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(C Compiler): Describe AC_C_RESTRICT.

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Jim Meyering 2003-04-12 20:53:33 +00:00
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doc/autoconf.texi
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@ -5252,6 +5252,23 @@ installers who run into trouble in this area should get a C compiler
like GCC to compile their C code.
@end defmac
@defmac AC_C_RESTRICT
@acindex C_RESTRICT
@cvindex restrict
If the C compiler recognizes the @code{restrict} keyword, don't do anything.
If it recognizes only a variant spelling (@code{__restrict},
@code{__restrict__}, or @code{_Restrict}), then define
@code{restrict} to that.
Otherwise, define @code{restrict} to be empty.
Thus, programs may simply use @code{restrict} as if every C compiler
supported it; for those that do not, the @file{Makefile}
or configuration header defines it away.
Although support in C++ for the @code{restrict} keyword is not
required, several C++ compilers do accept the keyword.
This macro works for them, too.
@end defmac
@defmac AC_C_VOLATILE
@acindex{C_VOLATILE}
@cvindex volatile