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diff --git a/doc/man/scons.1 b/doc/man/scons.1 index 47e2141..34cbcd4 100644 --- a/doc/man/scons.1 +++ b/doc/man/scons.1 @@ -902,6 +902,19 @@ A synonym for the .B StaticObject builder. +.IP PCH +Builds a Microsoft Visual C++ precompiled header. Calling this builder +returns a list of two targets: the PCH as the first element, and the object +file as the second element. Normally the object file is ignored. This builder is only +provided when Microsoft Visual C++ is being used as the compiler. +The PCH builder is generally used in +conjuction with the PCH construction variable to force object files to use +the precompiled header: + +.ES +env['PCH'] = env.PCH('StdAfx.cpp')[0] +.EE + .IP Program Builds an executable given one or more object files or C, C++ or Fortran source files. @@ -1787,6 +1800,47 @@ The prefix used for (static) object file names. .IP OBJSUFFIX The suffix used for (static) object file names. +.IP PCH +The Microsoft Visual C++ precompiled header that will be used when compiling +object files. This variable is ignored by tools other than Microsoft Visual C++. +When this variable is +defined SCons will add options to the compiler command line to +cause it to use the precompiled header, and will also set up the +dependencies for the PCH file. This variable must reference a File instance created either +with File() or returned by the PCH builder: + +.ES +env['PCH'] = env.PCH('StdAfx.cpp')[0] +.EE + +.IP PCHSTOP +This variable specifies how much of a source file is precompiled. This +variable is ignored by tools other than Microsoft Visual C++, or when +the PCH variable is not being used. When this variable is define it +must be a string that is the name of the header that +is included at the end of the precompiled portion of the source files, or +the empty string if the "#pragma hrdstop" construct is being used: + +.ES +env['PCHSTOP'] = File('StdAfx.h') +.EE + + + +.IP PDB +The Microsoft Visual C++ PDB file that will store debugging information for +object files, shared libraries, and programs. This variable is ignored by +tools other than Microsoft Visual C++. +When this variable is +defined SCons will add options to the compiler and linker command line to +cause them to generate external debugging information, and will also set up the +dependencies for the PDB file. This variable must reference +a File instance created with File(): + +.ES +env['PDB'] = File('hello.pdb') +.EE + .IP PDFCOM The command line used to convert TeX DVI files into a PDF file. @@ -3202,6 +3256,72 @@ CC: The C compiler. .EE +.SS Using Microsoft Visual C++ precompiled headers + +Since windows.h includes everything and the kitchen sink, it can take quite +some time to compile it over and over again for a bunch of object files, so +Microsoft provides a mechanism to compile a set of headers once and then +include the previously compiled headers in any object file. This +technology is called precompiled headers. The general recipe is to create a +file named "StdAfx.cpp" that includes a single header named "StdAfx.h", and +then include every header you want to precompile in "StdAfx.h", and finally +include "StdAfx.h" as the first header in all the source files you are +compiling to object files. For example: + +StdAfx.h: +.ES +#include <windows.h> +#include <my_big_header.h> +.EE + +StdAfx.cpp: +.ES +#include <StdAfx.h> +.EE + +Foo.cpp: +.ES +#include <StdAfx.h> + +/* do some stuff */ +.EE + +Bar.cpp: +.ES +#include <StdAfx.h> + +/* do some other stuff */ +.EE + +SConstruct: +.ES +env=Environment() +env['PCHSTOP'] = File('StdAfx.h') +env['PCH'] = env.PCH('StdAfx.cpp')[0] +env.Program('MyApp', ['Foo.cpp', 'Bar.cpp']) +.EE + +For more information see the document for the PCH builder, and the PCH and +PCHSTOP construction variables. To learn about the details of precompiled +headers consult the MSDN documention for /Yc, /Yu, and /Yp. + +.SS Using Microsoft Visual C++ external debugging information + +Since including debugging information in programs and shared libraries can +cause their size to increase significantly, Microsoft provides a mechanism +for including the debugging information in an external file called a PDB +file. SCons supports PDB files through the PDB construction +variable. + +SConstruct: +.ES +env=Environment() +env['PDB'] = File('MyApp.pdb') +env.Program('MyApp', ['Foo.cpp', 'Bar.cpp']) +.EE + +For more information see the document for the PDB construction variable. + .SH ENVIRONMENT .IP SCONS_LIB_DIR |