.\" -*-nroff-*-
.TH compiler 3 "26 May 2018" "Straylight/Edgeware" "mLib utilities library"
.SH NAME
compiler \- detect compiler version
.\" @GCC_VERSION_P
.\" @CLANG_VERSION_P
.SH SYNOPSIS
.nf
.B "#include <mLib/compiler.h>"

.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>