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Implicit ‘int’ (e.g. ‘extern foo();’ meaning the same thing as
‘extern int foo();’) was dropped from the C standard in its 1999
edition. Twenty-five years later, free C compilers are finally
starting to make this an error by default, so let’s not use it
anymore in config.guess probe programs.
(Note: As of this writing, GCC 14 and Clang 16 are both more lenient
for ‘main() { … }’ specifically than for other uses of implicit int.
Still, the writing is clearly on the wall.)
We continue to use ‘int main() { … }’, instead of ‘int main(void) { … }’,
because these programs may be compiled by truly ancient compilers that
do not recognize the keyword ‘void’. This leaves open the possibility
of a compiler that errors by default on an empty argument list in a
function definition, which, prior to the 2024 C standard, is technically
still an “old-style” function definition; but we can worry about that
if and when it comes up.
Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
Co-authored-by: Zack Weinberg <zack@owlfolio.org>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
49 lines
1.7 KiB
Groff
49 lines
1.7 KiB
Groff
.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.48.5.
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.TH CONFIG.GUESS "1" "May 2024" "GNU config.guess (2024-04-03)" "User Commands"
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.SH NAME
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config.guess \- guess the build system triplet
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.SH SYNOPSIS
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.B config.guess
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[\fI\,OPTION\/\fR]
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.SH DESCRIPTION
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The GNU build system distinguishes three types of machines, the
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`build' machine on which the compilers are run, the `host' machine
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on which the package being built will run, and, exclusively when you
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build a compiler, assembler etc., the `target' machine, for which the
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compiler being built will produce code.
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This script will guess the type of the `build' machine.
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.PP
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Output the configuration name of the system 'config.guess' is run on.
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.SH OPTIONS
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.TP
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\fB\-h\fR, \fB\-\-help\fR
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print this help, then exit
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.TP
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\fB\-t\fR, \fB\-\-time\-stamp\fR
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print date of last modification, then exit
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.TP
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\fB\-v\fR, \fB\-\-version\fR
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print version number, then exit
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.SH "ENVIRONMENT VARIABLES"
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config.guess might need to compile and run C code, hence it needs a
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compiler for the `build' machine: use the environment variable
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`CC_FOR_BUILD' to specify the compiler for the build machine. If
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`CC_FOR_BUILD' is not specified, `CC' will be used. Be sure to
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specify `CC_FOR_BUILD' if `CC' is a cross-compiler to the `host'
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machine.
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CC_FOR_BUILD a native C compiler, defaults to `cc'
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CC a native C compiler, CC_FOR_BUILD is preferred
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.SH "REPORTING BUGS"
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Report bugs and patches to <config\-patches@gnu.org>.
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.PP
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.br
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Originally written by Per Bothner.
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.br
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Copyright 1992\-2024 Free Software Foundation, Inc.
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.PP
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.br
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This is free software; see the source for copying conditions. There is NO
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warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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