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217 lines
6.2 KiB
217 lines
6.2 KiB
7 years ago
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'\" t
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.\" Title: configurator
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.\" Author: [see the "AUTHOR" section]
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.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
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.\" Date: 03/01/2018
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.\" Manual: \ \&
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.\" Source: \ \&
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.\" Language: English
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.\"
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.TH "CONFIGURATOR" "1" "03/01/2018" "\ \&" "\ \&"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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configurator \- Generate a simple config\&.h or variable file
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.SH "SYNOPSIS"
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.sp
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\fBconfigurator\fR [\fIOPTIONS\fR] [\fICC\fR] [\fICFLAGS\fR\&...]
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.SH "DESCRIPTION"
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.sp
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\fBconfigurator\fR is a standalone C program which evaluates the C environment using code snippets\&.
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.sp
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The C compiler (and flags) can be provided on the command\-line, otherwise built\-in defaults are used\&.
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.sp
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It has a builtin set of tests, to which more can be added\&. By default it produces a C header file to standard output, but it can also produce a file containing simple "key=value" lines suitable for parsing by \fBsh\fR or \fBmake\fR\&.
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.SH "OPTIONS"
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.PP
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\fB\-v\fR
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.RS 4
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Print out every test result; specified twice, print out each test too\&.
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.RE
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.PP
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\fB\-vv\fR
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.RS 4
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Shortcut for two
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\fB\-v\fR
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options\&.
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.RE
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.PP
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\fB\-\-var\-file=<file>\fR
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.RS 4
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Output results in format
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\fI<key>=<value>\fR
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to
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\fI<file>\fR, or stdout if
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\fI<file>\fR
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is
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\fI\-\fR\&. Default is not to output this\&.
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.RE
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.PP
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\fB\-\-header\-file=<file>\fR
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.RS 4
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Output C\-style header to
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\fI<file>\fR
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instead out stdout\&.
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.RE
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.PP
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\fB\-\-autotools\-style\fR
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.RS 4
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Produce output to stdout like autotools\*(Aq configure script\&. This usually means you want to use
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\fB\-\-header\-file\fR
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so that doesn\(cqt mix with stdout\&.
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.RE
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.PP
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\fB\-O<outflag>\fR
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.RS 4
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Override option to set compiler output file\&.
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.RE
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.PP
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\fB\-\-configurator\-cc=<command>\fR
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.RS 4
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This gives the real compiler command to use for tests, instead of the first commandline argument or the default\&.
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.RE
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.PP
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\fB\-\-extra\-tests\fR
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.RS 4
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Read additional tests from stdin, see
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\fIEXTRA TESTS\fR
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below\&.
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.RE
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.SH "OUTPUT"
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.sp
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The header output is \fI#ifndef/#define\fR idempotent\-wrapped using \fICCAN_CONFIG_H\fR, and defines \fI_GNU_SOURCE\fR\&. It also defines \fICCAN_COMPILER\fR, \fICCAN_CFLAGS\fR and \fICCAN_OUTPUT_EXE_CFLAG\fR as either the built\-in definitions or those provided on the command line\&. The remainder is \fI#define\fR of the test names followed by a \fI0\fR or \fI1\fR: note that this means you should use \fI#if\fR not \fI#ifdef\fR to test features in your C programs!
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.sp
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The var\-file output is simply the test names followed by \fI=1\fR or \fI=0\fR\&.
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.SH "EXTRA TESTS"
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.sp
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Extra tests must be formatted as \fI<key>=<value>\fR pairs, with leading whitespace and \fI#\fR lines ignored\&.
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.sp
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The first three lines are always the same:
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.PP
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\fBvar=<varname>\fR
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.RS 4
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Define the variable set by the test, e\&.g\&.
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\fIvar=HAVE_FOO\fR\&.
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.RE
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.PP
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\fBdesc=<description>\fR
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.RS 4
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The description printed out with
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\fB\-\-autotools\-style\fR, e\&.g\&.
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\fIfoo support\fR\&.
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.RE
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.PP
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\fBstyle=<style>\fR
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.RS 4
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The set of strings defining how to treat the code snippet\&. It must include one of
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\fIOUTSIDE_MAIN\fR,
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\fIDEFINES_FUNC\fR,
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\fIINSIDE_MAIN\fR
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or
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\fIDEFINES_EVERYTHING\fR
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which control the boilerplate to surround the file, and may include
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\fIEXECUTE\fR
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or both
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\fIEXECUTE\fR
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and
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\fIMAY_NOT_COMPILE\fR\&. e\&.g\&.
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\fIINSIDE_MAIN|EXECUTE\fR\&.
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.RE
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.sp
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The following styles are defined:
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.PP
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\fBOUTSIDE_MAIN\fR
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.RS 4
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means we put a simple boilerplate main below it\&.
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.RE
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.PP
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\fBDEFINES_FUNC\fR
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.RS 4
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put a simple boilerplate main below it, which references
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\fIfunc\fR
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(to avoid any unused warnings)\&.
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.RE
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.PP
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\fBINSIDE_MAIN\fR
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.RS 4
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put this inside main()\&. This also means it must exit with status 0 if it compiles, unless
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\fBEXECUTE\fR
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is added\&.
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.RE
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.PP
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\fBDEFINES_EVERYTHING\fR
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.RS 4
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don\(cqt add any boilerplate at all\&.
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.RE
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.PP
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\fBEXECUTE\fR
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.RS 4
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this is an execution test; it must compile, but may not exit with status 0 when run\&.
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.RE
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.PP
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\fBMAY_NOT_COMPILE\fR
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.RS 4
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Only useful with EXECUTE: don\(cqt get upset if it doesn\(cqt compile\&.
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.RE
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.sp
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The following lines are optional, and may follow in any order:
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.PP
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\fBdepends=<varnames>\fR
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.RS 4
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A space\-separates set of vars which must pass to even try to pass this one\&. If the var begins with
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\fI!\fR
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then the dependency must fail to try this one\&. e\&.g\&.
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\fIdepends=HAVE_UCONTEXT !HAVE_VALGRIND_MEMCHECK_H\fR\&.
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.RE
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.PP
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\fBlink=<linkargs>\fR
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.RS 4
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Extra arguments for linking with this test, e\&.g\&.
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\fIlink=\-lrt\fR\&.
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.RE
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.PP
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\fBflags=<cflags>\fR
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.RS 4
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Extra flags for compiling with this test, e\&.g\&.
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\fIflags=\-fopenmp\fR\&.
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.RE
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.PP
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\fBoverrides=<varname>\fR
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.RS 4
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Tests to force passing if this one passes\&. e\&.g\&.
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\fIoverrides=HAVE_SOME_FOO\fR\&.
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.RE
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.sp
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The final line is the code to test, itself, either as a single \fIcode=<oneline>\fR or as multiple lines starting with \fIcode=\fR and ending with \fI/*END*/\fR on a line by itself\&. e\&.g\&. \fIcode=return 0;\fR\&.
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.SH "EXIT STATUS"
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.sp
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It will exit with non\-zero status if it has a problem\&. \fB1\fR means bad commandline options\&. \fB2\fR means some operational problem creating and running tests\&. \fB3\fR means a bad test\&. \fB4\fR means failure to parse an extra test\&.
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.SH "AUTHOR"
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.sp
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Rusty Russell wrote \fBconfigurator\fR\&.
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.SH "RESOURCES"
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.sp
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Main web site: http://ccodearchive\&.net/
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.sp
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Wiki: https://github\&.com/rustyrussell/ccan/wiki/
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.SH "COPYING"
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.sp
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This program is under the MIT\-style BSD license; see code for details\&.
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