[Boost-build] default value for composite feature always used

Subject: [Boost-build] default value for composite feature always used
From: Nogradi, Chris (Chris.Nogradi_at_[hidden])
Date: 2012-04-09 11:17:29

Hello,

I am doing the following:

import feature ;

feature.feature test : E A B C D : composite ;
feature.compose <test>A : <define>_TEST=0 ;
feature.compose <test>B : <define>_TEST=1 ;
feature.compose <test>C : <define>_TEST=2 ;
feature.compose <test>D : <define>_TEST=3 ;
feature.compose <test>E : <define>_TEST=4 ;

exe main : main.c : <test>A ;

And for some reason, _TEST=4 is always set even though I am specifying that <test>A  (_TEST=0 is also set) should be used. I am obviously misunderstanding the documentation regarding the default value of test since I would have expected it to not be used in this case.  Can someone explain why this is happening and how I can have a default value set when <test> is not specified but when it is specified, have it use the specified value not the default?

$ boost-build/bin/bjam.exe -d2 -a
...found 11 targets...
...updating 3 targets...

file bin\msvc-8.0\debug\test-A\threading-multi\main.obj.rsp
"main.c" -Fo"bin\msvc-8.0\debug\test-A\threading-multi\main.obj"    -TC /Z7 /Od /Ob0 /W3 /GR /MDd /Zc:forScope /Zc:wchar_t -c
-D_TEST=0
-D_TEST=4
compile-c-c++ bin\msvc-8.0\debug\test-A\threading-multi\main.obj

    call "C:\Program Files (x86)\Microsoft Visual Studio 8\VC\vcvarsall.bat" x86 >nul
cl /Zm800 -nologo @"bin\msvc-8.0\debug\test-A\threading-multi\main.obj.rsp"

main.c

file bin\msvc-8.0\debug\test-A\threading-multi\main.exe.rsp

"bin\msvc-8.0\debug\test-A\threading-multi\main.obj"
msvc.link bin\msvc-8.0\debug\test-A\threading-multi\main.exe

        call "C:\Program Files (x86)\Microsoft Visual Studio 8\VC\vcvarsall.bat" x86 >nul
link /NOLOGO /INCREMENTAL:NO /DEBUG /MACHINE:X86 /subsystem:console /out:"bin\msvc-8.0\debug\test-A\threading-multi\main.exe"   @"bin\msvc-8.0\debug\test-A\threading-multi\main.exe.rsp"
        if %ERRORLEVEL% NEQ 0 EXIT %ERRORLEVEL%

msvc.manifest bin\msvc-8.0\debug\test-A\threading-multi\main.exe

        if exist "bin\msvc-8.0\debug\test-A\threading-multi\main.exe.manifest" (
            call "C:\Program Files (x86)\Microsoft Visual Studio 8\VC\vcvarsall.bat" x86 >nul
mt -nologo -manifest "bin\msvc-8.0\debug\test-A\threading-multi\main.exe.manifest" "-outputresource:bin\msvc-8.0\debug\test-A\threading-multi\main.exe;1"
        )

...updated 3 targets...

Thanks,

Chris

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