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Written by Oleksandr Gavenko (AKA gavenkoa), compiled at 2015-10-05
from rev 764bb173578d
.
cpp (C preprocessor).¶
How to see macros expansion?¶
GCC:
$ cpp <file>.c
MSVC:
$ cl /E <file>.c
Under Emacs select region and type C-c C-e
.
How to see predefined macros?¶
See:
- http://predef.sourceforge.net/
predef
project on Sourceforge- http://en.wikipedia.org/wiki/C_preprocessor#Compiler-specific_predefined_macros
- Compiler specific predefined macros
- http://msdn.microsoft.com/en-us/library/b0084kay.aspx
- Predefined Macros
GNU C Compiler:
$ gcc -dM -E - < /dev/null
HP-UX ansi C compiler:
$ cc -v EMPTY.c
SCO OpenServer C compiler:
$ cc -## EMPTY.c
Sun Studio C/C++ compiler:
$ cc -## EMPTY.c
IBM AIX XL C/C++ compiler:
$ cc -qshowmacros -E EMPTY.c
For Visual Studio compiler there no any possibility get predefined macros from command line... But some macros documented:
- _MSC_VER
- Defines the compiler version. Always defined.
- _WIN32
- Defined for applications for Win32. Always defined.