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Re: C++ PATCH: PR 20599 (1/3)


Daniel Jacobowitz <drow@false.org> writes:

| On Mon, Sep 25, 2006 at 04:32:03AM +0200, Gabriel Dos Reis wrote:
| > Under the proposed plan, we're heading experimental route in the hope
| > of luring more users into using GCC because it would be the first to
| > implement some new features.  Such features come with command-line
| > options, which triggers hard error (current GCC behaviour) when not
| > supported.  Consequently, the additional macro feature-test is
| > unnecessary bloat and distraction: if the feature is not supported,
| > the compiler would not even get the chance to get to the source code
| > that test it. 
| 
| Doesn't that miss the point?  He mentioned libraries; the library may
| want to make some c++0x-only interfaces available, if the user requests
| them, along the same lines as GCC.

you can use that library code only if GCC gets to the point of compiling it
-- which can't happen when the compiler does not understand the option.
Concretely, the feature-test is illusory unless you also change how
GCC handls unrecognized command-line options.

-- Gaby


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