundleHelper -> /runtime-6.0.22/artifacts/bin/BundleHelper/Debug/net6.0/BundleHelper.dll
  Microsoft.NET.HostModel.ComHost.Tests -> /runtime-6.0.22/artifacts/bin/Microsoft.NET.HostModel.ComHost.Tests/Debug/net6.0/Microsoft.NET.HostModel.ComHost.Tests.dll
  Microsoft.DotNet.CoreSetup.Packaging.Tests -> /runtime-6.0.22/artifacts/bin/Microsoft.DotNet.CoreSetup.Packaging.Tests/Debug/net6.0/Microsoft.DotNet.CoreSetup.Packaging.Tests.dll
  Microsoft.NET.HostModel.AppHost.Tests -> /runtime-6.0.22/artifacts/bin/Microsoft.NET.HostModel.AppHost.Tests/Debug/net6.0/Microsoft.NET.HostModel.AppHost.Tests.dll
  AppHost.Bundle.Tests -> /runtime-6.0.22/artifacts/bin/AppHost.Bundle.Tests/Debug/net6.0/AppHost.Bundle.Tests.dll
  Microsoft.NET.HostModel.Bundle.Tests -> /runtime-6.0.22/artifacts/bin/Microsoft.NET.HostModel.Bundle.Tests/Debug/net6.0/Microsoft.NET.HostModel.Bundle.Tests.dll

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:29:43.24

开心 安全可控达标，用实际证明jdk可以国内控制编译；dotnet也可以，还是我自己编译可控的，哈哈