我正在尝试建立一个简单的 bjam 构建示例，在其中，我在顶层SubDir文件中使用了Jamroot.jam规则：
SubDir TOP ;
exe main : main.cpp ;
我正在使用boost_1_58_0，当我忽略了SubDir指令时，构建工作正常。
但是当我尝试使用SubDir时， bjam 声称该规则是未知的……尽管我看到Jambase文件已被解析：
dirkb@wks91:bjam_try$ BOOST_BUILD_ROOT=/home/dirkb/snaps/git/boost_1_58_0 BOOST_ROOT=/home/dirkb/snaps/git/boost_1_58_0 /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/engine/bin.linuxx86_64/b2 -f Jambase --debug-loading --debug-configuration
Parsing file: Jambase
notice: found boost-build.jam at /home/dirkb/snaps/git/boost_1_58_0/boost-build.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/boost-build.jam
notice: loading Boost.Build from /home/dirkb/snaps/git/boost_1_58_0/tools/build/src
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/bootstrap.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/kernel/bootstrap.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/kernel/modules.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/kernel/modules.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util/option.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build-system.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/build-request.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/kernel/class.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util/numbers.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/kernel/errors.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util/sequence.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util/assert.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util/set.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util/regex.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/feature.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util/indirect.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util/utility.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/property.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util/path.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util/string.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util/container.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/builtin.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/alias.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/project.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util/print.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/scanner.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/property-set.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/virtual-target.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/type.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/generators.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util/os.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/common.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/toolset.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util/order.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/targets.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/stage.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/types/register.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/types/asm.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/types/cpp.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/types/exe.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/types/html.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/types/lib.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/types/obj.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/types/objc.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/types/preprocessed.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/types/qt.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/types/rsp.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/symlink.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/message.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/convert.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/generate.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/configure.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/config-cache.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools/make.jam
Parsing file: /home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/version.jam
Initializing project 'test-config'
Assigned project target object(project-target)@62 to 'test-config'
Initializing project 'site-config'
Assigned project target object(project-target)@64 to 'site-config'
notice: Searching '/etc' '/home/dirkb' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src' '/usr/share/boost-build' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/kernel' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/contrib' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/.' for site-config configuration file 'site-config.jam'.
notice: Configuration file 'site-config.jam' not found in '/etc' '/home/dirkb' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src' '/usr/share/boost-build' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/kernel' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/contrib' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/.'.
Initializing project 'user-config'
Assigned project target object(project-target)@66 to 'user-config'
notice: Searching '/home/dirkb' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src' '/usr/share/boost-build' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/kernel' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/contrib' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/.' for user-config configuration file 'user-config.jam'.
notice: Configuration file 'user-config.jam' not found in '/home/dirkb' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src' '/usr/share/boost-build' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/kernel' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/util' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/tools' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/contrib' '/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/.'.
Loading Jamfile at '.'
Initializing project 'Jamfile</disk2/stuff/dirkb/snaps/git/bjam_try>'
Assigned project target object(project-target)@68 to 'Jamfile</disk2/stuff/dirkb/snaps/git/bjam_try>'
Parsing file: Jamroot.jam
Jamroot.jam:1: in modules.load
ERROR: rule "SubDir" unknown in module "Jamfile</disk2/stuff/dirkb/snaps/git/bjam_try>".
/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/project.jam:325: in load-jamfile
/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/project.jam:64: in load
/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build/project.jam:145: in project.find
/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/build-system.jam:535: in load
/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/kernel/modules.jam:289: in import
/home/dirkb/snaps/git/boost_1_58_0/tools/build/src/kernel/bootstrap.jam:139: in boost-build
/home/dirkb/snaps/git/boost_1_58_0/boost-build.jam:17: in module scope
dirkb@wks91:bjam_try$
Jambase文件和一个简单的Jamrules位于我的玩具项目的顶层。当我忽略“ -f Jambase”选项时， bjam 选择内部Jambase定义（+），但产生的结果相同... SubDir是未知的。
当我使用选项“ -d 12启动 bjam 时，我发现SubDir中的Jambase规则已被正确扫描，但是由于某种原因它不正确绑定，定义或 bjam 通常所做的使方法/规则“可用”的事情。
正如您可能从使用的路径中看到的那样，我仅引导了b2，因此boost尚未正确安装。为了进行调试，我还修补了一些源代码，这就是“ Parsing file...”消息的来源。
如何正确地从Jambase文件中“注入”规则定义，以便在解析Jamfile时知道它们？
答案 0 :(得分：0)
TL; DR ：如果您的项目包含的Jamfile引用了SubDir文件中的Jambase之类的定义，请不要试图使用 bjam < / em> / b2 。改用 ft-jam ！
详细答案以及其他一些背景信息：
在工作中，我尝试从以下版本构建旧软件包（Ingres DBMS 10.1）
来源超过两个星期。它包含Jamfile和Jamrules个文件
在其树形结构中，所以我得出结论，我将不得不使用 bjam / b2
使事情进展。该项目的文档不够具体
事实证明了这一点。
我有一个主要问题，Jamfiles将使用很多定义
来自“ Jambase”文件，例如“ SubDir”。每当我开始
构建中，我将收到错误“ unknown rule”，您也可以在
问题。
我最终决定尝试使用较旧的Jam版本，瞧瞧：
ft-jam v2.5.2完美地编译了该项目，没有任何进一步的工作。是的！
所以，基本上现在一切都很好，我可以使用ft-jam
目的。但是我仍然想知道我是否还可以将bjam / b2用于
编译。内部Jambase定义（“ +”
文件）和bjam中的“ -f”选项？它仅用于引导b2
本身，还是我可以在运行b2时使用它？如果是，如何激活它？
最后，我写信给boost-build邮件列表，并得到以下答复：
b2不是Perforce Jam的直接替代品。使用ft-jam是 正确的选项。
当前的Jambase仅用于引导Boost.Build。较旧 b2版本具有原始Jambase的副本，即 如果可执行文件的名称不是b2 / bjam，则被激活。 即使这样，我也不建议您使用它，因为它完全不需要维护。