(gcc.info) Invoking GCC

 
 GCC Command Options
 *******************
 
    When you invoke GCC, it normally does preprocessing, compilation,
 assembly and linking.  The "overall options" allow you to stop this
 process at an intermediate stage.  For example, the `-c' option says
 not to run the linker.  Then the output consists of object files output
 by the assembler.
 
    Other options are passed on to one stage of processing.  Some options
 control the preprocessor and others the compiler itself.  Yet other
 options control the assembler and linker; most of these are not
 documented here, since you rarely need to use any of them.
 
    Most of the command line options that you can use with GCC are useful
 for C programs; when an option is only useful with another language
 (usually C++), the explanation says so explicitly.  If the description
 for a particular option does not mention a source language, you can use
 that option with all supported languages.
 
     Compiling C++ Programs Invoking G++, for a summary of special
 options for compiling C++ programs.
 
    The `gcc' program accepts options and file names as operands.  Many
 options have multiletter names; therefore multiple single-letter options
 may *not* be grouped: `-dr' is very different from `-d -r'.
 
    You can mix options and other arguments.  For the most part, the
 order you use doesn't matter.  Order does matter when you use several
 options of the same kind; for example, if you specify `-L' more than
 once, the directories are searched in the order specified.
 
    Many options have long names starting with `-f' or with `-W'--for
 example, `-fforce-mem', `-fstrength-reduce', `-Wformat' and so on.
 Most of these have both positive and negative forms; the negative form
 of `-ffoo' would be `-fno-foo'.  This manual documents only one of
 these two forms, whichever one is not the default.

 
* Option Summary      Brief list of all options, without explanations.
* Overall Options     Controlling the kind of output:
                         an executable, object files, assembler files,
                         or preprocessed source.
* Invoking G++        Compiling C++ programs.
* C Dialect Options   Controlling the variant of C language compiled.
* C++ Dialect Options Variations on C++.
* Warning Options     How picky should the compiler be?
* Debugging Options   Symbol tables, measurements, and debugging dumps.
* Optimize Options    How much optimization?
* Preprocessor Options Controlling header files and macro definitions.
                          Also, getting dependency information for Make.
* Assembler Options   Passing options to the assembler.
* Link Options        Specifying libraries and so on.
* Directory Options   Where to find header files and libraries.
                         Where to find the compiler executable files.
* Target Options      Running a cross-compiler, or an old version of GCC.
* Submodel Options    Specifying minor hardware or convention variations,
                         such as 68010 vs 68020.
* Code Gen Options    Specifying conventions for function calls, data layout
                         and register usage.
* Environment Variables Env vars that affect GCC.
* Running Protoize    Automatically adding or removing function prototypes.

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