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