.SH NAME
macros \- useful macros
.\" @N
+.\" @STR
+.\" @GLUE
+.\" @DISCARD
+.\" @IGNORE
+.\" @DEPRECATED
+.\" @EXECL_LIKE
+.\" @IGNORABLE
+.\" @NORETURN
+.\" @PRINTF_LIKE
+.\" @SCANF_LIKE
+.\" @MUFFLE_WARNINGS_DECL
+.\" @MUFFLE_WARNINGS_EXPR
+.\" @MUFFLE_WARNINGS_STMT
+.\" @GCC_VERSION_P
+.\" @GCC_WARNING
.SH SYNOPSIS
.nf
.B "#include <mLib/macros.h>"
.BI "size_t N(" array ");"
+.BI "STR(" tokens\fR... ")"
+.BI "GLUE(" tokens\fR... ", " tokens\fR... ")"
+
+.BI "void DISCARD(" scalar ");"
+.BI "void IGNORE(" variable ");"
+
+.BI "DEPRECATED(" msg ")"
+.BI "EXECL_LIKE(" ntrail ")"
+.BI "IGNORABLE"
+.BI "NORETURN"
+.BI "PRINTF_LIKE(" fmt-index ", " arg-index ")"
+.BI "SCANF_LIKE(" fmt-index ", " arg-index ")"
+
+.BI "MUFFLE_WARNINGS_DECL(" warns ", " decls ")"
+.BI "MUFFLE_WARNINGS_EXPR(" warns ", " expr ")"
+.BI "MUFFLE_WARNINGS_STMT(" warns ", " stmt ")"
+
+.BI "int GCC_VERSION_P(" maj ", " min ");"
+.BI "GCC_WARNING(" option ")"
+.BI "CLANG_WARNING(" option ")"
.fi
.SH DESCRIPTION
+.SS Utilities
The
.B N
macro returns the number of elements in the named
.IR array .
+.PP
+The
+.B STR
+macro expands to a string literal containing the result of expanding its
+argument
+.IR tokens .
+.PP
+The
+.B GLUE
+macro expands to a single token, which is the result of gluing together
+the tokens resulting from expanding its argument token lists. Each of
+the argument token lists must expand to a single preprocessing token,
+and the result of gluing these tokens together must be valid
+preprocessing token.
+.PP
+The
+.B DISCARD
+macro discards its argument, which must be of some scalar type. This
+can be useful in muffling warnings about ignoring return codes in cases
+where you really don't care.
+.PP
+The
+.B IGNORE
+macro ignores its argument, which may be an expression of any type.
+This can be useful in muffling warnings about unused variables.
+.SS Annotations
+The following annotations can be attached to function declarations and
+definitions, as part of the declaration specifiers. (Other positions
+may also work, depending on your compiler, but don't bet on it.) They
+might not have any effect, depending on your specific compiler.
+Currently only GCC is well supported, but exactly which features are
+available depend on the compiler version.
+.PP
+Using a function or variable marked as
+.B DEPRECATED
+may provoke a compiler warning; this warning may (depending on your
+compiler version) include the given
+.IR msg .
+.PP
+A variadic function marked as
+.B EXECL_LIKE
+must be called with a null pointer (i.e., an integer constant
+expression with value 0, cast to
+.BR "void *")
+in the variadic part of its argument list, followed by
+.I ntrail
+further arguments. Typically,
+.I ntrail
+is zero. Compilers may warn about misuse of such functions.
+.PP
+A function or variable marked as
+.B IGNORABLE
+need not be used. This may muffle warnings about leaving the marked
+definition unused.
+.PP
+A function marked as
+.B NORETURN
+must not return. It must have return type
+.BR void .
+This may be useful in muffling warnings about uninitialized variables,
+for example.
+.PP
+A variadic function marked as
+.B PRINTF_LIKE
+takes a
+.BR printf (3)-style
+format argument (in position
+.IR fmt-index ,
+counting from 1) and a variable-length list of arguments to be formatted
+(starting from position
+.IR arg-index ).
+Compilers may warn about misuse of such functions.
+.PP
+A variadic function marked as
+.B SCANF_LIKE
+takes a
+.BR scanf (3)-style
+format argument (in position
+.IR fmt-index ,
+counting from 1) and a variable-length list of arguments to be formatted
+(starting from position
+.IR arg-index ).
+Compilers may warn about misuse of such functions.
+.SS Muffling warnings
+Some compilers allow you to muffle warnings in particular pieces of
+code. These macros provide a compiler-neutral interface to such
+facilities. Each macro takes an argument
+.IR warns ,
+which is a sequence of calls to
+.IB compiler _WARNING
+macros listing the warnings to be muffled. The list may contain
+warnings for several different compilers. The other argument is a
+.I body
+consisting of declarations (in the case of
+.BR MUFFLE_WARNINGS_DECL ),
+an expression (for
+.BR MUFFLE_WARNINGS_EXPR ),
+or a statement (for
+.BR MUFFLE_WARNINGS_STMT ).
+.SS GCC-specific features
+The
+.B GCC_VERSION_P
+macro returns a nonzero value if the compiler is at least version
+.IB maj . min
+of GCC, and zero otherwise. It's useful in preprocessor conditions.
+.PP
+The
+.B GCC_WARNING
+macro is intended to be used in
+.I warns
+lists (see above). It takes a string-literal argument
+.I option
+naming a GCC warning option, e.g.,
+.BR """\-Wdiv-by-zero""" .
+.PP
+The
+.B CLANG_WARNING
+is similar, except that it works with the Clang compiler.
.SH "SEE ALSO"
.BR mLib (3).
.SH "AUTHOR"
~mdw / mLib / blobdiff