Re: [Boost-build] [BBv2] Pre-compiled header (PCH) support

From: Alex Besogonov (cyberax_at_[hidden])
Date: 2005-11-18 02:01:37

Reece Dunn wrote:
> This is a minor revision to correctly use :W where it is needed 
> (including some places in the previous response file changeover).
I've just found another problem (minimal project attached). The problem 
is that *stupid* MSVC compiler thinks that the name given in /Yc or /Yu 
directive must be _exactly_ the same as the first #include statement.

For example, if I have /Yc"..\subproject\stdafx.hpp" then VC will expect 
  '#include "..\subproject\stdafx.hpp"' statement in stdafx.cpp and 
other files.

Here is a quick hack that fixes it:
=======================
actions compile.c bind PCH_HEADER PCH_FILE
{
     $(.CC) /Zm800 -nologo -TC -U$(UNDEFS) $(CFLAGS) $(USER_CFLAGS) 
@"@($(<[1]:W).rsp:E=$(nl)"$(>:W)" $(nl)-D$(DEFINES) 
$(nl)"-I$(INCLUDES)")" -c -Fo"$(<[1]:W)" -Yu"$(PCH_HEADER:D=)" 
-Fp"$(PCH_FILE:W)"
}
actions compile.c++ bind PCH_HEADER PCH_FILE
{
     $(.CC) /Zm800 -nologo -TP -U$(UNDEFS) $(CFLAGS) $(C++FLAGS) 
$(USER_CFLAGS) @"@($(<[1]:W).rsp:E=$(nl)"$(>:W)" $(nl)-D$(DEFINES) 
$(nl)"-I$(INCLUDES)")" -c -Fo"$(<[1]:W)" -Yu"$(PCH_HEADER:D=)" 
-Fp"$(PCH_FILE:W)"
}
actions compile.pch bind PCH_SOURCE
{
     $(.CC) /Zm800 -nologo -TP -U$(UNDEFS) $(CFLAGS) $(C++FLAGS) 
$(USER_CFLAGS) @"@($(<[1]:W).rsp:E=$(nl)"$(PCH_SOURCE:W)" 
$(nl)-D$(DEFINES) $(nl)"-I$(INCLUDES)")" -c -Fo"$(<[1]:W)" 
/Yc"$(>[1]:D=)" -Fp"$(<[2]:W)"
}
=======================
Of course, that means that the directory with the precompiled header 
must be in the include path (though that usually is not a problem).

-- 
With respect,
             Alex Besogonov (cyberax_at_[hidden])
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