.\" -*-nroff-*-
.\"
.\" Manual for compiler version checking
.\"
.\" (c) 2018, 2024 Straylight/Edgeware
.\"
.
.\"----- Licensing notice ---------------------------------------------------
.\"
.\" This file is part of the mLib utilities library.
.\"
.\" mLib is free software: you can redistribute it and/or modify it under
.\" the terms of the GNU Library General Public License as published by
.\" the Free Software Foundation; either version 2 of the License, or (at
.\" your option) any later version.
.\"
.\" mLib is distributed in the hope that it will be useful, but WITHOUT
.\" ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
.\" FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
.\" License for more details.
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.\" Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
.\" USA.
.
.\"--------------------------------------------------------------------------
.so ../defs.man \" @@@PRE@@@
.
.\"--------------------------------------------------------------------------
.TH compiler 3mLib "26 May 2018" "Straylight/Edgeware" "mLib utilities library"
.\" @GCC_VERSION_P
.\" @CLANG_VERSION_P
.
.\"--------------------------------------------------------------------------
.SH NAME
compiler \- detect compiler version
.
.\"--------------------------------------------------------------------------
.SH SYNOPSIS
.
.nf
.B "#include <mLib/compiler.h>"
.PP
.BI "int GCC_VERSION_P(" maj ", " min ");"
.BI "int CLANG_VERSION_P(" maj ", " min ");"
.fi
.
.\"--------------------------------------------------------------------------
.SH DESCRIPTION
The macro invocation
.BI GCC_VERSION_P( maj ", " min )
expands to a compile-time constant nonzero value if the present compiler
is GCC version
.IR maj . min
or better, or claims compatibility with it.
This is frequently imperfect, as many compilers claim compatibility
without implementing all of the necessary features, but it works
adequately if one takes care.
.PP
The macro invocation
.BI CLANG_VERSION_P( maj ", " min )
expands to a compile-time constant nonzero value if the present compiler
is Clang version
.IR maj . min
or better (or claims compatibility with it, but this is less likely
than for GCC.
.
.\"--------------------------------------------------------------------------
.SH "SEE ALSO"
.
.BR mLib (3).
.
.\"--------------------------------------------------------------------------
.SH "AUTHOR"
.
Mark Wooding, <mdw@distorted.org.uk>
.
.\"----- That's all, folks --------------------------------------------------