UCPP(1)UCPP(1)NAMEucpp - C preprocessor
SYNOPSISucpp [ options ] [ file ]
DESCRIPTIONucpp is a C preprocessor mostly compatible with ISO-C99. It is rather
strict and uses only a small amount of memory. It uses standard input
as primary input if no file argument is given.
OPTIONS
There are several classes of options.
Language Options
-C keep comments in the output.
-s if a rogue '#' is encountered, do not emit an error and keep it
in the output.
-l supress the emission of '#line' directives in the output.
-lg convert the '#line' to the gcc-style equivalent.
-CC disable C++-like comments (a '//' begins a comment, up to the
end of the line). Use this option to get closer to C90 behav‐
iour.
-a, -na
handle assertions (defined with #assert); -a also defines the
standard assertions #machine , #cpu and #system (see -e to get
the local definition of such assertions).
-a0 disable assertion support.
-V disable support for macros with a variable number of arguments:
in C99, a macro may be declared with ... as the last argument;
inside the replacement list, __VA_ARGS__ is replaced with the
optional extra arguments given in the call to the macro. Use
this option to get closer to C90 behaviour.
-u enable UTF-8 support: with this option, the source is considered
as an ISO/10646 source, encoded in UTF-8. Characters represented
as two bytes or more are considered as alphabetic characters,
like letters, and therefore usable in identifiers. These charac‐
ters hold the same syntactic value than the corresponding Uni‐
versal Character Names.
-X enable -a, -u and -Y. This should make ucpp behave closer to
what is requested from a "modern" C preprocessor.
-c90 enable -V and -CC, and do not define __STDC_VERSION__. This
should make ucpp mimic older C90 behaviour.
-t disable trigraph support; this seems to be required for some
legacy code.
Warning Options
-wt emit a final warning when trigraphs are encountered.
-wtt emit warnings for each trigraph encountered.
-wa emit annoying warnings (these are usually useless).
-w0 supress standard warnings.
Directory Options
-Idirectory
-I directory
add directory to the include path, before the standard include
path.
-Jdirectory
-J directory
add directory to the include path, after the standard include
path.
-zI do not use the standard (compile-time) include path.
-M emit only the names of encountered files, separated by spaces;
this is intended for automatic generation of Makefile dependen‐
cies.
-Ma do the same as -M but also for system files.
-o file
direct the ouput to file instead of standard output.
Macro Options
-Dmacro
predefine macro with content 1.
-Dmacro=def
predefine macro with the content def.
-Umacro
undefine macro.
-Y predefine system-dependant macros.
-Z do not predefine special macros such as __TIME__.
-Afoo(bar)
add foo(bar) to the list of assertions.
-Bfoo(bar)
remove foo(bar) of the list of assertions; you may also use
-Bfoo to remove all -Bfoo(xxx) from the list of assertions.
-d instead of normal output, emit '#define' directives representing
all macros defined during processing.
-e instead of normal output, emit '#assert' directives representing
all assertions defined during processing.
Miscellaneous Options
-v print version number, include path and (optionaly) defined
assertions.
-h print some help.
ENVIRONMENTucpp is not itself affected by environment variables. However, it uses
library functions that might be affected, depending on the system.
AUTHOR
Thomas Pornin <pornin@bolet.org>
BUGSucpp is considered stable software. However improbable it is, please
report bugs to the author (possibly with a file that exhibits the prob‐
lem) if the latest version, available from this site:
http://pornin.nerim.net/ucpp/
has the bug.
Oct 21 2000 UCPP(1)
