[Boost-build] Sources order changed in actions

Subject: [Boost-build] Sources order changed in actions
From: Nogradi, Chris (Chris.Nogradi_at_[hidden])
Date: 2013-08-19 13:27:20

When I upgrade our boost-build version to the latest svn commit (85183), I noticed that the order of sources provided to actions has undergone a subtle change.  Previously, if a target called out its sources in a particular order, that order was preserved in the final action performed.  However, a change was mode which no longer preserves the order when non-file targets are used.  What happens is that the following:

alias B : file1.lib ;
alias A : file2.lib ;

lib test : A B ;

used to produce:

file bin\msvc-11.0\debug\test.dll.rsp

"file2.lib"
"file1.lib"
msvc.link.dll bin\msvc-11.0\debug\test.dll

        call "C:\Program Files (x86)\microsoft visual studio 11.0\vc\vcvarsall.bat" x86 >nul
link /NOLOGO /INCREMENTAL:NO /DLL /DEBUG /MACHINE:X86 /subsystem:console /out:"bin\msvc-11.0\debug\test.dll" /IMPLIB:"bin\msvc-11.0\debug\test.lib"    @"bin\msvc-11.0\debug\test.dll.rsp"
        if %ERRORLEVEL% NEQ 0 EXIT %ERRORLEVEL%

but now it produces:

file bin\msvc-11.0\debug\test.dll.rsp

"file1.lib"
"file2.lib"
msvc.link.dll bin\msvc-11.0\debug\test.dll

        call "C:\Program Files (x86)\microsoft visual studio 11.0\vc\vcvarsall.bat" x86 >nul
link /NOLOGO /INCREMENTAL:NO /DLL /DEBUG /MACHINE:X86 /subsystem:console /out:"bin\msvc-11.0\debug\test.dll" /IMPLIB:"bin\msvc-11.0\debug\test.lib"    @"bin\msvc-11.0\debug\test.dll.rsp"
        if %ERRORLEVEL% NEQ 0 EXIT %ERRORLEVEL%

I did a git bisect to find the change that introduced the problem:

9b556de4a64f574831d18df54f1e70c3da544fc1 is the first bad commit
commit 9b556de4a64f574831d18df54f1e70c3da544fc1
Author: steven_watanabe <steven_watanabe_at_b8fc166d-592f-0410-95f2-cb63ce0dd405>
Date:   Tue Apr 16 18:40:52 2013 +0000

    Tiny optimization of generator.convert-multiple-sources-to-consumable-types.

    git-svn-id: http://svn.boost.org/svn/boost/trunk/tools/build@83930 b8fc166d-592f-0410-95f2-cb63ce0dd405

:040000 040000 6c02ac0752f150f5c2aa850a9597125bbc3b4979 0b9c031d8fce3ec3b50b62fc 269c0da4ea2311cb M      v2

Can this be fixed and the original behavior maintained? This problem is an issue with many of my generators that assume the order will be maintained.

Thanks,

Chris

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