boost学习笔录-II

如何一次构建debug和release版本？

bjam默认构建debug版本，当通过下面的命令一次性的构建debug和release版本

bjam debug release

结果如下：

|-- config.log
`-- gcc-4.7
|-- debug
|   |-- hello
|   `-- hello.o
`-- release
|-- hello
`-- hello.o

可以一次清除debug和release

bjam --clean debug release

如下：

|-- config.log
`-- gcc-4.7
|-- debug
`-- release

如何构建.jam文件中指定的目标呢？

例如，下面的jam文件：

exe hello1 : hello1.cpp ;
exe hello2 : hello2.cpp ;

通过下面的命令可以分别构建或清除hello2的debug版本

bjam hello2
bjam --clean hello2

如何在bjam构建的时候设置属性呢？

例如，不让编译器使用inline，开启debug符号标识

bjam variant=release inlining=off debug-symbols=on

生成具有名称标识的目录：

-- release
`-- debug-symbols-on
`-- inlining-off
|-- hello1
|-- hello1.o
|-- hello2
`-- hello2.o

在jamfiles中添加目标属性使用不当错误？

exe hello1 : hello1.cpp : <include> boost <threading> multi ;
exe hello2 : hello2.cpp ;

boost multi被解释为路径，中间不可以有空格。

报错：

/usr/share/boost-build/util/path.jam:545: in make-UNIX from module path
error: Empty path passed to 'make-UNIX'
/usr/share/boost-build/util/path.jam:44: in path.make from module path

如何一次编译层级目录？

exe hello1 : hello1.cpp : <include>boost<threading>multi ;
exe hello2 : hello2.cpp ;
build-project app ;

app目录将被构建，app目录之下也会用.jam文件

测试目标依赖的错误问题在哪里？

/usr/share/boost-build/build/targets.jam:566: in start-building from module targets
error: Recursion in main target references
error: the following target are being built currently:
error: ./app ./app
/usr/share/boost-build/build/targets.jam:693: in object(main-target)@78.generate from module object(main-target)@78
/usr/share/boost-build/build/targets.jam:258: in object(project-target)@70.generate from module object(project-target)@70
/usr/share/boost-build/build/targets.jam:848: in targets.generate-from-reference from module targets
/usr/share/boost-build/build/targets.jam:1217: in generate-dependencies from module object(typed-target)@73
/usr/share/boost-build/build/targets.jam:1268: in object(typed-target)@73.generate from module object(typed-target)@73
/usr/share/boost-build/build/targets.jam:732: in generate-really from module object(main-target)@78
/usr/share/boost-build/build/targets.jam:704: in object(main-target)@78.generate from module object(main-target)@78
/usr/share/boost-build/build/targets.jam:258: in object(project-target)@70.generate from module object(project-target)@70
/usr/share/boost-build/build-system.jam:736: in load from module build-system
/usr/share/boost-build/kernel/modules.jam:283: in import from module modules
/usr/share/boost-build/kernel/bootstrap.jam:142: in boost-build from module
/usr/share/boost-build/boost-build.jam:8: in module scope from module

由于首次接触bjam，所以，查了很久，后来发现还是依赖目标写错

lib bar : bar.cpp ;
exe app : app.cpp .//bar ;

.//bar之间是不能有空格的，之前错误是由于它们之间的空格所致。

使用use-project解决目录问题

lib bar : bar.cpp ;$
use-project /library-example/foo : . ;$
exe app : app.cpp /library-example/foo//bar ;$

.当前目录有/library-example/foo替代，如果bar.cpp更新了目录，只需要修改移出即可。目标bar始终使用/library-example/foo//bar替代。