Gnu c preprocessor manual

The C preprocessor implements the macro language used to transform C, C++, and Objective-C programs before they are compiled. It can also be useful on its own. • Overview: • Header Files: You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development. C preprocessors vary in some details. This manual discusses the GNU C preprocessor, the C Compatible Compiler Preprocessor. The GNU C preprocessor provides a superset of the features of ANSI Standard C. ANSI Standard C requires the rejection of many harmless constructs commonly used by today's C programs. The preprocessor macros "__GNUC_GNU_INLINE__" and "__GNUC_STDC_INLINE__" may be used to check which semantics are in effect for "inline" functions. This manual does not describe the Objective-C and Objective-C++ languages themselves. This section describes the command-line options that are only meaningful for Objective-C and Objective-C++.

Run the preprocessor of the current language (see Language Choice) on the input, run the shell commands action-if-true on success, action-if-false otherwise. The input can be made by AC_LANG_PROGRAM and friends. This macro uses CPPFLAGS, but not CFLAGS, because -g, -O, etc. are not valid options to many C preprocessors. normally described in a C language manual, the GNU C preprocessor has been thoroughly documented in The C Preprocessor, a separate manual which covers preprocessing for C, C++, and Objective-C programs, so it is not included here. Credits Thanks to everyone who has helped with editing, proofreading, ideas, typesetting, and. This brief manual documents the internals of cpplib, and explains some of the tricky issues. It is intended that, along with the comments in the source code, a reasonably competent C programmer should be able to figure out what the code is doing, and why things have been implemented the way they have.

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