NAME

       ucpp - C preprocessor

SYNOPSIS

       ucpp [ options ] [ file ]

DESCRIPTION

       ucpp  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 behaviour.

       -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 characters hold the same syntactic value
              than the corresponding Universal 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 dependencies.

       -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.

ENVIRONMENT

       ucpp 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>

BUGS

       ucpp  is considered stable software. However improbable it is, please report bugs to the author (possibly
       with a file that exhibits the problem) if the latest version, available from this site:

       http://pornin.nerim.net/ucpp/

       has the bug.

                                                   Oct 21 2000                                           UCPP(1)