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−.. -*- coding: utf-8; -*-
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−.. include:: HEADER.rst
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−
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−=======================
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− cpp (C preprocessor).
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−=======================
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−.. contents::
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−
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−How to see macros expansion?
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−============================
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−
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−GCC::
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−
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−  $ cpp <file>.c
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−
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−MSVC::
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−
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−  $ cl /E <file>.c
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−
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−Under Emacs select region and type ``C-c C-e``.
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−
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−How to see predefined macros?
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−=============================
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−
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−See:
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−
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−  http://predef.sourceforge.net/
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−                ``predef`` project on Sourceforge
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−  http://en.wikipedia.org/wiki/C_preprocessor#Compiler-specific_predefined_macros
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−                Compiler specific predefined macros
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−  http://msdn.microsoft.com/en-us/library/b0084kay.aspx
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−                Predefined Macros
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−
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−GNU C Compiler::
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−
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−  $ gcc -dM -E - < /dev/null
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−
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−HP-UX ansi C compiler::
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−
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−  $ cc -v EMPTY.c
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−
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−SCO OpenServer C compiler::
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−
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−  $ cc -## EMPTY.c
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−
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−Sun Studio C/C++ compiler::
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−
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−  $ cc -## EMPTY.c
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−
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−IBM AIX XL C/C++ compiler::
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−
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−  $ cc -qshowmacros -E EMPTY.c
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−
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−For Visual Studio compiler there no any possibility get predefined macros from
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−command line... But some macros documented:
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−
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−  _MSC_VER
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−                Defines the compiler version. Always defined.
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−  _WIN32
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−                Defined for applications for Win32. Always defined.
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−
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−