1 .\" Please adjust this date whenever revising the manpage.
9 .Op Fl c | S | E | -print-ast
10 .Op Fl -print-implicit-cast
11 .Op Fl -print-parenthesis
12 .Op Fl std= Ns Ar standard
13 .Op Fl - Ns Oo Cm no- Oc Ns Cm gcc
14 .Op Fl - Ns Oo Cm no- Oc Ns Cm ms
17 .Op Fl W Ns Oo Cm no- Oc Ns Ar warn
21 .Op Fl D Ns Ar macro Ns Op Ar =defn
24 .Op Fl finput-charset= Ns Ar encoding
29 .Op Fl Wl, Ns Ar option
30 .Op Fl Wp, Ns Ar option
34 is a C compiler, which can parse C90 and C99 as well as many GCC and some MSC extensions.
35 It also provides many useful analyses for warnings and generates concise messages in case of error.
36 It uses libFIRM for optimization and code generation.
37 The compiler driver is largely compatible with GCC.
41 Compile the input files to object files.
42 The default output filename is the input filename with the extension replaced by .o.
44 Compile the input files to assembler.
45 The default output filename is the input filename with the extension replaced by .s.
47 Preprocess the input file only.
48 By default the result is output to stdout.
50 Output the abstract syntax tree of the parsed input file as C again.
51 .It Fl -print-implicit-cast
54 show casts, which are inserted by the semantic checks.
55 .It Fl -print-parenthesis
58 show all expressions fully parenthesized.
59 .It Fl std= Ns Ar standard
60 Select the language standard.
62 .Bl -tag -compact -width "iso9899:1990"
67 ISO C90 with GCC extensions
72 ISO C99 with GCC extensions
77 ISO C++ 1998 with GCC extensions.
80 .It Fl - Ns Oo Cm no- Oc Ns Cm gcc
81 Disable/enable GCC extensions.
82 This switch supersedes
84 .It Fl - Ns Oo Cm no- Oc Ns Cm ms
85 Disable/enable MSC extensions.
87 When compiling C files, add debug information in
92 Select the optimization level.
93 Sensible values are between 0 and 4, inclusive.
94 .It Fl W Ns Oo Cm no- Oc Ns Ar warn
96 Disable/enable a specific warning.
97 Every warning option has a corresponding
99 switch to deactivate it.
101 Warn about suspicious use of addresses, like using the address of a function or variable as boolean condition or comparing with the address of a string literal.
102 .It Fl Waggregate-return
103 Warn about defining or calling a function, which returns a struct or union by value.
105 Activate most warnings.
106 In particular these are
109 .Fl Wchar-subscripts ,
111 .Fl Wempty-statement ,
113 .Fl Wimplicit-function-declaration ,
120 .Fl Wredundant-decls ,
124 .Fl Wstrict-prototypes ,
126 .Fl Wunknown-pragmas ,
127 .Fl Wunreachable-code ,
128 .Fl Wunused-function ,
130 .Fl Wunused-parameter ,
132 .Fl Wunused-variable .
134 Warn whenever a pointer cast removes qualifiers from the pointed-to type, e.g. casting a const char* to char*.
135 .It Fl Wchar-subscripts
136 Warn about using an expression of type char as array subscript, e.g. char\ c; arr[c].
137 .It Fl Wdeclaration-after-statement
138 Warn about mixing declarations and statements, which is not allowed prior to C99.
140 Warn about compile-time integer division by zero.
141 .It Fl Wempty-statement
142 Warn about empty statements, i.e. statements which only consist of a single
144 Use {} as replacement to avoid this warning.
146 Treat warnings as errors, i.e. do not continue after parsing when a warning is encountered.
147 .It Fl Werror-implicit-function-declaration
148 Generate an error, when calling a function without a prior declaration.
150 Activate some more warnings.
151 In particular these are
152 .Fl Wempty-statement ,
153 .Fl Wunused-parameter ,
156 Immediately abort compilation when encountering an error.
158 Check format strings of char and wchar_t functions.
161 .Fl Wimplicit-function-declaration ,
163 .It Fl Wimplicit-function-declaration
164 Warn about calling a function without a prior declaration.
166 Warn about declarations whose declaration specifiers do not include a type specifier.
168 Warn about uninitialized variables which are initialized with themselves.
176 is suspicious, i.e. if it is not a non-static function declared as either int\ main(void), int\ main(int,\ char**) or, as an extension, int\ main(int,\ char**,\ char**).
177 .It Fl Wmissing-declarations
178 Warn if a non-static function or a global variable without a storage class is defined without a prior declaration.
179 This is typically a sign of a missing #include or that the object should be static.
180 .It Fl Wmissing-noreturn
181 Warn about functions, which are candidates for the attribute
183 .It Fl Wmissing-prototypes
184 Warn if a global function is defined without a previous prototype declaration.
186 Warn if a multicharacter constant
189 .It Fl Wnested-externs
192 declaration is encountered within a function.
194 Warn if parentheses are omitted in certain contexts.
195 Warn if an assignment is used as condition, e.g. if\ (x\ =\ 23).
196 Warn if && without parentheses is used within ||, e.g. if\ (x\ ||\ y\ &&\ z).
197 Warn if it there may be confusion which
201 -branch belongs to, e.g. if\ (x)\ if\ (y)\ {}\ else\ {}.
202 Warn if cascaded comparisons appear which do not have their mathematical meaning, e.g. if\ (23\ <=\ x\ <\ 42).
203 Warn if + or - is used as operand of << or >>, e.g. x\ +\ y\ <<\ z.
204 .It Fl Wredundant-decls
205 Warn about redundant declarations, i.e. multiple declarations of the same object or static forward declarations which have no use before their definition.
206 .It Fl Wunreachable-code
207 Warn when the compiler determines that a statement (or in some cases a part thereof) will never be executed.
210 .Fl Wunused-function ,
212 .Fl Wunused-parameter ,
214 .Fl Wunused-variable .
215 .It Fl Wunused-parameter
216 Warn when a parameter is never used or only ever read to calculate its own new value, e.g. x\ =\ x\ +\ 1.
217 .It Fl Wunused-variable
218 Warn when a variable is never used or only ever read to calculate its own new value, e.g. x\ =\ x\ +\ 1.
220 Suppress all warnings.
224 to the paths to be searched for include files.
228 to the paths to be searched for libraries.
230 Define the preprocessor macro
232 which will expand to 1.
233 .It Fl D Ns Ar macro=defn
234 Define the preprocessor macro
236 and set its expanded value to
239 Undefine the preprocessor macro
242 Set a frontend or optimizer option.
245 to get a list of supported optimizer options.
246 .It Fl finput-charset= Ns Ar encoding
247 Select the encoding of the input.
275 to have the same range, representation and behaviour as
277 .It Fl funsigned-char
280 to have the same range, representation and behaviour as
283 Set a backend option.
286 to get a list of supported options.
288 Link with the specified library.
290 Specify the output filename.
291 This is only valid when using a single input filename.
293 as filename uses stdout for output.
295 Overwrite the language auto-detection for the following filenames by the
298 Supported values are:
299 .Bl -tag -compact -width "assembler-with-cpp"
302 .It Cm assembler-with-cpp
303 Assembler file, which needs to be preprocessed
311 Revert to auto-detection
313 .It Fl Wl, Ns Ar option
317 .It Fl Wp, Ns Ar option
324 http://www.libfirm.org/
326 Probably many - if you hit one, please report it.
329 needs to support more switches for better GCC compatibility.
331 This manual page is incomplete.
337 .Aq matze@braunis.de ,
339 .Aq christoph.mallon@gmx.de
projects / cparser / blob