.Dd $Mdocdate$
.Dt CPROC 1
.Os
.Sh NAME
.Nm cproc
.Nd C11 compiler
.Sh SYNOPSIS
.Nm
.Op options
.Ar sources...
.Sh DESCRIPTION
.Nm
is a C11 compiler using QBE as backend.
It supports ISO C11, some features from the upcoming C23, and some
GNU C extensions.
.Pp
When invoked without any options,
.Nm
will preprocess, compile, and link
.Ar sources...
and generate an executable
.Pa a.out
file.
.Pp
The following options are available:
.Bl -tag -width Ds
.It Fl c
Compile sources to object files rather than linking them.
.It Fl D Ar macro Ns Op = Ns Ar value
Define
.Ar macro
to
.Ar value
as if by a preprocessor
.Em #define .
If
.Ar value
is not given,
.Ar macro
is defined to 1.
.It Fl E
Preprocess the input files and print the output rather than compiling.
.It Fl I Ar path
Append
.Ar path
to the list of directories to be searched for headers.
.It Fl L Ar path
Append
.Ar path
to the list of directories to be searched for libraries.
.It Fl l Ar library
Link
.Ar library
to the executable.
If
.Ar library
is a relative path, it will be searched through the compiler search
paths.
.It Fl o Ar output
Write the output to
.Ar output .
By default, output is written to 
.Pa a.out .
Or, if
.Fl c
is used, the output file is determined by replacing the source file
extension with
.Pa .o .
Or, if
.Fl E
or
.Fl emit-qbe
is used, the output is written to standard output.
.It Fl s
Strip the symbol table from the generated executable.
.It Fl U Ar macro
Undefine a pre-defined macro.
.It Fl v
Print the commands run as part of the compile pipeline.
.It Fl x Ar format
Force
.Nm
to interpret subsequent source files as
.Ar format .
By default,
.Nm
will determine source code language from the known file extensions.
This option forces a different
.Ar format
which can be one of
.Dq none ,
.Dq c ,
.Dq c-header ,
.Dq cpp-output ,
.Dq qbe ,
.Dq assembler ,
.Dq assembler-with-cpp .
.It Fl Wa,args... , Fl Wl,args... , Fl Wp,args...
For each of these options, pass additional
.Ar args...
to the assembler, linker, or preprocessor respectively.
The list of arguments is delimited by commas.
.Pp
For example, 
.Fl Wl,--gc-sections
will forward the option
.Fl -gc-sections
to the linker.
.It Fl static
Link the executable statically.
.It Fl nostdlib
Do not use standard library and startup files when linking.
.It Fl nostdinc
Do not search default compiler include paths when compiling.
.It Fl pthread
This is a short hand of
.Fl lpthread .
.It Fl g , Fl O , Fl pipe , Fl pedantic
These options are available for compatibility with most common compilers but
are currently ineffective.
.El
.Sh AUTHORS
.Nm
was written by
.An Michael Forney Aq Mt mforney@mforney.org .