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+.\"	$NetBSD: gcov.1,v 1.1 2001/08/19 14:22:24 mrg Exp $
+.\"
+.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the NetBSD
+.\"	Foundation, Inc. and its contributors.
+.\" 4. Neither the name of The NetBSD Foundation nor the names of its
+.\"    contributors may be used to endorse or promote products derived
+.\"    from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd March 13, 1999
+.Dt GCOV 1
+.Os
+.Sh NAME
+.Nm gcov
+.Nd display basic block profile / coverage data
+.Sh SYNOPSIS
+.Nm
+.Op Fl bflnv
+.Op Fl o Ar dir
+.Ar source.c
+.Sh DESCRIPTION
+The C compiler 
+.Xr gcc 1
+supports the command line options
+.Fl fprofile-arcs
+and
+.Fl ftest-coverage .
+These options cause the compiler to insert instrumentation into the
+object files it generates which measure how often each basic block is
+executed; in addition, when compiling a file named (for instance)
+.Pa source.c ,
+in addition to generating the object file
+.Pa source.o ,
+the compiler also generates
+.Pa source.bb
+and
+.Pa source.bbg ;
+these files describe the control flow graph of the program.
+.Pp
+When executed, the program will update execution counts for each
+basic block in a file 
+named 
+.Pa source.da .
+This file will be created if it doesn't exist.  If the program is run
+multiple times, the execution counts will reflect all runs of the
+program since the file was first created.
+The 
+.Xr gcov 1
+program can then be used to display the collected data in
+human-readable form.  When the command
+.Dl gcov Pa source.c
+is run, a copy of the source file with execution counts prepended to each line is
+created in 
+.Pa source.c.gcov ,
+and some summary statistics are printed to standard output.
+.Pp
+The following options are available:
+.Bl -tag -width -o-dir
+.It Fl b
+Include information about branch frequencies in the output file and
+on standard output.
+.It Fl f
+Output function-level summaries in addition to a summary for the whole
+source file.
+.It Fl l
+Create longer unambiguous names when executable code in the object
+comes from an included header file rather than the main file.
+If, for example,
+.Pa source.c
+includes one or more header files 
+.Pa header.h 
+which include instrumented code, the report for this code will be put
+in 
+.Pa source.c.header.h.gcov 
+instead of the default 
+.Pa header.h.gcov .
+.It Fl n
+Do not create output files (but still display summaries to standard
+output).
+.It Fl v
+Display the version number of
+.Xr gcov 1
+.It Fl o Ar dir
+Find 
+.Pa .bb ,
+.Pa .bbg ,
+and 
+.Pa .da
+files in the directory
+.Pa dir .
+.El
+.Sh SEE ALSO
+.Xr gcc 1 ,
+.Xr gprof 1 
+.br
+The 
+.Sq gcc
+entry in
+.Xr info 1
+.Sh HISTORY
+.Nm
+appeared in
+.Nx 1.4 .