Re: -std's (was Re: v3 link failures analyzed)

[Gabriel Dos Reis <Gabriel dot Dos-Reis at cmla dot ens-cachan dot fr>]

Phil Edwards <pedwards@disaster.jaj.com> writes:

| On Sun, Dec 31, 2000 at 01:58:32PM +0100, Gabriel Dos Reis wrote:
| > Phil Edwards <pedwards@disaster.jaj.com> writes:
| > | On Sat, Dec 30, 2000 at 04:03:38PM -0600, Robert Lipe wrote:
| > | > 
| > | > It seems to me that the -ansi-ness of the testsuite invocation needs to
| > | > match that of the autoconf invocation, but I could be talked out of that.
| > | 
| > | Well, they definitely need to match if the testsuite is going to run
| > | on openserver, right?  I think we should be using -ansi/-std=c89 when
| > | configuring and building the library when possible.
| > 
| > Agreed.
| > 
| > | Hmmm... I wonder if std=c89 has any effects on C++? 
| > 
| > Just for clarity: std=c90 -- even though c89 and c90 are identical.
| 
| Well, you know that, and I know that, but the compiler doesn't:
| 
|     % gcc -std=c90 ib.c
|     cc1: unknown C standard `c90'

This must be a bug <g>.

|     cc1: unknown C standard `c90'
|     %
| 
| We could teach the compiler that c89 and c90 are identical, as you say,
| or we could just use one of the expanded forms documented in c-decl.c:
| 
|     -std=iso9899:1990      same as -ansi
|     -std=iso9899:199409    ISO C as modified in amend. 1
|     -std=iso9899:1999      ISO C 99
|     -std=c89               same as -std=iso9899:1990

The flags should reflect common usage.  C89 used to mean the american
standardised ANSI 89 and C90 used to mean ISO C 90.  The compiler
should accept -std=c90 to as a synonymous of -std=iso9899:1990.

|     -std=c99               same as -std=iso9899:1999
|     -std=gnu89             default, iso9899:1990 + gnu extensions
|     -std=gnu99             iso9899:1999 + gnu extensions
| 
| For v3 I think -std=iso9899:199409 is the closest we want.  Gaby?  Benjamin?

In an ideal world, yes, you're right.  But I have no idea of whether
the compiler understands that.

-- Gaby